Fluid Mechanics (FM) Solved MCQs
Here are 1000 Fluid Mechanics MCQ (Chapterwise). Get Fluid Mechanics Multiple Choice Questions (MCQ Quiz) with answers and detailed solutions,
| 1. | The velocity corresponding to Reynold number of 2000 is called |
| A. | Sub-sonic velocity |
| B. | Super-sonic velocity |
| C. | Lower critical velocity |
| D. | Higher critical velocity |
| Answer» C. Lower critical velocity | |
| 2. | The loss of head at entrance in a pipe is (where v = Velocity of liquid in the pipe) |
| A. | v²/2g |
| B. | 0.5v²/2g |
| C. | 0.375v²/2g |
| D. | 0.75v²/2g |
| Answer» B. 0.5v²/2g | |
| 3. | Which of the following is an example of laminar flow? |
| A. | Underground flow |
| B. | Flow past tiny bodies |
| C. | Flow of oil in measuring instruments |
| D. | All of these |
| Answer» D. All of these | |
| 4. | The discharge over a rectangular weir, considering the velocity of approach, is (whereH1 = H + Ha = Total height of water above the weir, H = Height of water over the crest of the weir, and Ha = Height of water due to velocity of approach) |
| A. | (2/3) Cd × L.√2g [H1 – Ha] |
| B. | (2/3) Cd × L. √2g [H13/2 – Ha3/2] |
| C. | (2/3) Cd × L.√2g [H12 – Ha2] |
| D. | (2/3) Cd × L. √2g [H15/2 – Ha5/2] |
| Answer» B. (2/3) Cd × L. √2g [H13/2 – Ha3/2] | |
| 5. | The maximum efficiency of transmission through a pipe is |
| A. | 50 % |
| B. | 56.7 % |
| C. | 66.67 % |
| D. | 76.66 % |
| Answer» C. 66.67 % | |
| 6. | The efficiency of power transmission through pipe is (where H = Total supply head, and hf = Head lost due to friction in the pipe) |
| A. | (H – hf )/H |
| B. | H/(H – hf ) |
| C. | (H + hf )/H |
| D. | H/(H + hf ) |
| Answer» A. (H – hf )/H | |
| 7. | The hydraulic mean depth or the hydraulic radius is the ratio of |
| A. | Area of flow and wetted perimeter |
| B. | Wetted perimeter and diameter of pipe |
| C. | Velocity of flow and area of flow |
| D. | None of these |
| Answer» A. Area of flow and wetted perimeter | |
| 8. | The hydraulic mean depth for a circular pipe of diameter (d) is |
| A. | d/6 |
| B. | d/4 |
| C. | d/2 |
| D. | d |
| Answer» B. d/4 | |
| 9. | A flow in which each liquid particle has a definite path, and the paths of individual particles do not cross each other, is called |
| A. | Steady flow |
| B. | Uniform flow |
| C. | Streamline flow |
| D. | Turbulent flow |
| Answer» C. Streamline flow | |
| 10. | The Reynold’s number of a ship is __________ to its velocity and length. |
| A. | Directly proportional |
| B. | Inversely proportional |
| C. | Square root of velocity |
| D. | None of these |
| Answer» A. Directly proportional | |
| 11. | The velocity at which the laminar flow stops, is known as |
| A. | Velocity of approach |
| B. | Lower critical velocity |
| C. | Higher critical velocity |
| D. | None of these |
| Answer» B. Lower critical velocity | |
| 12. | The velocity corresponding to Reynold number of 2800, is called |
| A. | Sub-sonic velocity |
| B. | Super-sonic velocity |
| C. | Lower critical velocity |
| D. | Higher critical velocity |
| Answer» D. Higher critical velocity | |
| 13. | The total energy of a liquid particle in motion is equal to |
| A. | Pressure energy + kinetic energy + potential energy |
| B. | Pressure energy – (kinetic energy + potential energy) |
| C. | Potential energy – (pressure energy + kinetic energy |
| D. | Kinetic energy – (pressure energy + potential energy) |
| Answer» A. Pressure energy + kinetic energy + potential energy | |
| 14. | When a cylindrical vessel containing liquid is revolved about its vertical axis at a constant angular velocity, the pressure |
| A. | Varies as the square of the radial distance |
| B. | Increases linearly as its radial distance |
| C. | Increases as the square of the radial distance |
| D. | Decreases as the square of the radial distance |
| Answer» A. Varies as the square of the radial distance | |
| 15. | The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly contracted to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden contraction, assuming coefficient of contraction as 0.62, is |
| A. | v₁²/2g |
| B. | v₂²/2g |
| C. | 0.5 v₁²/2g |
| D. | 0.375 v₂²/2g |
| Answer» D. 0.375 v₂²/2g | |
| 16. | A large Reynold number is indication of |
| A. | Smooth and streamline flow |
| B. | Laminar flow |
| C. | Steady flow |
| D. | Highly turbulent flow |
| Answer» D. Highly turbulent flow | |
| 17. | A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to empty the tank completely will be |
| A. | (2A√H₁)/(Cd × a√2g) |
| B. | (2AH₁)/(Cd × a√2g) |
| C. | (2AH₁3/2)/(Cd × a√2g) |
| D. | (2AH₁²)/(Cd × a√2g) |
| Answer» A. (2A√H₁)/(Cd × a√2g) | |
| 18. | The total pressure on the top of a closed cylindrical vessel completely filled up with a liquid is |
| A. | Directly proportional to (radius)2 |
| B. | Inversely proportional to (radius)2 |
| C. | Directly proportional to (radius)4 |
| D. | Inversely proportional to (radius)4 |
| Answer» C. Directly proportional to (radius)4 | |
| 19. | For pipes, turbulent flow occurs when Reynolds number is |
| A. | Less than 2000 |
| B. | Between 2000 and 4000 |
| C. | More than 4000 |
| D. | Less than 4000 |
| Answer» C. More than 4000 | |
| 20. | The discharge through a siphon spillway is |
| A. | Cd × a × √(2gH) |
| B. | Cd × a × √(2g) × H3/2 |
| C. | Cd × a × √(2g) × H2 |
| D. | Cd × a × √(2g) × H5/2 |
| Answer» A. Cd × a × √(2gH) | |
| 21. | The shear stress-strain graph for a Newtonian fluid is a |
| A. | Straight line |
| B. | Parabolic curve |
| C. | Hyperbolic curve |
| D. | Elliptical |
| Answer» A. Straight line | |
| 22. | When a cylindrical vessel of radius (r) containing liquid is revolved about its vertical axis ω rad/s, then depth of parabola which the liquid assumes is |
| A. | ω.r/2g |
| B. | ω².r²/2g |
| C. | ω.r/4g |
| D. | ω².r²/4g |
| Answer» B. ω².r²/2g | |
| 23. | The region between the separation streamline and the boundary surface of the solid body is known as |
| A. | Wake |
| B. | Drag |
| C. | Lift |
| D. | Boundary layer |
| Answer» A. Wake | |
| 24. | The total pressure on the top of a closed cylindrical vessel of radius (r) completely filled up with liquid of specific weight (w) and rotating at (ω) rad/s about its vertical axis, is |
| A. | π w ω² r²/4g |
| B. | π w ω² r³/4g |
| C. | π w ω² r⁴/4g |
| D. | π w ω² r²/2g |
| Answer» C. π w ω² r⁴/4g | |
| 25. | The diameter of the nozzle (d) for maximum transmission of power is given by (where D = Diameter of pipe, f = Darcy’s coefficient of friction for pipe, and l = Length of pipe) |
| A. | d = (D⁵/8fl)1/2 |
| B. | d = (D⁵/8fl)1/3 |
| C. | d = (D⁵/8fl)1/4 |
| D. | d = (D⁵/8fl)1/5 |
| Answer» C. d = (D⁵/8fl)1/4 | |
| 26. | The fluid forces considered in the Navier Stokes equation are |
| A. | Gravity, pressure and viscous |
| B. | Gravity, pressure and turbulent |
| C. | Pressure, viscous and turbulent |
| D. | Gravity, viscous and turbulent |
| Answer» A. Gravity, pressure and viscous | |
| 27. | Select the wrong statement |
| A. | An equivalent pipe is treated as an ordinary pipe for all calculations |
| B. | The length of an equivalent pipe is equal to that of a compound pipe |
| C. | The discharge through an equivalent pipe is equal to that of a compound pipe |
| D. | The diameter of an equivalent pipe is equal to that of a compound pipe |
| Answer» D. The diameter of an equivalent pipe is equal to that of a compound pipe | |
| 28. | A flow through a long pipe at constant rate is called |
| A. | Steady uniform flow |
| B. | Steady non-uniform flow |
| C. | Unsteady uniform flow |
| D. | Unsteady non-uniform flow |
| Answer» A. Steady uniform flow | |
| 29. | The velocity at which the flow changes from laminar flow to turbulent flow is called |
| A. | Critical velocity |
| B. | Velocity of approach |
| C. | Sub-sonic velocity |
| D. | Super-sonic velocity |
| Answer» A. Critical velocity | |
| 30. | According to Darcy’s formula, the loss of head due to friction in the pipe is (where f = Darcy’s coefficient, l = Length of pipe, v = Velocity of liquid in pipe, and d = Diameter of pipe) |
| A. | flv²/2gd |
| B. | flv²/gd |
| C. | 3flv²/2gd |
| D. | 4flv²/2gd |
| Answer» D. 4flv²/2gd | |
| 31. | The loss of head due to viscosity for laminar flow in pipes is (where d = Diameter of pipe, l = Length of pipe, v = Velocity of the liquid in the pipe, μ = Viscosity of the liquid, and w = Specific weight of the flowing liquid) |
| A. | 4μvl/wd² |
| B. | 8μvl/wd² |
| C. | 16μvl/wd² |
| D. | 32μvl/wd² |
| Answer» D. 32μvl/wd² | |
| 32. | The loss of pressure head in case of laminar flow is proportional to |
| A. | Velocity |
| B. | (Velocity)2 |
| C. | (Velocity)3 |
| D. | (Velocity)4 |
| Answer» A. Velocity | |
| 33. | During the opening of a valve in a pipe line, the flow is |
| A. | Steady |
| B. | Unsteady |
| C. | Uniform |
| D. | Laminar |
| Answer» B. Unsteady | |
| 34. | The main property that affects a boundary layer is__________ |
| A. | Temperature |
| B. | Pressure |
| C. | Viscosity |
| D. | Surface tension |
| Answer» C. Viscosity | |
| Explanation: A boundary layer is an important concept that refers to the layer of fluid. The fluid that is in the immediate vicinity of a bounding surface. The main property that affects a boundary layer is viscosity. | |
| 35. | The layer that is influenced by a planetary boundary is called______ |
| A. | Atmospheric boundary layer |
| B. | Lithosphere |
| C. | Troposphere |
| D. | Hydrosphere |
| Answer» A. Atmospheric boundary layer | |
| Explanation: The planetary boundary layer is also called as atmospheric boundary layer(ABL). It is the lowest part of the atmosphere. The behaviour of ABL is directly influenced by its contact with the planetary surface. | |
| 36. | What is the other name for Stoke’s boundary layer? |
| A. | Momentum boundary layer |
| B. | Atmospheric boundary layer |
| C. | Oscillatory boundary layer |
| D. | Thermal boundary layer |
| Answer» C. Oscillatory boundary layer | |
| Explanation: Stoke’s boundary layer is also called as Oscillatory boundary layer. It is a boundary layer that is close to a solid wall. It moves in an oscillatory motion. It arrested by a viscous force acting in the opposite direction. | |
| 37. | Eddy viscosity is a turbulent transfer of_________ |
| A. | Fluid |
| B. | Heat |
| C. | Momentum |
| D. | Pressure |
| Answer» C. Momentum | |
| Explanation: Eddy viscosity is a turbulent transfer of momentum by eddies. It gives rise to an internal fluid friction. It is in analogous to the action of molecular viscosity in laminar fluid flow. Eddy viscosity takes place on a large scale. | |
| 38. | The laminar boundary layer is a _________ |
| A. | Smooth flow |
| B. | Rough flow |
| C. | Uniform flow |
| D. | Random flow |
| Answer» A. Smooth flow | |
| Explanation: For a laminar boundary layer the fluid moves in a very smooth flow. The laminar flow creates less skin friction drag. It is a less stable flow. The laminar boundary layer has got an increase in its thickness. | |
| 39. | The turbulent boundary layer is a _________ |
| A. | Non-uniform with swirls |
| B. | Uniform |
| C. | Less stable |
| D. | Smooth |
| Answer» A. Non-uniform with swirls | |
| Explanation: For a turbulent boundary layer the fluid moves in different direction producing swirls. It has more skin friction drag than that of laminar boundary layer. It is more stable when compared to laminar. | |
| 40. | How do we measure the flow rate of liquid? |
| A. | Coriolis method |
| B. | Dead weight method |
| C. | Conveyor method |
| D. | Ionization method |
| Answer» A. Coriolis method | |
| Explanation: Coriolis concept of measurement of fluid takes place through the rotation with the reference frame. It is an application of the Newton’s Law. The device continuously records, regulates and feeds large volume of bulk materials. | |
| 41. | How does a turbulent boundary layer produce swirls? |
| A. | Due to random motion |
| B. | Collision of molecules |
| C. | Due to eddies |
| D. | Due to non-uniform cross section |
| Answer» C. Due to eddies | |
| Explanation: For a turbulent boundary layer the fluid moves in different direction producing swirls. It produces swirls due to the presence of eddies. The smooth laminar boundary layer flow breaks down and transforms to a turbulent flow. | |
| 42. | Define Viscosity. |
| A. | Resistance to flow of object |
| B. | Resistance to flow of air |
| C. | Resistance to flow of fluid |
| D. | Resistance to flow of heat |
| Answer» C. Resistance to flow of fluid | |
| Explanation: Viscosity is developed due to the relative motion between two surfaces of fluids at different velocities. It happens due to the shear stress developed on the surface of the fluid. | |
| 43. | How can we determine whether the flow is laminar or turbulent? |
| A. | Reynold’s number |
| B. | Mach number |
| C. | Froude number |
| D. | Knudsen number |
| Answer» A. Reynold’s number | |
| Explanation: Reynold’s number is used to determine whether the flow is laminar or turbulent. If Reynold’s number is less than 2000, it is a laminar flow. If Reynold’s number is greater than 2000, then it is a turbulent flow. | |
| 44. | The flow separation occurs when the fluid travels away from the __________ |
| A. | Surface |
| B. | Fluid body |
| C. | Adverse pressure gradient |
| D. | Inter-molecular spaces |
| Answer» C. Adverse pressure gradient | |
| Explanation: Adverse pressure gradient takes place when the static pressure increases. It increases the direction of the flow. Adverse pressure gradient plays an important role in flow separation. Thus, option c is correct. | |
| 45. | The swirl caused due to eddies are called as ______ |
| A. | Vortices |
| B. | Vertices |
| C. | Volume |
| D. | Velocity |
| Answer» A. Vortices | |
| Explanation: Vortices are a region in a fluid. It takes place when the flow revolves around an axis line. Vortices can be straight or curved. They form shapes like smoke rings and whirlpools. | |
| 46. | Which among the following is a device that converts a laminar flow into a turbulent flow? |
| A. | Dead Weight Gauge |
| B. | Vacuum Gauge |
| C. | Turbulator |
| D. | Ionization Gauge |
| Answer» C. Turbulator | |
| Explanation: Turbulator is a device that converts a laminar flow into a turbulent flow. The turbulent flow can be desired parts of an aircraft or also in industrial applications. Turbulator is derived from the word “turbulent”. | |
| 47. | With the boundary layer separation, displacement thickness________ |
| A. | Increases |
| B. | Decreases |
| C. | Remains Same |
| D. | Independent |
| Answer» A. Increases | |
| Explanation: With the boundary layer separation, displacement thickness increases sharply. This helps to modify the outside potential flow and its pressure field. Thus, option ‘a’ is the correct choice. | |
| 48. | What is the instrument used for the automatic control scheme during the fluid flow? |
| A. | Rotameters |
| B. | Pulley plates |
| C. | Rotary Piston |
| D. | Pilot Static Tube |
| Answer» D. Pilot Static Tube | |
| Explanation: Pilot static tube is a system that uses an automatic control scheme to detect pressure. It has several holes connected to one side of the device. These outside holes are called as a pressure transducer, which controls the automatic scheme during fluid flow. | |
| 49. | What is D’Alembert’s Paradox? |
| A. | Resistance= 0 |
| B. | Drag force= 0 |
| C. | Temperature = 0 |
| D. | Pressure gradient= 0 |
| Answer» B. Drag force= 0 | |
| Explanation: D’Alembert’s Paradox states that for an incompressible and inviscid flow potential flow, the drag force is equal to zero. The fluid is moving at a constant velocity with respect to its relative fluid. | |
| 50. | The steady- state flow must satisfy ___________ |
| A. | Kirchhoff’s law |
| B. | Newtons law |
| C. | Rutherford’s experiment |
| D. | Kepler’s law |
| Answer» A. Kirchhoff’s law | |
| Explanation: The steady state flow must satisfy Kirchhoff’s first and second law. The first law states that the total flow into the junction equals the total flow away from the junction. Second law is called as the law of conservation of mass. It states that between two junctions, the head loss is independent of the path followed | |
| 51. | What is the name of the equation? Q = (πΔPr4) / (8μL) |
| A. | Darcey equation |
| B. | Poiseuille law |
| C. | Reynolds equation |
| D. | Sherwood law |
| Answer» B. Poiseuille law | |
| Explanation: The Hagen–Poiseuille equation also called as the Hagen–Poiseuille law, is a physical law that gives the pressure drop in an incompressible and Newtonian fluid which is flowing through a long cylindrical pipe in laminar flow of constant cross section. | |
| 52. | What is the name of the equation? h = (fvL) / (2Dg) |
| A. | Darcey equation |
| B. | Poiseuille law |
| C. | Reynolds equation |
| D. | Sherwood law |
| Answer» A. Darcey equation | |
| Explanation: It’s a constitutive equation that describes the flow of a fluid through a porous medium. It’s based on the results of experiments on the flow of H2O through beds of sand, forming the basis of hydrogeology, a branch of earth sciences. | |
| 53. | Which one of the following is a major loss? |
| A. | frictional loss |
| B. | shock loss |
| C. | entry loss |
| D. | exit loss View Answer |
| Answer» A. frictional loss | |
| 54. | Which property of the fluid accounts for the major losses in pipes? |
| A. | density |
| B. | specific gravity |
| C. | viscosity |
| D. | compressibility View Answer |
| Answer» C. viscosity | |
| 55. | The frictional resistance for fluids in motion is |
| A. | proportional to the velocity in laminar flow and to the square of the velocity in turbulent flow |
| B. | proportional to the square of the velocity in laminar flow and to the velocity in turbulent flow |
| C. | proportional to the velocity in both laminar flow and turbulent flow |
| D. | proportional to the square of the velocity in both laminar flow and turbulent flow |
| Answer» A. proportional to the velocity in laminar flow and to the square of the velocity in turbulent flow | |
| 56. | The frictional resistance for fluids in motion is |
| A. | dependent on the pressure for both laminar and turbulent flows |
| B. | independent of the pressure for both laminar and turbulent flows |
| C. | dependent on the pressure for laminar flow and independent of the pressure for turbulent flow |
| D. | independent of the pressure for laminar flow and dependent on the pressure for turbulent flow View Answer |
| Answer» B. independent of the pressure for both laminar and turbulent flows | |
| 57. | The frictional resistance for fluids in motion is |
| A. | inversely proportional to the square of the surface area of contact |
| B. | inversely proportional to the surface area of contact |
| C. | proportional to the square of the surface area of contact |
| D. | proportional to the surface area of contact |
| Answer» D. proportional to the surface area of contact | |
| 58. | The frictional resistance for fluids in motion varies |
| A. | slightly with temperature for both laminar and turbulent flows |
| B. | considerably with temperature for both laminar and turbulent flows |
| C. | slightly with temperature for laminar flow and considerably with temperature for turbulent flow |
| D. | considerably with temperature for laminar flow and slightly with temperature for turbulent flow View Answer |
| Answer» D. considerably with temperature for laminar flow and slightly with temperature for turbulent flow View Answer | |
| 59. | Which one of the follflowing is correct? |
| A. | the frictional resistance depends on the nature of the surface area of contact |
| B. | the frictional resistance is independent of the nature of the surface area of contact |
| C. | the frictional resistance depends on the nature of the surface area of contact for laminar flows but is independent of the nature of the surface area of contact for turbulent flows |
| D. | the frictional resistance is independent of the nature of the surface area of contact for laminar flows but depends on the nature of the surface area of contact for turbulent flows View Answer |
| Answer» D. the frictional resistance is independent of the nature of the surface area of contact for laminar flows but depends on the nature of the surface area of contact for turbulent flows View Answer | |
| 60. | Which one of the follflowing is correct? |
| A. | the frictional resistance is always dependent on the nature of the surface area of contact |
| B. | the frictional resistance is always independent of the nature of the surface area of contact |
| C. | the frictional resistance is dependent on the nature of the surface area of contact when the liquid flows at a velocity less than the critical velocity |
| D. | the frictional resistance is independent of the nature of the surface area of contact when the liquid flows at a velocity less than the critical velocity View Answer |
| Answer» D. the frictional resistance is independent of the nature of the surface area of contact when the liquid flows at a velocity less than the critical velocity View Answer | |
| 61. | Which one of the follflowing is correct? |
| A. | Darcy-Weisbach’s formula is generally used for head loss in flow through both pipes and open channels |
| B. | Chezy’s formula is generally used for head loss in flow through both pipes and open channels |
| C. | Darcy-Weisbach’s formula is generally used for head loss in flow through both pipes and Chezy’s formula for open channels |
| D. | Chezy’s formula is generally used for head loss in flow through both pipes and Darcy-Weisbach’s formula for open channels View Answer |
| Answer» C. Darcy-Weisbach’s formula is generally used for head loss in flow through both pipes and Chezy’s formula for open channels | |
| 62. | A liquid flows through pipes 1 and 2 with the same flow velocity. If the ratio of their pipe diameters d1 : d2 be 3:2, what will be the ratio of the head loss in the two pipes? |
| A. | 3:2 |
| B. | 9:4 |
| C. | 2:3 |
| D. | 4:9 View Answer |
| Answer» C. 2:3 | |
| 63. | A liquid flowss through two similar pipes 1 and 2. If the ratio of their flow velocities v1 : v2 be 2:3, what will be the ratio of the head loss in the two pipes? |
| A. | 3:2 |
| B. | 9:4 |
| C. | 2:3 |
| D. | 4:9 View Answer |
| Answer» D. 4:9 View Answer | |
| 64. | A liquid flows with the same velocity through two pipes 1 and 2 having the same diameter. If the length of the second pipe be twice that of the first pipe, what should be the ratio of the head loss in the two pipes? |
| A. | 1:2 |
| B. | 2:1 |
| C. | 1:4 |
| D. | 4:1 |
| Answer» A. 1:2 | |
| 65. | The head loss at the entrance of the pipe is that at it’s exit |
| A. | equal to |
| B. | half |
| C. | twice |
| D. | four times View Answer |
| Answer» B. half | |
| 66. | On which of the factors does the co-efficent of bend in a pipe depend? |
| A. | angle of bend and radius of curvature of the bend |
| B. | angle of bend and radius of the pipe |
| C. | radius of curvature of the bend and pipe |
| D. | radius of curvature of the bend and pipe and angle of bend View Answer |
| Answer» D. radius of curvature of the bend and pipe and angle of bend View Answer | |
| Explanation: Explanation: The co-efficent of bend in a pipe depends on all the three parameters – radius of curvature of the bend, diameter (radius) of the pipe and angle of bend. | |
| 67. | The liquid flowing through a series of pipes can take up__________ |
| A. | Pipes of different diameters |
| B. | Pipes of the same diameters only. |
| C. | Single pipe only |
| D. | Short pipes only View Answer |
| Answer» A. Pipes of different diameters | |
| 68. | What is the total loss developed in a series of pipes? |
| A. | Sum of losses in each pipe only |
| B. | Sum of local losses only |
| C. | Sum of local losses plus the losses in each pipe |
| D. | Zero View Answer |
| Answer» C. Sum of local losses plus the losses in each pipe | |
| 69. | The total head loss for the system is equal to_________ |
| A. | Pipe length |
| B. | Pipe diameter |
| C. | Width of the reservoir |
| D. | Height difference of reservoirs View Answer |
| Answer» D. Height difference of reservoirs View Answer | |
| 70. | Which among the following is not a loss that is developed in the pipe? |
| A. | Entry |
| B. | Exit |
| C. | Connection between two pipes |
| D. | Liquid velocity View Answer |
| Answer» D. Liquid velocity View Answer | |
| 71. | Which among the following is the correct formula for head loss? |
| A. | Z1-Z2 |
| B. | C |
| C. | T2-T1 |
| D. | S2-S1 View Answer |
| Answer» A. Z1-Z2 | |
| 72. | If the two reservoirs are kept at the same level, the head loss is _______ |
| A. | Z1-Z2 |
| B. | Zero |
| C. | T2-T1 |
| D. | S2-S1 |
| Answer» B. Zero | |
| 73. | How do we determine the total discharge through parallel pipes? |
| A. | Add them. |
| B. | Subtract them |
| C. | Multiply them |
| D. | Divide them View Answer |
| Answer» A. Add them. | |
| 74. | The pipe diameter is ________ |
| A. | Directly proportional to fluid density |
| B. | Directly proportional to mass flow rate |
| C. | Inversely proportional to mass flow rate |
| D. | Directly proportional to fluid velocity View Answer |
| Answer» B. Directly proportional to mass flow rate | |
| 75. | Coefficient of friction of a laminar flow is_________ |
| A. | Re/16 |
| B. | Re/64 |
| C. | 16/Re |
| D. | 64/Re View Answer |
| Answer» C. 16/Re | |
| 76. | Shear stress in static fluid is |
| A. | always zero |
| B. | always maximum |
| C. | between zero to maximum |
| D. | unpredictable |
| Answer» A. always zero | |
| Explanation: ways zero | |
| 77. | The specific weight of the fluid depends upon |
| A. | gravitational acceleration |
| B. | mass density of the fluid |
| C. | both a. and b. |
| D. | none of the above |
| Answer» B. mass density of the fluid | |
| Explanation: th a. and b. | |
| 78. | The rate of increase of velocity with respect to change in the position of fluid particle in a flow field is called as |
| A. | local acceleration |
| B. | temporal acceleration |
| C. | convective acceleration |
| D. | all of the above |
| Answer» C. convective acceleration | |
| Explanation: vective acceleration | |
| 79. | Minor losses occur due to |
| A. | sudden enlargement in pipe |
| B. | sudden contraction in pipe |
| C. | bends in pipe |
| D. | all of the above |
| Answer» A. sudden enlargement in pipe | |
| Explanation: l of the above | |
| 80. | Kinematic eddy viscosity (ε) is the ratio of |
| A. | eddy viscosity (η) to dynamic viscosity (μ) |
| B. | eddy viscosity (η) to kinematic viscosity (ν) |
| C. | kinematic viscosity to eddy viscosity (η) |
| D. | eddy viscosity (η) to mass density (ρ) |
| Answer» D. eddy viscosity (η) to mass density (ρ) | |
| Explanation: y viscosity (η) to mass density (ρ) | |
| 81. | The friction factor in fluid flowing through pipe depends upon |
| A. | Reynold’s number |
| B. | relative roughness of pipe surface |
| C. | both a. and b. |
| D. | none of the above |
| Answer» B. relative roughness of pipe surface | |
| Explanation: th a. and b. | |
| 82. | What is the effect of change in Reynold’s number on friction factor in turbulent flow? |
| A. | As the Reynold’s number increases the friction factor increases in turbulent flow |
| B. | As the Reynold’s number increases the friction factor decreases in turbulent flow |
| C. | change in Reynold’s number does not affect the friction factor in turbulent flow |
| D. | unpredictable |
| Answer» A. As the Reynold’s number increases the friction factor increases in turbulent flow | |
| Explanation: s the Reynold’s number increases the friction factor decreases in turbulent flow | |
| 83. | The component of the total force exerted by fluid on a body in the direction parallel to the direction of motion is called as |
| A. | lift |
| B. | drag |
| C. | both a. and b. |
| D. | none of the above |
| Answer» A. lift | |
| Explanation: g | |
| 84. | The sum of components of shear forces in the direction of flow of fluid is called as |
| A. | shear drag |
| B. | friction drag |
| C. | skin drag |
| D. | all of the above |
| Answer» A. shear drag | |
| Explanation: l of the above | |
| 85. | The liquid flowing through a series of pipes can take up__________ |
| A. | Pipes of different diameters |
| B. | Pipes of the same diameters only. |
| C. | Single pipe only |
| D. | Short pipes only |
| Answer» A. Pipes of different diameters | |
| Explanation: When pipes of different diameters are connected at its ends to form a pipe, this pipe so developed is called as pipes in series. They might not have to be of the same diameters. But, having the same diameters are better as it avoids the losses so developed. | |
| 86. | What is the total loss developed in a series of pipes? |
| A. | Sum of losses in each pipe only |
| B. | Sum of local losses only |
| C. | Sum of local losses plus the losses in each pipe |
| D. | Zero |
| Answer» C. Sum of local losses plus the losses in each pipe | |
| Explanation: When the pipes of different diameters are connected in series from end to end to form a pipe line. The total loss so developed is equal to the sum of local losses plus the losses in each pipe. The local losses are developed at the connection point. | |
| 87. | The total head loss for the system is equal to_________ |
| A. | Pipe length |
| B. | Pipe diameter |
| C. | Width of the reservoir |
| D. | Height difference of reservoirs |
| Answer» D. Height difference of reservoirs | |
| Explanation: Total head loss for a system is equal to the height difference of the reservoirs. Height difference is denoted by the letter ‘H’. Total head loss can be equated by summing it up with all the local losses and the losses at each pipe. | |
| 88. | Which among the following is not a loss that is developed in the pipe? |
| A. | Entry |
| B. | Exit |
| C. | Connection between two pipes |
| D. | Liquid velocity |
| Answer» D. Liquid velocity | |
| Explanation: Liquid velocity in the pipe is the velocity with which the liquid travels through different cross sections of the pipe. It is a vector field which is used to describe the motion of a continuum. The length of flow velocity vector is equal to the flow speed. | |
| 89. | Which among the following is the correct formula for head loss? |
| A. | Z1-Z2 |
| B. | C |
| C. | T2-T1 |
| D. | S2-S1 |
| Answer» A. Z1-Z2 | |
| Explanation: Total head loss for a system is equal to the height difference of the reservoirs. Height difference is denoted by the letter ‘H’. Total head loss can be equated by summing it up with all the local losses and the losses at each pipe. Here, the height difference between the reservoirs is Z1-Z2. | |
| 90. | If the two reservoirs are kept at the same level, the head loss is _______ |
| A. | Z1-Z2 |
| B. | Zero |
| C. | T2-T1 |
| D. | S2-S1 |
| Answer» B. Zero | |
| Explanation: Total head loss for a system is equal to the height difference of the reservoirs. Height difference is denoted by the letter ‘H’. The height difference between the reservoirs is Z1-Z2. Since they are of the same level, Z1=Z2. Therefore, head loss is zero. | |
| 91. | How do we determine the total discharge through parallel pipes? |
| A. | Add them. |
| B. | Subtract them |
| C. | Multiply them |
| D. | Divide them |
| Answer» A. Add them. | |
| Explanation: Total discharge in parallel pipes are determined by adding the discharges so developed in individual pipes. If Q1 is the discharge through pipe 1 and Q2 is the discharge through pipe 2. Then the total discharge through parallel pipes is equal to Q1+Q2. | |
| 92. | The pipe diameter is ________ |
| A. | Directly proportional to fluid density |
| B. | Directly proportional to mass flow rate |
| C. | Inversely proportional to mass flow rate |
| D. | Directly proportional to fluid velocity |
| Answer» B. Directly proportional to mass flow rate | |
| Explanation: The pipe diameter is directly proportional to mass flow rate of fluid. Pipe diameter can be calculated if volumetric flow rate and velocity are known. ‘D’ is inversely proportional to its velocity. | |
| 93. | Coefficient of friction of a laminar flow is_________ |
| A. | Re/16 |
| B. | Re/64 |
| C. | 16/Re |
| D. | 64/Re |
| Answer» C. 16/Re | |
| Explanation: Coefficient of friction is defined as the value that shows relationship between force and the normal reaction. It is mainly used to find out an object’s normal force and frictional force. Thus, it is equal to 16/Re | |
| 94. | Which among the following force is developed due to resistance of a fluid flow? |
| A. | Viscous force |
| B. | Inertial force |
| C. | Gravity force |
| D. | Pressure force |
| Answer» A. Viscous force | |
| Explanation: Viscous force is the force that is developed due to resistance of a fluid flow. Viscous force is equal to the product of shear stress due to viscosity and surface area of the fluid. It acts in the opposite direction to that of the acceleration. | |
| 95. | Which among the following force is developed due to resistance in its state of motion? |
| A. | Viscous force |
| B. | Inertial force |
| C. | Gravity force |
| D. | Pressure force |
| Answer» B. Inertial force | |
| Explanation: Inertial force is the force that has resistance to any physical object that undergoes a change in its state of motion. Inertial force is the product acceleration of fluid and its mass. It acts opposite to the direction of acceleration. | |
| 96. | Which among the following is the correct formula for gravitational force? |
| A. | F= Gm1m2/r2 |
| B. | F= Gm1m2 |
| C. | F= m1m2/r2 |
| D. | F= Gm1m2/r3 |
| Answer» A. F= Gm1m2/r2 | |
| Explanation: Gravitational force was derived by Newton’s theory of gravitation. It is defined as the product of mass and acceleration due to gravity of the fluid flow. It is mainly present in cases of open surface fluid flow. | |
| 97. | Which among the following is present in pipe flow? |
| A. | Viscous force |
| B. | Inertial force |
| C. | Gravity force |
| D. | Pressure force |
| Answer» D. Pressure force | |
| Explanation: Pressure is a force that is applied perpendicular to the surface of an object over a unit area of force. It is defined as the product of pressure intensity and cross-sectional area of the flowing fluid. Pressure force is present in case of pipe flow. | |
| 98. | A force that is caused due to attraction of particles in the layer of fluid bulk is called? |
| A. | Viscous force |
| B. | Inertial force |
| C. | Surface tension force |
| D. | Pressure force |
| Answer» C. Surface tension force | |
| Explanation: Surface tension is caused due to the attraction of particles in the surface layer of the fluid in bulk quantities. Surface tension force is defined as the product of surface tension and length of flowing fluid. | |
| 99. | A force that is needed to bring back the body to its original position is called as? |
| A. | Viscous force |
| B. | Elastic force |
| C. | Gravity force |
| D. | Pressure force |
| Answer» C. Gravity force | |
| Explanation: Elastic force is the force that brings a body back to its original position. It is defined as the product of elastic stress and the area of the flowing fluid. | |
| 100. | The drag force acts in _____ to the flow velocity. |
| A. | Perpendicular direction |
| B. | Same direction |
| C. | Opposite direction |
| D. | Different directions |
| Answer» C. Opposite direction | |
| 101. | Drag force is affected by__________ |
| A. | Cross sectional area and smoothness |
| B. | Rigidity and density |
| C. | Pressure and temperature |
| D. | Mass |
| Answer» A. Cross sectional area and smoothness | |
| Explanation: Drag force is affected by cross sectional area and smoothness. If it is affected by cross sectional area, then it is called form drag. If it is affected by surface smoothness, then it is called as surface drag. | |
| 102. | The lift force acts in _____ to the flow velocity. |
| A. | Perpendicular direction |
| B. | Same direction |
| C. | Opposite direction |
| D. | Different directions |
| Answer» A. Perpendicular direction | |
| Explanation: The lift force acts in the perpendicular direction to that of the relative flow velocity. It acts in the perpendicular direction with respect to a surrounding fluid flow. Thus, option Perpendicular direction is correct. | |
| 103. | Which among the following is the correct formula for drag? |
| A. | D = Cd * A * 0.5 * r * V2 |
| B. | D = Cd * A * 0.5 * r * V*2 |
| C. | D = Cd * A * 0.5 * r * V/2 |
| D. | D = 0.5 * r * V |
| Answer» A. D = Cd * A * 0.5 * r * V2 | |
| Explanation: The drag force acts in the opposite direction to that of the relative flow velocity. It acts in the opposite direction with respect to a surrounding fluid flow. Thus, the correct option is D = Cd * A * 0.5 * r * V2. | |
| 104. | Which among the following is the correct formula for lift? |
| A. | D = Cl * A * 0.5 * r * V2 |
| B. | D = Cl * A * 0.5 * r * V*2 |
| C. | D = Cl * A * 0.5 * r * V/2 |
| D. | D = 0.5 * r * V |
| Answer» A. D = Cl * A * 0.5 * r * V2 | |
| Explanation: The lift force is a force that acts in the perpendicular direction to that of the relative flow velocity. It acts in the perpendicular direction with respect to a surrounding fluid flow. Thus, the correct option is D = Cl * A * 0.5 * r * V2. | |
Chapter: Fluid Properties and Flow Characteristics
| 105. | A flow in which the viscosity of fluid is dominating over the inertia force is called |
| A. | Steady flow |
| B. | Unsteady flow |
| C. | Laminar flow |
| D. | Turbulent flow |
| Answer» C. Laminar flow | |
| 106. | The celerity (velocity) of a pressure wave in a fluid is given by (where K = Bulk modulus, and ρ = Density of the fluid) |
| A. | K.ρ |
| B. | K/ρ |
| C. | ρ/K |
| D. | None of these |
| Answer» B. K/ρ | |
| 107. | A fluid having no viscosity is known as |
| A. | Real fluid |
| B. | Ideal fluid |
| C. | Newtonian fluid |
| D. | Non-Newtonian fluid |
| Answer» B. Ideal fluid | |
| 108. | In order to avoid tendency of separation at throat in a Venturimeter, the ratio of the diameter at throat to the diameter of pipe should be |
| A. | 1/16 to 1/8 |
| B. | 1/8 to 1/4 |
| C. | 1/4 to 1/3 |
| D. | 1/3 to 1/2 |
| Answer» D. 1/3 to 1/2 | |
| 109. | Liquids transmit pressure equally in all the directions. This is according to |
| A. | Boyle’s law |
| B. | Archimedes principle |
| C. | Pascal’s law |
| D. | Newton’s formula |
| Answer» C. Pascal’s law | |
| 110. | The discharge over a triangular notch is |
| A. | Inversely proportional to H3/2 |
| B. | Directly proportional to H3/2 |
| C. | Inversely proportional to H5/2 |
| D. | Directly proportional to H5/2 |
| Answer» D. Directly proportional to H5/2 | |
| 111. | A flow whose streamline is represented by a straight line, is called __________ dimensional flow. |
| A. | One |
| B. | Two |
| C. | Three |
| D. | Four |
| Answer» A. One | |
| 112. | The body will float if the force of buoyancy is __________ the weight of the liquid displaced. |
| A. | Equal to |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» C. More than | |
| 113. | The density of water is 1000 kg/m3 at |
| A. | 0° C |
| B. | 0° K |
| C. | 4° C |
| D. | 20° C |
| Answer» C. 4° C | |
| 114. | Bulk modulus of a fluid __________ as the pressure increases. |
| A. | Remain same |
| B. | Decreases |
| C. | Increases |
| D. | None of these |
| Answer» C. Increases | |
| 115. | The coefficient of viscosity may be determined by |
| A. | Capillary tube method |
| B. | Orifice type viscometer |
| C. | Rotating cylinder method |
| D. | All of these |
| Answer» D. All of these | |
| 116. | According to Newton’s law of viscosity, the shear stress on a layer of a fluid is __________ to the rate of shear strain. |
| A. | Equal to |
| B. | Directly proportional |
| C. | Inversely proportional |
| D. | None of these |
| Answer» B. Directly proportional | |
| 117. | A vessel of 4 m3 contains oil which weighs 30 kN. The specific weight of the oil is |
| A. | 4.5 kN/m3 |
| B. | 6 kN/m3 |
| C. | 7.5 kN/m3 |
| D. | 10 kN/m3 |
| Answer» C. 7.5 kN/m3 | |
| 118. | The increase of temperature results in |
| A. | Increase in viscosity of gas |
| B. | No changes in viscosity of liquid |
| C. | Decrease in viscosity of gas |
| D. | Decrease in viscosity of liquid |
| Answer» D. Decrease in viscosity of liquid | |
| 119. | A manometer is used to measure |
| A. | Low pressure |
| B. | Moderate pressure |
| C. | High pressure |
| D. | Atmospheric pressure |
| Answer» C. High pressure | |
| 120. | Which of the following meters is not associated with viscosity? |
| A. | Red wood |
| B. | Say bolt |
| C. | Engler |
| D. | Orsat |
| Answer» D. Orsat | |
| 121. | The specific weight of water in S.I. units is taken as |
| A. | 9.81 kN/m3 |
| B. | 9.81 × 103 N/m3 |
| C. | 9.81 × 10-6 N/mm3 |
| D. | Any one of these |
| Answer» D. Any one of these | |
| 122. | Manometer is used to measure |
| A. | Pressure in pipes, channels etc. |
| B. | Atmospheric pressure |
| C. | Very low pressure |
| D. | Difference of pressure between two points |
| Answer» A. Pressure in pipes, channels etc. | |
| 123. | The flow in which conditions do not change with time at any point, is known as |
| A. | One dimensional flow |
| B. | Uniform flow |
| C. | Steady flow |
| D. | Turbulent flow |
| Answer» C. Steady flow | |
| 124. | A nozzle placed at the end of a water pipe line discharges water at a |
| A. | Low pressure |
| B. | High pressure |
| C. | Low velocity |
| D. | High velocity |
| Answer» D. High velocity | |
| 125. | The pressure of fluid due to hammer blow is |
| A. | Directly proportional to density of fluid |
| B. | Inversely proportional to density of fluid |
| C. | Directly proportional to (density)1/2 of fluid |
| D. | Inversely proportional to (density)1/2 of fluid |
| Answer» C. Directly proportional to (density)1/2 of fluid | |
| 126. | In order to measure the flow with a Venturimeter, it is installed in |
| A. | Horizontal line |
| B. | Inclined line with flow upwards |
| C. | Inclined line with flow downwards |
| D. | Any direction and in any location |
| Answer» D. Any direction and in any location | |
| 127. | If mercury in a barometer is replaced by water, the height of 3.75 cm of mercury will be following cm of water |
| A. | 51 cm |
| B. | 50 cm |
| C. | 52 cm |
| D. | 52.2 cm |
| Answer» A. 51 cm | |
| 128. | According to equation of continuity, |
| A. | w1a1 = w2a2 |
| B. | w1v1 = w2v2 |
| C. | a1v1 = a2v2 |
| D. | a1/v1 = a2/v2 |
| Answer» C. a1v1 = a2v2 | |
| 129. | One poise is equal to |
| A. | 0.1 N-s/m2 |
| B. | 1 N-s/m2 |
| C. | 10 N-s/m2 |
| D. | 100 N-s/m2 |
| Answer» A. 0.1 N-s/m2 | |
| 130. | When a vertical wall is subjected to pressures due to liquid on both sides, the resultant pressure is the __________ of the two pressures. |
| A. | Sum |
| B. | Difference |
| C. | Arithmetic mean |
| D. | Geometric mean |
| Answer» B. Difference | |
| 131. | The mercury does not wet the glass. This is due to the property of the liquid known as |
| A. | Cohesion |
| B. | Adhesion |
| C. | Viscosity |
| D. | Surface tension |
| Answer» D. Surface tension | |
| 132. | When the pressure intensity at a point is more than the local atmospheric pressure, then the difference of these two pressures is called |
| A. | Gauge pressure |
| B. | Absolute pressure |
| C. | Positive gauge pressure |
| D. | Vacuum pressure |
| Answer» C. Positive gauge pressure | |
| 133. | A pipe of length more than double the diameter of orifice fitted externally or internally to the orifice is called a |
| A. | Notch |
| B. | Weir |
| C. | Mouthpiece |
| D. | Nozzle |
| Answer» C. Mouthpiece | |
| 134. | An open tank containing liquid is moving with an acceleration on an inclined plane. The inclination of the free surface of the liquid will be __________ to the acceleration of the tank. |
| A. | Equal to |
| B. | Directly proportional |
| C. | Inversely proportional |
| D. | None of these |
| Answer» B. Directly proportional | |
| 135. | One stoke is equal to |
| A. | 10-2 m2/s |
| B. | 10-3 m2/s |
| C. | 10-4 m2/s |
| D. | 10-6 m2/s |
| Answer» C. 10-4 m2/s | |
| 136. | Falling drops of water become spheres due to the property of |
| A. | Surface tension of water |
| B. | Compressibility of water |
| C. | Capillarity of water |
| D. | Viscosity of water |
| Answer» A. Surface tension of water | |
| 137. | The specific gravity of an oil whose specific weight is 7.85 kN/m3, is |
| A. | 0.8 |
| B. | 1 |
| C. | 1.2 |
| D. | 1.6 |
| Answer» A. 0.8 | |
| 138. | The length of the divergent cone in a Venturimeter is __________ that of the convergent cone. |
| A. | Equal to |
| B. | Double |
| C. | Three to four times |
| D. | Five to six times |
| Answer» C. Three to four times | |
| 139. | The stress-strain relation of the Newtonian fluid is |
| A. | Linear |
| B. | Parabolic |
| C. | Hyperbolic |
| D. | Inverse type |
| Answer» A. Linear | |
| 140. | The viscosity of a liquid __________ its rate of flow through a hole in a vessel. |
| A. | Effects |
| B. | Does not effect |
| C. | Both A and B |
| D. | None of these |
| Answer» A. Effects | |
| 141. | The unit of surface tension is |
| A. | N/m |
| B. | N/m2 |
| C. | N/m3 |
| D. | N-m |
| Answer» A. N/m | |
| 142. | The units of dynamic or absolute viscosity are |
| A. | Metres² per sec |
| B. | kg sec/meter |
| C. | Newton-sec per meter |
| D. | Newton-sec² per meter |
| Answer» C. Newton-sec per meter | |
| 143. | A flow in which the volume of a fluid and its density does not change during the flow is called _________ flow. |
| A. | Incompressible |
| B. | Compressible |
| C. | Viscous |
| D. | None of these |
| Answer» A. Incompressible | |
| 144. | The weight per unit volume of a liquid at a standard temperature and pressure is called |
| A. | Specific weight |
| B. | Mass density |
| C. | Specific gravity |
| D. | None of these |
| Answer» A. Specific weight | |
| 145. | The flow of water through the hole in the bottom of a wash basin is an example of |
| A. | Steady flow |
| B. | Uniform flow |
| C. | Free vortex |
| D. | Forced vortex |
| Answer» C. Free vortex | |
| 146. | A flow whose streamline is represented by a curve, is called |
| A. | One-dimensional flow |
| B. | Two-dimensional flow |
| C. | Three-dimensional flow |
| D. | Four-dimensional flow |
| Answer» B. Two-dimensional flow | |
| 147. | The value of coefficient of discharge is __________ the value of coefficient of velocity. |
| A. | Less than |
| B. | Same as |
| C. | More than |
| D. | None of these |
| Answer» A. Less than | |
| 148. | A fluid whose viscosity does not change with the rate of deformation or shear strain is known as |
| A. | Real fluid |
| B. | Ideal fluid |
| C. | Newtonian fluid |
| D. | Non-Newtonian fluid |
| Answer» B. Ideal fluid | |
| 149. | Flow occurring in a pipeline when a valve is being opened is |
| A. | Steady |
| B. | Unsteady |
| C. | Laminar |
| D. | Vortex |
| Answer» B. Unsteady | |
| 150. | The water pressure per metre length on a vertical masonry wall of dam is (where w = Specific weight of the liquid, and H = Height of the liquid) |
| A. | wH/2 |
| B. | wH |
| C. | wH2/2 |
| D. | wH2/4 |
| Answer» C. wH2/2 | |
| 151. | Euler’s equation in the differential form for the motion of liquids is given by |
| A. | dp/ρ + g.dz + v.dv = 0 |
| B. | dp/ρ – g.dz + v.dv = 0 |
| C. | ρ.dp + g.dz + v.dv = 0 |
| D. | ρ.dp – g.dz + v.dv = 0 |
| Answer» A. dp/ρ + g.dz + v.dv = 0 | |
| 152. | An open tank containing liquid is made to move from rest with a uniform acceleration. The angle 0 which the free surface of liquid makes with the horizontal is such that (where a = Horizontal acceleration of the tank, and g = Acceleration due to gravity) |
| A. | tanθ = a/g |
| B. | tanθ = 2 a/g |
| C. | tanθ = a/2g |
| D. | tanθ = a2/2g |
| Answer» A. tanθ = a/g | |
| 153. | A point, in a compressible flow where the velocity of fluid is zero, is called |
| A. | Critical point |
| B. | Vena contracta |
| C. | Stagnation point |
| D. | None of these |
| Answer» C. Stagnation point | |
| 154. | For very great pressures, viscosity of moss gases and liquids |
| A. | Remain same |
| B. | Increases |
| C. | Decreases |
| D. | Shows erratic behavior |
| Answer» D. Shows erratic behavior | |
| 155. | The angle of contact in case of a liquid depends upon |
| A. | The nature of the liquid and the solid |
| B. | The material which exists above the free surface of the liquid |
| C. | Both of die above |
| D. | Any one of the above |
| Answer» C. Both of die above | |
| 156. | Water is _________ liquid. |
| A. | A compressible |
| B. | An incompressible |
| C. | Both A and B |
| D. | None of these |
| Answer» B. An incompressible | |
| 157. | The unit of kinematic viscosity in S. I. units is |
| A. | N-m/s |
| B. | N-s/m2 |
| C. | m2/s |
| D. | N-m |
| Answer» C. m2/s | |
| 158. | Bernoulli’s equation is applied to |
| A. | Venturimeter |
| B. | Orifice meter |
| C. | Pitot tube |
| D. | All of these |
| Answer» D. All of these | |
| 159. | Rain drops are spherical because of |
| A. | Viscosity |
| B. | Air resistance |
| C. | Surface tension forces |
| D. | Atmospheric pressure |
| Answer» C. Surface tension forces | |
| 160. | General energy equation holds for |
| A. | Steady flow |
| B. | Turbulent flow |
| C. | Laminar flow |
| D. | Non-uniform flow |
| Answer» D. Non-uniform flow | |
| 161. | With an increase in size of tube, the rise or depression of liquid in the tube due to surface tension will |
| A. | Decrease |
| B. | Increase |
| C. | Remain unchanged |
| D. | Depend upon the characteristics of liquid |
| Answer» A. Decrease | |
| 162. | Gauge pressure at a point is equal to the absolute pressure __________ the atmospheric pressure. |
| A. | Plus |
| B. | Minus |
| C. | Divide |
| D. | Multiply |
| Answer» B. Minus | |
| 163. | The dynamic viscosity of gases __________ with rise in temperature. |
| A. | Remain unaffected |
| B. | Increases |
| C. | Decreases |
| D. | None of these |
| Answer» B. Increases | |
| 164. | The pressure of liquid at throat in a Venturimeter is __________ than that at inlet. |
| A. | Higher |
| B. | Lower |
| C. | Same |
| D. | None of these |
| Answer» B. Lower | |
| 165. | The flow in which the velocity vector is identical in magnitude and direction at every point, for any given instant, is known as |
| A. | One dimensional flow |
| B. | Uniform flow |
| C. | Steady flow |
| D. | Turbulent flow |
| Answer» B. Uniform flow | |
| 166. | The specific weight of water is 1000 kg/m3 |
| A. | At normal pressure of 760 mm |
| B. | At 4°C temperature |
| C. | At mean sea level |
| D. | All the above |
| Answer» D. All the above | |
| 167. | If the depth of water in an open channel is greater than the critical depth, the flow is called |
| A. | Critical flow |
| B. | Turbulent flow |
| C. | Tranquil flow |
| D. | Torrential flow |
| Answer» C. Tranquil flow | |
| 168. | The total pressure on the surface of a vertical sluice gate 2 m x 1 m with its top 2 m surface being 0.5 m below the water level will be |
| A. | 500 kg |
| B. | 1000 kg |
| C. | 1500 kg |
| D. | 2000 kg |
| Answer» D. 2000 kg | |
| 169. | A glass tube of small diameter (d) is dipped in fluid. The height of rise or fall in the tube given by (where w = Specific weight of liquid, α = Angle of contact of the liquid surface, and σ = Surface tension) |
| A. | 4wd/σ cosα |
| B. | σ cosα/4wd |
| C. | 4σ cosα/wd |
| D. | wd/4σ cosα |
| Answer» C. 4σ cosα/wd | |
| 170. | Two dimensional flows occurs when |
| A. | The direction and magnitude of the velocity at all points are identical |
| B. | The velocity of successive fluid particles, at any point, is the same at successive periods of time |
| C. | The magnitude and direction of the velocity do not change from point to point in the fluid |
| D. | The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane |
| Answer» D. The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane | |
| 171. | The force per unit length is the unit of |
| A. | Surface tension |
| B. | Compressibility |
| C. | Capillarity |
| D. | Viscosity |
| Answer» A. Surface tension | |
| 172. | One cubic metre of water weighs |
| A. | 100 liters |
| B. | 250 liters |
| C. | 500 liters |
| D. | 1000 liters |
| Answer» D. 1000 liters | |
| 173. | Kinematic viscosity is dependent upon |
| A. | Pressure |
| B. | Distance |
| C. | Density |
| D. | Flow |
| Answer» C. Density | |
| 174. | The Euler’s equation for the motion of liquids is based upon the assumption that |
| A. | The fluid is non – viscous, homogeneous and incompressible |
| B. | The velocity of flow is uniform over the section |
| C. | The flow is continuous, steady and along the stream line |
| D. | All of the above |
| Answer» D. All of the above | |
| 175. | Which of the following instrument can be used for measuring speed of a submarine moving in deep sea? |
| A. | Venturimeter |
| B. | Orifice plate |
| C. | Hot wire anemometer |
| D. | Pitot tube |
| Answer» D. Pitot tube | |
| 176. | Property of a fluid by which its own molecules are attracted is called |
| A. | Adhesion |
| B. | Cohesion |
| C. | Viscosity |
| D. | Compressibility |
| Answer» B. Cohesion | |
| 177. | Which of the following is the unit of kinematic viscosity? |
| A. | Pascal |
| B. | Poise |
| C. | Stoke |
| D. | Faraday |
| Answer» C. Stoke | |
| 178. | A differential manometer is used to measure |
| A. | Atmospheric pressure |
| B. | Pressure in pipes and channels |
| C. | Pressure in Venturimeter |
| D. | Difference of pressures between two points in a pipe |
| Answer» D. Difference of pressures between two points in a pipe | |
| 179. | In a venturi-flume, the flow takes place at |
| A. | Atmospheric pressure |
| B. | Gauge pressure |
| C. | Absolute pressure |
| D. | None of these |
| Answer» A. Atmospheric pressure | |
| 180. | The normal stress is same in all directions at a point in a fluid |
| A. | Only when the fluid is frictionless |
| B. | Only when the fluid is incompressible and has zero viscosity |
| C. | When there is no motion of one fluid layer relative to an adjacent layer |
| D. | Irrespective of the motion of one fluid layer relative to an adjacent layer |
| Answer» C. When there is no motion of one fluid layer relative to an adjacent layer | |
| 181. | A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall per unit length is (where w = Specific weight of liquid, and H = Height of liquid) |
| A. | wH |
| B. | wH/2 |
| C. | wH2/2 |
| D. | wH2/3 |
| Answer» C. wH2/2 | |
| 182. | Which of the following manometer has highest sensitivity? |
| A. | U-tube with water |
| B. | Inclined U-tube |
| C. | U-tube with mercury |
| D. | Micro-manometer with water |
| Answer» D. Micro-manometer with water | |
| 183. | Which of the following statement is wrong? |
| A. | A flow whose streamline is represented by a curve is called two dimensional flow. |
| B. | The total energy of a liquid particle is the sum of potential energy, kinetic energy and pressure energy. |
| C. | The length of divergent portion in a Venturimeter is equal to the convergent portion. |
| D. | A pitot tube is used to measure the velocity of flow at the required point in a pipe. |
| Answer» C. The length of divergent portion in a Venturimeter is equal to the convergent portion. | |
| 184. | Density of water is maximum at |
| A. | 0° C |
| B. | 0° K |
| C. | 4° C |
| D. | 100° C |
| Answer» C. 4° C | |
| 185. | The bulk modulus of elasticity |
| A. | Has the dimensions of 1/pressure |
| B. | Increases with pressure |
| C. | Is large when fluid is more compressible |
| D. | Is independent of pressure and viscosity |
| Answer» B. Increases with pressure | |
| 186. | Kinematic viscosity is equal to |
| A. | Dynamic viscosity/density |
| B. | Dynamic viscosity × density |
| C. | Density/dynamic viscosity |
| D. | 1/dynamic viscosity × density |
| Answer» A. Dynamic viscosity/density | |
| 187. | The atmospheric pressure at sea level is |
| A. | 103 kN/m2 |
| B. | 10.3 m of water |
| C. | 760 mm of mercury |
| D. | All of these |
| Answer» D. All of these | |
| 188. | A glass tube of smaller diameter is used while performing an experiment for the capillary rise of water because |
| A. | It is easier to see through the glass tube |
| B. | Glass tube is cheaper than a metallic tube |
| C. | It is not possible to conduct this experiment with any other tube |
| D. | All of the above |
| Answer» A. It is easier to see through the glass tube | |
| 189. | In an isothermal atmosphere, the pressure |
| A. | Decreases linearly with elevation |
| B. | Remain constant |
| C. | Varies in the same way as the density |
| D. | Increases exponentially with elevation |
| Answer» C. Varies in the same way as the density | |
| 190. | The pressure of a liquid measured with the help of a Piezometer tube is |
| A. | Vacuum pressure |
| B. | Gauge pressure |
| C. | Absolute pressure |
| D. | Atmospheric pressure |
| Answer» B. Gauge pressure | |
| 191. | For a perfect incompressible liquid, flowing in a continuous stream, the total energy of a particle remains the same, while the particle moves from one point to another. This statement is called |
| A. | Continuity equation |
| B. | Bernoulli’s equation |
| C. | Pascal’s law |
| D. | Archimedes’s principle |
| Answer» B. Bernoulli’s equation | |
| 192. | Uniform flow occurs when |
| A. | The direction and magnitude of the velocity at all points are identical |
| B. | The velocity of successive fluid particles, at any point, is the same at successive periods of time |
| C. | The magnitude and direction of the velocity do not change from point to point in the fluid |
| D. | The fluid particles move in plane or parallel planes and the streamline patterns are identical in each pleasure |
| Answer» C. The magnitude and direction of the velocity do not change from point to point in the fluid | |
| 193. | At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be |
| A. | Minimum |
| B. | Maximum |
| C. | Zero |
| D. | Could be any value |
| Answer» D. Could be any value | |
| 194. | Piezometer is used to measure |
| A. | Pressure in pipe, channels etc. |
| B. | Atmospheric pressure |
| C. | Very low pressures |
| D. | Difference of pressure between two points |
| Answer» C. Very low pressures | |
| 195. | The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm”. The pressure at 2.5 m below the oil surface will be |
| A. | 2 metres of water column |
| B. | 3 metres of water column |
| C. | 3.5 metres of water column |
| D. | 4 m of water column |
| Answer» B. 3 metres of water column | |
| 196. | The flow which neglects changes in a transverse direction is known as |
| A. | One dimensional flow |
| B. | Uniform flow |
| C. | Steady flow |
| D. | Turbulent flow |
| Answer» A. One dimensional flow | |
| 197. | A moving fluid mass may be brought to a static equilibrium position, by applying an imaginary inertia force of the same magnitude as that of the accelerating force but in the opposite direction. This statement is called |
| A. | Pascal’s law |
| B. | Archimedes’s principle |
| C. | D-Alembert’s principle |
| D. | None of these |
| Answer» C. D-Alembert’s principle | |
| 198. | The mass per unit volume of a liquid at a standard temperature and pressure is called |
| A. | Specific weight |
| B. | Mass density |
| C. | Specific gravity |
| D. | None of these |
| Answer» B. Mass density | |
| 199. | The velocity of the liquid flowing through the divergent portion of a Venturimeter |
| A. | Remains constant |
| B. | Increases |
| C. | Decreases |
| D. | Depends upon mass of liquid |
| Answer» C. Decreases | |
| 200. | The volumetric change of the fluid caused by a resistance is known as |
| A. | Volumetric strain |
| B. | Volumetric index |
| C. | Compressibility |
| D. | Adhesion |
| Answer» C. Compressibility | |
| 201. | Choose the wrong statement |
| A. | Fluids are capable of flowing |
| B. | Fluids conform to the shape of the containing vessels |
| C. | When in equilibrium, fluids cannot sustain tangential forces |
| D. | When in equilibrium, fluids can sustain shear forces |
| Answer» D. When in equilibrium, fluids can sustain shear forces | |
| 202. | An orifice is said to be large, if |
| A. | The size of orifice is large |
| B. | The velocity of flow is large |
| C. | The available head of liquid is more than 5 times the height of orifice |
| D. | The available head of liquid is less than 5 times the height of orifice |
| Answer» D. The available head of liquid is less than 5 times the height of orifice | |
| 203. | A piece of metal of specific gravity 13.6 is placed in mercury of specific gravity 13.6, what fraction of it volume is under mercury? |
| A. | The metal piece will simply float over the mercury |
| B. | The metal piece will be immersed in mercury by half |
| C. | Whole of the metal piece will be immersed with its top surface just at mercury level |
| D. | Metal piece will sink to the bottom |
| Answer» C. Whole of the metal piece will be immersed with its top surface just at mercury level | |
| 204. | Dynamic viscosity of most of the liquids with rise in temperature |
| A. | Increases |
| B. | Decreases |
| C. | Remain unaffected |
| D. | Unpredictable |
| Answer» B. Decreases | |
| 205. | Select the correct statement |
| A. | Local atmospheric pressure depends upon elevation of locality only |
| B. | Standard atmospheric pressure is the mean local atmospheric pressure a* sea level |
| C. | Local atmospheric pressure is always below standard atmospheric pressure |
| D. | A barometer reads the difference between local and standard atmospheric pressure |
| Answer» B. Standard atmospheric pressure is the mean local atmospheric pressure a* sea level | |
| 206. | The flow in which the particles of a fluid attain such velocities that varies from point to point in magnitude and direction as well as from instant to instant, is known as |
| A. | One dimensional flow |
| B. | Uniform flow |
| C. | Steady flow |
| D. | Turbulent flow |
| Answer» D. Turbulent flow | |
| 207. | The specific weight of sea water is __________ that of pure water. |
| A. | Same as |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» C. More than | |
| 208. | Which of the following instruments is used to measure flow on the application of Bernoulli’s theorem? |
| A. | Venturimeter |
| B. | Orifice plate |
| C. | Nozzle |
| D. | All of the above |
| Answer» D. All of the above | |
| 209. | An ideal flow of any fluid must satisfy |
| A. | Pascal law |
| B. | Newton’s law of viscosity |
| C. | Boundary layer theory |
| D. | Continuity equation |
| Answer» D. Continuity equation | |
| 210. | The height of a water column equivalent to a pressure of 0.15 MPa is |
| A. | 15.3 m |
| B. | 25.3 m |
| C. | 35.3 m |
| D. | 45.3 m |
| Answer» A. 15.3 m | |
| 211. | The ratio of specific weight of a liquid to the specific weight of pure water at a standard temperature is called |
| A. | Density of liquid |
| B. | Specific gravity of liquid |
| C. | Compressibility of liquid |
| D. | Surface tension of liquid |
| Answer» B. Specific gravity of liquid | |
| 212. | A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. The force required on plunger is equal to |
| A. | 10 kg |
| B. | 100 kg |
| C. | 1000 kg |
| D. | 1 kg |
| Answer» A. 10 kg | |
| 213. | The total head of a liquid particle in motion is equal to |
| A. | Pressure head + kinetic head + potential head |
| B. | Pressure head – (kinetic head + potential head) |
| C. | Potential head – (pressure head + kinetic head) |
| D. | Kinetic head – (pressure head + potential head) |
| Answer» A. Pressure head + kinetic head + potential head | |
| 214. | When the Venturimeter is inclined, then for a given flow it will show __________ reading. |
| A. | Same |
| B. | More |
| C. | Less |
| D. | None of these |
| Answer» A. Same | |
| 215. | Cavitation is caused by |
| A. | High velocity |
| B. | High pressure |
| C. | Weak material |
| D. | Low pressure |
| Answer» D. Low pressure | |
| 216. | An ideal flow of any fluid must fulfill the following |
| A. | Newton’s law of motion |
| B. | Newton’s law of viscosity |
| C. | Pascal’ law |
| D. | Continuity equation |
| Answer» D. Continuity equation | |
| 217. | Surface tension |
| A. | Acts in the plane of the interface normal to any line in the surface |
| B. | Is also known as capillarity |
| C. | Is a function of the curvature of the interface |
| D. | Decreases with fall in temperature |
| Answer» A. Acts in the plane of the interface normal to any line in the surface | |
| 218. | Alcohol is used in manometers because |
| A. | It has low vapour pressure |
| B. | It is clearly visible |
| C. | It has low surface tension |
| D. | It can provide longer column due to low density |
| Answer» D. It can provide longer column due to low density | |
| 219. | The discharge through a wholly drowned orifice is given by (where H1 = Height of water (on the upstream side) above the top of the orifice, H2 = Height of water (on the downstream side) above the bottom of the orifice, and H = Difference between two water levels on either side of the orifice) |
| A. | Q = Cd × bH₁ × √(2gh) |
| B. | Q = Cd × bH2 × √(2gh) |
| C. | Q = Cd × b (H2 – H1) × √(2gh) |
| D. | Q = Cd × bH × √(2gh) |
| Answer» C. Q = Cd × b (H2 – H1) × √(2gh) | |
| 220. | If no resistance is encountered by displacement, such a substance is known as |
| A. | Fluid |
| B. | Water |
| C. | Gas |
| D. | Ideal fluid |
| Answer» D. Ideal fluid | |
| 221. | The kinematic viscosity is the |
| A. | Ratio of absolute viscosity to the density of the liquid |
| B. | Ratio of density of the liquid to the absolute viscosity |
| C. | Product of absolute viscosity and density of the liquid |
| D. | Product of absolute viscosity and mass of the liquid |
| Answer» A. Ratio of absolute viscosity to the density of the liquid | |
| 222. | Choose the correct relationship |
| A. | Specific gravity = gravity × density |
| B. | Dynamic viscosity = kinematic viscosity × density |
| C. | Gravity = specific gravity × density |
| D. | Kinematic viscosity = dynamic viscosity × density |
| Answer» B. Dynamic viscosity = kinematic viscosity × density | |
| 223. | The viscosity of water is __________ than that of mercury. |
| A. | Higher |
| B. | Lower |
| C. | Same as |
| D. | None of these |
| Answer» A. Higher | |
| 224. | Surface energy per unit area of a surface is numerically equal to |
| A. | Atmospheric pressure |
| B. | Surface tension |
| C. | Force of adhesion |
| D. | Force of cohesion |
| Answer» B. Surface tension | |
| 225. | Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the |
| A. | Force of adhesion |
| B. | Force of cohesion |
| C. | Force of friction |
| D. | Force of diffusion |
| Answer» B. Force of cohesion | |
| 226. | Which of the following statement is correct? |
| A. | In a compressible flow, the volume of the flowing liquid changes during the flow |
| B. | A flow, in which the volume of the flowing liquid does not change, is called incompressible flow |
| C. | When the particles rotate about their own axes while flowing, the flow is said to be rotational flow |
| D. | All of the above |
| Answer» D. All of the above | |
| 227. | Choose the wrong statement |
| A. | Viscosity of a fluid is that property which determines the amount of its resistance to a shearing force |
| B. | Viscosity is due primarily to interaction between fluid molecules |
| C. | Viscosity of liquids decreases with increase in temperature |
| D. | Viscosity of liquids is appreciably affected by change in pressure |
| Answer» D. Viscosity of liquids is appreciably affected by change in pressure | |
| 228. | The unit of dynamic viscosity in S.I. units is |
| A. | N-m/s2 |
| B. | N-s/m2 |
| C. | Poise |
| D. | Stoke |
| Answer» B. N-s/m2 | |
| 229. | A perfect gas |
| A. | Has constant viscosity |
| B. | Has zero viscosity |
| C. | Is in compressible |
| D. | None of the above |
| Answer» D. None of the above | |
| 230. | In a static fluid |
| A. | Resistance to shear stress is small |
| B. | Fluid pressure is zero |
| C. | Linear deformation is small |
| D. | Only normal stresses can exist |
| Answer» D. Only normal stresses can exist | |
| 231. | One liter of water occupies a volume of |
| A. | 100 cm3 |
| B. | 250 cm3 |
| C. | 500 cm3 |
| D. | 1000 cm3 |
| Answer» D. 1000 cm3 | |
| 232. | The maximum discharge over a broad crested weir is |
| A. | 0.384 Cd × L × H1/2 |
| B. | 0.384 Cd × L × H3/2 |
| C. | 1.71 Cd × L × H1/2 |
| D. | 1.71 Cd × L × H3/2 |
| Answer» D. 1.71 Cd × L × H3/2 | |
| 233. | The ratio of absolute viscosity to mass density is known as |
| A. | Specific viscosity |
| B. | Viscosity index |
| C. | Kinematic viscosity |
| D. | Coefficient of viscosity |
| Answer» C. Kinematic viscosity | |
| 234. | Hot wire anemometer is used to measure |
| A. | Pressure in gases |
| B. | Liquid discharge |
| C. | Pressure in liquids |
| D. | Gas velocities |
| Answer» D. Gas velocities | |
| 235. | Venturimeter is used to |
| A. | Measure the velocity of a flowing liquid |
| B. | Measure the pressure of a flowing liquid |
| C. | Measure the discharge of liquid flowing in a pipe |
| D. | Measure the pressure difference of liquid flowing between two points in a pipe line |
| Answer» C. Measure the discharge of liquid flowing in a pipe | |
| 236. | The pressure measured with the help of a pressure gauge is called |
| A. | Atmospheric pressure |
| B. | Gauge pressure |
| C. | Absolute pressure |
| D. | Mean pressure |
| Answer» B. Gauge pressure | |
| 237. | In order to increase sensitivity of U-tube manometer, one leg is usually inclined by angle ‘θ’. Sensitivity of inclined tube to sensitivity of U-tube is equal to |
| A. | Sinθ |
| B. | 1/Sinθ |
| C. | Cos θ |
| D. | 1/Cosθ |
| Answer» B. 1/Sinθ | |
| 238. | Capillary action is due to the |
| A. | Surface tension |
| B. | Cohesion of the liquid |
| C. | Adhesion of the liquid molecules and the molecules on the surface of a solid |
| D. | All of the above |
| Answer» D. All of the above | |
| 239. | The intensity of pressure on an immersed surface __________ with the increase in depth. |
| A. | Does not change |
| B. | Increases |
| C. | Decreases |
| D. | None of these |
| Answer» B. Increases | |
| 240. | Stoke is the unit of |
| A. | Kinematic viscosity in C. G. S. units |
| B. | Kinematic viscosity in M. K. S. units |
| C. | Dynamic viscosity in M. K. S. units |
| D. | Dynamic viscosity in S. I. units |
| Answer» A. Kinematic viscosity in C. G. S. units | |
| 241. | The vapour pressure over the concave surface is |
| A. | Less man the vapour pressure over the plane surface |
| B. | Equal to the vapour pressure over the plane surface |
| C. | Greater than the vapour pressure over the plane surface |
| D. | Zero |
| Answer» A. Less man the vapour pressure over the plane surface | |
| 242. | Mercury is often used in barometer because |
| A. | It is the best liquid |
| B. | The height of barometer will be less |
| C. | Its vapour pressure is so low that it may be neglected |
| D. | Both (B) and (C) |
| Answer» D. Both (B) and (C) | |
| 243. | Gradually varied flow is |
| A. | Steady uniform |
| B. | Non-steady non-uniform |
| C. | Non-steady uniform |
| D. | Steady non-uniform |
| Answer» D. Steady non-uniform | |
| 244. | The viscosity of water at 20°C is |
| A. | One stoke |
| B. | One centistoke |
| C. | One poise |
| D. | One centipoise |
| Answer» D. One centipoise | |
| 245. | According to Bernoulli’s equation for steady ideal fluid flow |
| A. | Principle of conservation of mass holds |
| B. | Velocity and pressure are inversely proportional |
| C. | Total energy is constant throughout |
| D. | The energy is constant along a streamline but may vary across streamlines |
| Answer» D. The energy is constant along a streamline but may vary across streamlines | |
| 246. | Bernoulli equation deals with the law of conservation of |
| A. | Mass |
| B. | Momentum |
| C. | Energy |
| D. | Work |
| Answer» C. Energy | |
| 247. | If the surface of liquid is convex, men |
| A. | Cohesion pressure is negligible |
| B. | Cohesion pressure is decreased |
| C. | Cohesion pressure is increased |
| D. | There is no cohesion pressure |
| Answer» C. Cohesion pressure is increased | |
| 248. | The atmospheric pressure with rise in altitude decreases |
| A. | Linearly |
| B. | First slowly and then steeply |
| C. | First steeply and then gradually |
| D. | Unpredictable |
| Answer» B. First slowly and then steeply | |
| 249. | Dynamic viscosity of most of the gases with rise in temperature |
| A. | Increases |
| B. | Decreases |
| C. | Remain unaffected |
| D. | Unpredictable |
| Answer» A. Increases | |
| 250. | According to Bernoulli’s equation |
| A. | Z + p/w + v²/2g = constant |
| B. | Z + p/w – v²/2g = constant |
| C. | Z – p/w + v²/2g = constant |
| D. | Z – p/w – v²/2g = constant |
| Answer» A. Z + p/w + v²/2g = constant | |
| 251. | For a body floating in a liquid the normal pressure exerted by the liquid acts at |
| A. | Bottom surface of the body |
| B. | C.G. of the body |
| C. | Metacenter |
| D. | All points on the surface of the body |
| Answer» D. All points on the surface of the body | |
| 252. | Newton’s law of viscosity is a relationship between |
| A. | Pressure, velocity and temperature |
| B. | Shear stress and rate of shear strain |
| C. | Shear stress and velocity |
| D. | Rate of shear strain and temperature |
| Answer» B. Shear stress and rate of shear strain | |
| 253. | A fluid in equilibrium can’t sustain |
| A. | Tensile stress |
| B. | Compressive stress |
| C. | Shear stress |
| D. | Bending stress |
| Answer» C. Shear stress | |
| 254. | Liquids |
| A. | Cannot be compressed |
| B. | Occupy definite volume |
| C. | Are not affected by change in pressure and temperature |
| D. | None of the above |
| Answer» D. None of the above | |
| 255. | When a cylindrical vessel containing liquid is resolved, the surface of the liquid takes the shape of |
| A. | A triangle |
| B. | A paraboloid |
| C. | An ellipse |
| D. | None of these |
| Answer» B. A paraboloid | |
| 256. | Fluid is a substance that |
| A. | Cannot be subjected to shear forces |
| B. | Always expands until it fills any container |
| C. | Has the same shear stress at a point regardless of its motion |
| D. | Cannot remain at rest under action of any shear force |
| Answer» D. Cannot remain at rest under action of any shear force | |
| 257. | The property of a fluid which enables it to resist tensile stress is known as |
| A. | Compressibility |
| B. | Surface tension |
| C. | Cohesion |
| D. | Adhesion |
| Answer» C. Cohesion | |
| 258. | The surface tension of mercury at normal temperature compared to that of water is |
| A. | More |
| B. | Less |
| C. | Same |
| D. | More or less depending on size of glass tube |
| Answer» A. More | |
| 259. | The unit of viscosity is |
| A. | Meters² per sec |
| B. | kg-sec/meter |
| C. | Newton-sec per meter² |
| D. | Newton-sec per meter |
| Answer» B. kg-sec/meter | |
| 260. | Choose the wrong statement. Alcohol is used in manometer, because |
| A. | Its vapour pressure is low |
| B. | It provides suitable meniscus for the inclined tube |
| C. | Its density is less |
| D. | It provides longer length for a given pressure difference |
| Answer» A. Its vapour pressure is low | |
| 261. | A fluid which obeys the Newton’s law of viscosity is termed as |
| A. | Real fluid |
| B. | Ideal fluid |
| C. | Newtonian fluid |
| D. | Non-Newtonian fluid |
| Answer» C. Newtonian fluid | |
| 262. | In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than |
| A. | Frictional force |
| B. | Viscosity |
| C. | Surface friction |
| D. | All of the above |
| Answer» D. All of the above | |
| 263. | The value of coefficient of velocity for a sharp edged orifice __________ with the head of water. |
| A. | Decreases |
| B. | Increases |
| C. | Remain same |
| D. | None of these |
| Answer» B. Increases | |
| 264. | If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be |
| A. | Higher than the surface of liquid |
| B. | The same as the surface of liquid |
| C. | Lower than the surface of liquid |
| D. | Unpredictable |
| Answer» C. Lower than the surface of liquid | |
| 265. | A one dimensional flow is one which |
| A. | Is uniform flow |
| B. | Is steady uniform flow |
| C. | Takes place in straight lines |
| D. | Involves zero transverse component of flow |
| Answer» D. Involves zero transverse component of flow | |
| 266. | According to Manning’s formula, the discharge through an open channel is (where M = Manning’s constant) |
| A. | A × M × m1/2 × i2/3 |
| B. | A × M × m2/3 × i1/2 |
| C. | A1/2 × M2/3 × m × i |
| D. | A2/3 × M1/3 × m × i |
| Answer» B. A × M × m2/3 × i1/2 | |
| 267. | The property of fluid by virtue of which it offers resistance to shear is called |
| A. | Surface tension |
| B. | Adhesion |
| C. | Adhesion |
| D. | Viscosity |
| Answer» D. Viscosity | |
| 268. | Coefficient of velocity is defined as the ratio of |
| A. | Actual velocity of jet at vena contracta to the theoretical velocity |
| B. | Area of jet at vena contracta to the area of orifice |
| C. | Actual discharge through an orifice to the theoretical discharge |
| D. | None of the above |
| Answer» A. Actual velocity of jet at vena contracta to the theoretical velocity | |
| 269. | A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm² and a volume of 0.039 m3 at 150 kg/cm². The bulk modulus of elasticity of liquid is |
| A. | 400 kg/cm² |
| B. | 4000 kg/cm² |
| C. | 40 × 10⁵ kg/cm² |
| D. | 40 × 10⁶ kg/cm² |
| Answer» B. 4000 kg/cm² | |
| 270. | The mass of 2.5 m3 of a certain liquid is 2 tonnes. Its mass density is |
| A. | 200 kg/m3 |
| B. | 400 kg/m3 |
| C. | 600 kg/m3 |
| D. | 800 kg/m3 |
| Answer» D. 800 kg/m3 | |
| 271. | Free surface of a liquid tends to contract to the smallest possible area due to force of |
| A. | Surface tension |
| B. | Viscosity |
| C. | Friction |
| D. | Cohesion |
| Answer» A. Surface tension | |
Chapter: Dimensional Analysis
| 272. | When the Mach number is less than unity, the flow is called |
| A. | Sub-sonic flow |
| B. | Sonic flow |
| C. | Super-sonic flow |
| D. | Hyper-sonic flow |
| Answer» A. Sub-sonic flow | |
| 273. | The product of mass and acceleration of flowing liquid is called |
| A. | Inertia force |
| B. | Viscous force |
| C. | Gravity force |
| D. | Pressure force |
| Answer» A. Inertia force | |
| 274. | Ratio of inertia force to elastic force is known as |
| A. | Mach number |
| B. | Froude number |
| C. | Reynolds number |
| D. | Weber’s number |
| Answer» A. Mach number | |
| 275. | Euler’s number is the ratio of __________ force to pressure force. |
| A. | Inertia |
| B. | Gravity |
| C. | Viscous |
| D. | None of these |
| Answer» A. Inertia | |
| 276. | Ratio of inertia force to surface tension is known as |
| A. | Mach number |
| B. | Froude number |
| C. | Reynolds’s number |
| D. | Weber’s number |
| Answer» D. Weber’s number | |
| 277. | The force present in a moving liquid is |
| A. | Inertia force |
| B. | Viscous force |
| C. | Gravity force |
| D. | All of these |
| Answer» D. All of these | |
| 278. | A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water? |
| A. | 10 m/sec |
| B. | 25 m/sec |
| C. | 2 m/sec |
| D. | 50 m/sec |
| Answer» C. 2 m/sec | |
| 279. | When the Mach number is more than 6, the flow is called |
| A. | Sub-sonic flow |
| B. | Sonic flow |
| C. | Super-sonic flow |
| D. | Hyper-sonic flow |
| Answer» D. Hyper-sonic flow | |
| 280. | The ratio of the inertia force to the viscous force is called |
| A. | Reynold’s number |
| B. | Froude’s number |
| C. | Weber’s number |
| D. | Euler’s number |
| Answer» A. Reynold’s number | |
| 281. | Reynold’s number is the ratio of the inertia force to the |
| A. | Surface tension force |
| B. | Viscous force |
| C. | Gravity force |
| D. | Elastic force |
| Answer» B. Viscous force | |
| 282. | Froude number is significant in |
| A. | Supersonics, as with projectile and jet propulsion |
| B. | Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc. |
| C. | Simultaneous motion through two fluids where there is a surface of discontinuity, gravity forces, and wave making effect, as with ship’s hulls |
| D. | All of the above |
| Answer» C. Simultaneous motion through two fluids where there is a surface of discontinuity, gravity forces, and wave making effect, as with ship’s hulls | |
| 283. | Reynold’s number is the ratio of inertia force to |
| A. | Pressure force |
| B. | Elastic force |
| C. | Gravity force |
| D. | Viscous force |
| Answer» D. Viscous force | |
| 284. | Principle of similitude forms the basis of |
| A. | Comparing two identical equipments |
| B. | Designing models so that the result can be converted to prototypes |
| C. | Comparing similarity between design and actual equipment |
| D. | Hydraulic designs |
| Answer» B. Designing models so that the result can be converted to prototypes | |
| 285. | Select the correct statement |
| A. | Weber’s number is the ratio of inertia force to elastic force |
| B. | Weber’s number is the ratio of gravity force to surface tension force |
| C. | Weber’s number is the ratio of viscous force to pressure force |
| D. | Weber’s number is the ratio of inertia force to surface tension force |
| Answer» D. Weber’s number is the ratio of inertia force to surface tension force | |
| 286. | For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal |
| A. | Ratio of inertial force to force due to viscosity |
| B. | Ratio of inertial force to force due to gravitation |
| C. | Ratio of inertial force to force due to surface tension |
| D. | All the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity |
| Answer» D. All the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity | |
| 287. | The ratio of the inertia force to the __________ is called Euler’s number. |
| A. | Pressure force |
| B. | Elastic force |
| C. | Surface tension force |
| D. | Viscous force |
| Answer» A. Pressure force | |
| 288. | Dimensions of surface tension are |
| A. | ML°T⁻² |
| B. | ML°T |
| C. | ML r² |
| D. | ML²T² |
| Answer» A. ML°T⁻² | |
Chapter: Pumps
| 289. | Centrifugal pump is a |
| A. | Turbomachinery |
| B. | Flow regulating device |
| C. | Drafting device |
| D. | Intercooling device View Answer |
| Answer» A. Turbomachinery | |
| 290. | Turbomachines work under |
| A. | Newtons first law |
| B. | Newtons second law |
| C. | Newtons third law |
| D. | Kepler’s law |
| Answer» B. Newtons second law | |
| 291. | The main function of centrifugal pumps are to |
| A. | Transfer speed |
| B. | Transfer pressure |
| C. | Transfer temperature |
| D. | Transfer energy |
| Answer» D. Transfer energy | |
| 292. | Turbines and compressors work with the gas, while centrifugal pump transfers energy. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 293. | The inlet passage of water entry is controlled by |
| A. | Head race |
| B. | Gate |
| C. | Tail race |
| D. | Pump View Answer |
| Answer» B. Gate | |
| 294. | Centrifugal pumps are used to transport |
| A. | Pressure |
| B. | Speed |
| C. | Power |
| D. | Fluid View Answer |
| Answer» D. Fluid View Answer | |
| 295. | Centrifugal pumps transport fluids by converting |
| A. | Kinetic energy to hydrodynamic energy |
| B. | Hydrodynamic energy to kinetic energy |
| C. | Mechanical energy to kinetic energy |
| D. | Mechanical energy to Hydrodynamic energy View Answer |
| Answer» A. Kinetic energy to hydrodynamic energy | |
| 296. | With the increase in load, Energy in the turbine |
| A. | Decreases |
| B. | Increases |
| C. | Remains same |
| D. | Independent View Answer |
| Answer» A. Decreases | |
| 297. | When the balancing of the turbine is disturbed, we use |
| A. | Throttle governing |
| B. | Steam governing |
| C. | Nozzle governing |
| D. | Emergency governing View Answer |
| Answer» D. Emergency governing View Answer | |
| 298. | The fluid coming into the centrifugal pump is accelerated by |
| A. | Throttle |
| B. | Impeller |
| C. | Nozzle |
| D. | Governor View Answer |
| Answer» B. Impeller | |
| 299. | A gear pump uses |
| A. | Petrochemical pumps |
| B. | Meshing of gears |
| C. | Froth pumps |
| D. | Airlift pumps View Answer |
| Answer» B. Meshing of gears | |
| 300. | The fundamental significance of all the turbomachinery is |
| A. | Conservation of momentum |
| B. | Conservation of mass |
| C. | Conservation of heat |
| D. | Conservation of speed View Answer |
| Answer» A. Conservation of momentum | |
| 301. | The most common pump used for hydraulic fluid power application is |
| A. | Centrifugal pumps |
| B. | Gear pump |
| C. | Froth pumps |
| D. | Airlift pumps View Answer |
| Answer» B. Gear pump | |
| 302. | The change of angular momentum in a pump is equal to the |
| A. | Sum of speeds |
| B. | Sum of individual momentum |
| C. | Sum of temperatures |
| D. | Sum of energy transferred from a body View Answer |
| Answer» B. Sum of individual momentum | |
| 303. | Conservation of angular momentum is described by |
| A. | Newtons equation |
| B. | Euler’s equation |
| C. | Rutherford’s equation |
| D. | Maxim equation View Answer |
| Answer» B. Euler’s equation | |
| 304. | Gear pumps are mainly used in chemical installations because they pump |
| A. | High viscosity fluids |
| B. | High density fluids |
| C. | High pressure fluids |
| D. | High temperature fluids View Answer |
| Answer» A. High viscosity fluids | |
| 305. | The inlet passage of centrifugal pump is controlled by |
| A. | Gate |
| B. | Head race |
| C. | Turbine |
| D. | Pump View Answer |
| Answer» A. Gate | |
| 306. | Gear pumps are used to transport |
| A. | Pressure |
| B. | Speed |
| C. | Power |
| D. | Fluid View Answer |
| Answer» D. Fluid View Answer | |
| 307. | Vertical Centrifugal pumps are also called as |
| A. | Cantilever pumps |
| B. | Hydrodynamic pump |
| C. | Mechanical pump |
| D. | Hydroelectric pump View Answer |
| Answer» A. Cantilever pumps | |
| 308. | The rotational kinetic energy comes from |
| A. | Engine motor |
| B. | Pump |
| C. | Tank |
| D. | Draft tube View Answer |
| Answer» A. Engine motor | |
| 309. | Gear pumps are |
| A. | Tangential flow pumps |
| B. | Positive displacement pumps |
| C. | Negative displacement pumps |
| D. | Radial pumps View Answer |
| Answer» A. Tangential flow pumps | |
| 310. | The fluid gains while passing through the impeller. |
| A. | Velocity |
| B. | Pressure |
| C. | Temperature |
| D. | Velocity and pressure View Answer |
| Answer» D. Velocity and pressure View Answer | |
| 311. | What is the shape of the diffuser in the centrifugal pump? |
| A. | Round |
| B. | Dough nut |
| C. | Rectangle |
| D. | Cylindrical View Answer |
| Answer» B. Dough nut | |
| 312. | When the casing in a centrifugal pump decelerates the flow, what increases? |
| A. | Pressure |
| B. | Temperature |
| C. | Volume |
| D. | Flow rate View Answer |
| Answer» A. Pressure | |
| 313. | The velocity imparted by the impeller is converted into |
| A. | Pressure energy |
| B. | Kinetic energy |
| C. | Momentum |
| D. | Potential energy View Answer |
| Answer» A. Pressure energy | |
| 314. | The consequence of Newtons second law is |
| A. | Conservation of angular momentum |
| B. | Conservation of mass |
| C. | Conservation of potential energy |
| D. | Conservation of kinetic energy View Answer |
| Answer» A. Conservation of angular momentum | |
| 315. | What is a major advantage of centrifugal pump? |
| A. | Cost |
| B. | Simple in construction |
| C. | Efficiency |
| D. | Pump parameters View Answer |
| Answer» B. Simple in construction | |
| 316. | ‘Ht’ means |
| A. | Tangential head |
| B. | Horizontally head |
| C. | Theory head pressure |
| D. | Radially head pressure View Answer |
| Answer» C. Theory head pressure | |
| 317. | Different velocities in a centrifugal pump are determined by using |
| A. | Velocity triangle |
| B. | Reynolds number |
| C. | Froude number |
| D. | Overall efficiency View Answer |
| Answer» A. Velocity triangle | |
| 318. | With the increase in the input power, efficiency |
| A. | Increases |
| B. | Decreases |
| C. | Same |
| D. | Independent View Answer |
| Answer» B. Decreases | |
| 319. | What does PSP stand for? |
| A. | Pump start procedure |
| B. | Positive start pump |
| C. | Pump start pointer |
| D. | Positive start pointer View Answer |
| Answer» A. Pump start procedure | |
| 320. | With the increase in the flow rate, efficiency |
| A. | Decreases |
| B. | Increases |
| C. | Remains same |
| D. | Independent View Answer |
| Answer» B. Increases | |
| 321. | Pump efficiency is defined as the ratio of |
| A. | Pressure to temperature |
| B. | Temperature to pressure |
| C. | Water horsepower to pump horsepower |
| D. | Pump horse power to water horse power View Answer |
| Answer» C. Water horsepower to pump horsepower | |
| 322. | The difference in the total head of the pump is called |
| A. | Manometric head |
| B. | Euler head |
| C. | Pressure head |
| D. | Shaft head View Answer |
| Answer» A. Manometric head | |
| 323. | The ratio of manometric head to the work head is called |
| A. | Manometric head |
| B. | Euler head |
| C. | Pressure head |
| D. | Shaft head View Answer |
| Answer» B. Euler head | |
| 324. | With the increase in energy head, efficiency |
| A. | Decreases |
| B. | Increases |
| C. | Remains same |
| D. | Independent View Answer |
| Answer» B. Increases | |
| 325. | The head added by the pump is a sum of |
| A. | Pressure |
| B. | Static lift |
| C. | Volume |
| D. | Flow rate View Answer |
| Answer» B. Static lift | |
| 326. | PHE stands for |
| A. | Pump Hydraulic efficiency |
| B. | Pressure Hydraulic efficiency |
| C. | Power Hydraulic efficiency |
| D. | Pump hydraulic engine View Answer |
| Answer» A. Pump Hydraulic efficiency | |
| 327. | With increase in power, the efficiency |
| A. | Decreases |
| B. | Increases |
| C. | Remains same |
| D. | Independent View Answer |
| Answer» A. Decreases | |
| 328. | Which among the following is used in mineral industries? |
| A. | Vertical pumps |
| B. | Horizontal pumps |
| C. | Froth pumps |
| D. | Multistage pumps View Answer |
| Answer» C. Froth pumps | |
| 329. | Vertical centrifugal pumps are also called as |
| A. | Froth pumps |
| B. | Multistage pumps |
| C. | Cantilever pumps |
| D. | Magnetic pumps View Answer |
| Answer» C. Cantilever pumps | |
| 330. | Vertical pump uses |
| A. | Draft tube |
| B. | Throttle bush |
| C. | Stuffing box |
| D. | Interlining View Answer |
| Answer» B. Throttle bush | |
| 331. | The most common application of vertical centrifugal pump is used in |
| A. | Parts washer |
| B. | Mineral industry |
| C. | Paper plating |
| D. | Jukebox View Answer |
| Answer» A. Parts washer | |
| 332. | What does BEP stand for? |
| A. | Best efficiency point |
| B. | Brake ejection point |
| C. | Break effect point |
| D. | Best effect point View Answer |
| Answer» A. Best efficiency point | |
| 333. | The height of a column in a pump is called as |
| A. | Vertical head |
| B. | Horizontal head |
| C. | Static head |
| D. | Multi head View Answer |
| Answer» C. Static head | |
| 334. | The centrifugal pump has varying flow depending on the |
| A. | Pressure |
| B. | Static lift |
| C. | Volume |
| D. | Flow rate View Answer |
| Answer» A. Pressure | |
| 335. | What is purpose of froth in froth pumps? |
| A. | Separates rich minerals |
| B. | Mixes rich minerals |
| C. | Removes ores |
| D. | Detects oil View Answer |
| Answer» A. Separates rich minerals | |
| 336. | When froth blocks the pump, it leads to |
| A. | Separation of rich minerals |
| B. | Mixing of rich minerals |
| C. | Removing of ores |
| D. | Loss of prime View Answer |
| Answer» D. Loss of prime View Answer | |
| 337. | What affects volumetric efficiency of the pump? |
| A. | Complex interactions |
| B. | Internal interactions |
| C. | Retain flow |
| D. | Air flow View Answer |
| Answer» A. Complex interactions | |
| 338. | What is the purpose of inducer in a froth pump? |
| A. | It recirculates air |
| B. | The pressurizes the air |
| C. | Froths are generated |
| D. | It breaks the bubbles View Answer |
| Answer» D. It breaks the bubbles View Answer | |
| 339. | A multistage centrifugal pumps has more than two |
| A. | Pumps |
| B. | Impellers |
| C. | Turbines |
| D. | Magnetic pumps View Answer |
| Answer» B. Impellers | |
| 340. | The impeller is mounted on a |
| A. | Draft tube |
| B. | Throttle bush |
| C. | Stuffing box |
| D. | Shaft View Answer |
| Answer» D. Shaft View Answer | |
| 341. | At each stage the fluid is directed |
| A. | Towards the centre |
| B. | Away the centre |
| C. | Towards the surface |
| D. | Away from the centre View Answer |
| Answer» A. Towards the centre | |
| 342. | If the cylinder is filled with fuel or air it is said to be |
| A. | 100% efficient |
| B. | Transfer efficient |
| C. | Nil efficient |
| D. | Flow effective View Answer |
| Answer» A. 100% efficient | |
| 343. | SOH in a pump stands for_ |
| A. | Shut Off head |
| B. | Shut off heat |
| C. | Shut off hybrid |
| D. | Set off head View Answer |
| Answer» A. Shut Off head | |
| 344. | At higher pressures, the impeller is connected in |
| A. | Series |
| B. | Parallel |
| C. | Equilibrium |
| D. | Series and parallel View Answer |
| Answer» A. Series | |
| 345. | When the flow output is higher, impellers are connected in |
| A. | Series |
| B. | Parallel |
| C. | Equilibrium |
| D. | Series and parallel View Answer |
| Answer» B. Parallel | |
| 346. | The point at which piping system controls the flow rate is called |
| A. | Pressure point |
| B. | Static lift |
| C. | Operating point |
| D. | Flow point View Answer |
| Answer» C. Operating point | |
| 347. | What is the common application of multistage centrifugal pump? |
| A. | Mineral industries |
| B. | Boiler feed water pump |
| C. | Removes ores |
| D. | Detects oil View Answer |
| Answer» B. Boiler feed water pump | |
| 348. | A multistage centrifugal pump produces a pressure of |
| A. | 10 Pa |
| B. | 100 MPa |
| C. | 21 MPa |
| D. | 150 MPa View Answer |
| Answer» C. 21 MPa | |
| 349. | All energy that is transferred from the fluid is derived from |
| A. | Electrical energy |
| B. | Mechanical energy |
| C. | Thermal energy |
| D. | Chemical energy View Answer |
| Answer» B. Mechanical energy | |
| 350. | The point at which the centrifugal pump operates at maximum efficiency is called |
| A. | Duty point |
| B. | Flow point |
| C. | Static point |
| D. | Operating point View Answer |
| Answer» A. Duty point | |
| 351. | What does TDH stand for? |
| A. | Total dynamic head |
| B. | Total depth head |
| C. | Tight drum head |
| D. | Target dynamic head View Answer |
| Answer» A. Total dynamic head | |
| 352. | The mechanical energy can be measured by |
| A. | Adiabatic expansion |
| B. | Isentropic compression |
| C. | Adiabatic compression |
| D. | Isentropic expansion View Answer |
| Answer» B. Isentropic compression | |
| 353. | How many impellers does a multistage centrifugal pump have? |
| A. | Zero |
| B. | One |
| C. | Exactly two |
| D. | Two and more View Answer |
| Answer» D. Two and more View Answer | |
| 354. | The energy usage in pumping installation is determined by |
| A. | Friction characteristics |
| B. | Pipe diameter |
| C. | Surface tension |
| D. | Thermal expansion View Answer |
| Answer» A. Friction characteristics | |
| 355. | Which among the following is a friction factor? |
| A. | Newtons factor |
| B. | Darcy’s factor |
| C. | Transfer temperature |
| D. | Heizenberg’s factor View Answer |
| Answer» B. Darcy’s factor | |
| 356. | What is the dimension for Darcy’s friction factor? |
| A. | kg/m |
| B. | N/mm |
| C. | kg |
| D. | Dimensionless View Answer |
| Answer» D. Dimensionless View Answer | |
| 357. | Formation of bubbles in an impeller is called |
| A. | Cavities |
| B. | Defects |
| C. | Friction |
| D. | Heat burn View Answer |
| Answer» A. Cavities | |
| 358. | Centrifugal pump works by imparting |
| A. | Potential energy |
| B. | Kinetic energy |
| C. | Heat energy |
| D. | Electrical energy View Answer |
| Answer» B. Kinetic energy | |
| 359. | What is the full form of NPSH in a pump? |
| A. | Net pressure suction head |
| B. | Net positive suction head |
| C. | Non-pressure suction head |
| D. | Net pressure super head View Answer |
| Answer» B. Net positive suction head | |
| 360. | When the NPSH is low, it leads to |
| A. | Breaking |
| B. | Wear |
| C. | Corrosion |
| D. | Cavitation View Answer |
| Answer» D. Cavitation View Answer | |
| 361. | Wear of impeller can be worsened by |
| A. | Draft tube |
| B. | Pump pressure |
| C. | Suspended solenoids |
| D. | Turbine head View Answer |
| Answer» C. Suspended solenoids | |
| 362. | Which pump is the most efficient centrifugal pump? |
| A. | Electrical pump |
| B. | Reciprocating pump |
| C. | Heat pump |
| D. | Pressure pump View Answer |
| Answer» B. Reciprocating pump | |
| 363. | Corrosion in the pump is developed due to |
| A. | Pressure of air |
| B. | Fluid properties |
| C. | Draft tube |
| D. | Tank dimensions View Answer |
| Answer» B. Fluid properties | |
| 364. | What is the effect of cavitation in boat propeller? |
| A. | It recirculates air |
| B. | The pressurizes the air |
| C. | It leads to fast spinning |
| D. | It breaks the bubbles View Answer |
| Answer» C. It leads to fast spinning | |
| 365. | The energy usage of a pump is determined by |
| A. | Adiabatic expansion |
| B. | Power required |
| C. | Adiabatic compression |
| D. | Isentropic expansion View Answer |
| Answer» B. Power required | |
| 366. | For an oil field to have solid control, it needs |
| A. | Draft tubes |
| B. | Throttle bush |
| C. | Stuffing box |
| D. | Centrifugal pumps View Answer |
| Answer» D. Centrifugal pumps View Answer | |
| 367. | If we lower the temperature, the water pump cavitation |
| A. | Increases |
| B. | Decreases |
| C. | Same |
| D. | Independent View Answer |
| Answer» B. Decreases | |
| 368. | Which among the following is not a centrifugal pump? |
| A. | Sand pumps |
| B. | Froth pumps |
| C. | Slurry pumps |
| D. | Energy pumps View Answer |
| Answer» D. Energy pumps View Answer | |
| 369. | Centrifugal pumps work under the same principle, but differ in their |
| A. | Working |
| B. | Functions |
| C. | Dimensions |
| D. | Impeller View Answer |
| Answer» B. Functions | |
| 370. | If we raise the liquid level in the suction vessel, cavitation |
| A. | Increases |
| B. | Decreases |
| C. | Same |
| D. | Independent View Answer |
| Answer» B. Decreases | |
| 371. | Magnetic coupled pumps are also called as |
| A. | Series pumps |
| B. | Parallel pumps |
| C. | Froth pumps |
| D. | Drive pumps View Answer |
| Answer» D. Drive pumps View Answer | |
| 372. | When we change the pump, the cavitation |
| A. | Increases |
| B. | Decreases |
| C. | Same |
| D. | Independent View Answer |
| Answer» B. Decreases | |
| 373. | If we reduce the motor rpm in an impeller, cavitation |
| A. | Increases |
| B. | Decreases |
| C. | Same |
| D. | Independent View Answer |
| Answer» B. Decreases | |
| 374. | Decreasing the diameter of the eye of the impeller, cavitation |
| A. | Increases |
| B. | Decreases |
| C. | Same |
| D. | Independent View Answer |
| Answer» A. Increases | |
| 375. | There will be leakage only if there is |
| A. | High pressure |
| B. | High temperature |
| C. | Froths are generated |
| D. | Casing breakage View Answer |
| Answer» D. Casing breakage View Answer | |
| 376. | When a pump casing is filled with liquid before it is started, it is called as |
| A. | Adiabatic expansion |
| B. | Priming |
| C. | Adiabatic compression |
| D. | Isentropic expansion View Answer |
| Answer» B. Priming | |
| 377. | The pump will become incapable of pumping in case of |
| A. | Gas bounding |
| B. | Throttle bush |
| C. | Stuffing box |
| D. | Casing breakage View Answer |
| Answer» D. Casing breakage View Answer | |
| 378. | Priming is needed when impeller cannot impart enough |
| A. | Draft speed |
| B. | Energy |
| C. | Pressure |
| D. | Heat View Answer |
| Answer» B. Energy | |
| 379. | Priming performs response using |
| A. | Stimulus |
| B. | Froth |
| C. | Slurry |
| D. | Heat View Answer |
| Answer» A. Stimulus | |
| 380. | To avoid gas bounding, the pump is |
| A. | Heated |
| B. | Elevated |
| C. | Primed |
| D. | Charged View Answer |
| Answer» C. Primed | |
| 381. | Centrifugal pumps are located the level of source |
| A. | Below |
| B. | Above |
| C. | Parallel with |
| D. | Series with View Answer |
| Answer» A. Below | |
| 382. | A pump that can evacuate air is called as |
| A. | Series pumps |
| B. | Self priming pumps |
| C. | Froth pumps |
| D. | Drive pumps View Answer |
| Answer» B. Self priming pumps | |
| 383. | What does CPO stand for? |
| A. | Centrifugal pump operation |
| B. | Centrifugal part operation |
| C. | Centrifugal pump output |
| D. | Centrifugal part output View Answer |
| Answer» A. Centrifugal pump operation | |
| 384. | Self priming pumps overshadow the function of |
| A. | Self auxiliary device |
| B. | Wear rate |
| C. | Corrosion device |
| D. | Cavitation device View Answer |
| Answer» A. Self auxiliary device | |
| 385. | What is necessary for self priming to take place? |
| A. | Draft tube |
| B. | Pump casing |
| C. | Suspended solenoids |
| D. | Turbine head View Answer |
| Answer» B. Pump casing | |
| 386. | Centrifugal pumps with an internal suction stage are called as |
| A. | Series pumps |
| B. | Self priming pumps |
| C. | Froth pumps |
| D. | Drive pumps View Answer |
| Answer» B. Self priming pumps | |
| 387. | During normal working operation, the pump works like |
| A. | Centrifugal pumps |
| B. | Self priming pumps |
| C. | Froth pumps |
| D. | Drive pumps View Answer |
| Answer» A. Centrifugal pumps | |
| 388. | What is purpose of vent valve in a pump? |
| A. | High pressure control |
| B. | High temperature control |
| C. | Froths are generated can be minimized |
| D. | To prevent siphon action View Answer |
| Answer» D. To prevent siphon action View Answer | |
| 389. | In hydraulic head, NPSH is used for the analysis of |
| A. | Adiabatic expansion |
| B. | Priming |
| C. | Wear |
| D. | Cavitation View Answer |
| Answer» D. Cavitation View Answer | |
| 390. | NPSH is the difference between |
| A. | Suction pressure and vapour pressure |
| B. | Vapour pressure and suction pressure |
| C. | Suction pressure and heat |
| D. | Shaft and head View Answer |
| Answer» A. Suction pressure and vapour pressure | |
| 391. | What can NPSH be used to determine |
| A. | Friction characteristics |
| B. | Pipe diameter |
| C. | Cavitation |
| D. | Thermal expansion View Answer |
| Answer» C. Cavitation | |
| 392. | The measure of how close the fluid is to the given point is called |
| A. | Flashing |
| B. | Darcy’s factor |
| C. | Transfer temperature |
| D. | Heizenberg’s factor View Answer |
| Answer» A. Flashing | |
| 393. | NPSH is relevant |
| A. | Outside the pumps |
| B. | Inside the pumps |
| C. | Away from the pumps |
| D. | Series and parallel with the pumps View Answer |
| Answer» A. Outside the pumps | |
| 394. | With the increase in cavitation, the drag coefficient of the impeller |
| A. | Increases |
| B. | Decreases |
| C. | Same |
| D. | Independent View Answer |
| Answer» A. Increases | |
| 395. | What is positive suction head? |
| A. | Draft tube is above |
| B. | Pump pressure is above |
| C. | Liquid level is above |
| D. | Turbine head is above View Answer |
| Answer» C. Liquid level is above | |
| 396. | NPSHr is determined by using |
| A. | Pump pressure |
| B. | PumpLinx |
| C. | Heat transfer |
| D. | Chemical energy View Answer |
| Answer» B. PumpLinx | |
| 397. | If we use two lower capacity pumps in parallel, cavitation |
| A. | Increases |
| B. | Decreases |
| C. | Same |
| D. | Independent View Answer |
| Answer» B. Decreases | |
| 398. | The characteristic curves of a centrifugal pump, plots required by the pump. |
| A. | Velocity |
| B. | Pressure |
| C. | NPSH |
| D. | Velocity and pressure View Answer |
| Answer» C. NPSH | |
| 399. | Which among the following is not a characteristic curve for centrifugal pump? |
| A. | Transfer speed vs Transfer pressure |
| B. | Head vs Flow rate |
| C. | Power input vs pump efficiency |
| D. | Specific speed vs pump efficiency View Answer |
| Answer» A. Transfer speed vs Transfer pressure | |
| 400. | The consequence of Newtons second law is |
| A. | Conservation of angular momentum |
| B. | Conservation of mass |
| C. | Conservation of potential energy |
| D. | Conservation of kinetic energy View Answer |
| Answer» A. Conservation of angular momentum | |
| 401. | Which of the following is taken into account during a characteristic curve? |
| A. | Flow rate |
| B. | Cavitation |
| C. | Tolerances |
| D. | Casing View Answer |
| Answer» A. Flow rate | |
| 402. | As the specific speed increases, the slope of HQ curve |
| A. | Decreases |
| B. | Increases |
| C. | Independent |
| D. | Remains the same View Answer |
| Answer» C. Independent | |
| 403. | The primary selection tool is called as |
| A. | Pump curve |
| B. | Speed curve |
| C. | Power curve |
| D. | Fluid curve View Answer |
| Answer» A. Pump curve | |
| 404. | Voids are created due to |
| A. | Reaction ratio |
| B. | Pressure ratio |
| C. | Liquid free layers |
| D. | Volumetric layers View Answer |
| Answer» C. Liquid free layers | |
| 405. | Cavitation usually occurs due to the changes in |
| A. | Pressure |
| B. | Temperature |
| C. | Volume |
| D. | Heat View Answer |
| Answer» A. Pressure | |
| 406. | Degree of reactions are most commonly used in |
| A. | Turbomachinery |
| B. | Pressure drag |
| C. | Aerodynamics |
| D. | Automobiles View Answer |
| Answer» A. Turbomachinery | |
| 407. | At high pressure, the voids can generate |
| A. | Drag force |
| B. | Mass density |
| C. | Shock waves |
| D. | Flow speed View Answer |
| Answer» C. Shock waves | |
| 408. | Voids that implode near metal surface develops a |
| A. | Drag force |
| B. | Cyclic stress |
| C. | Shock waves |
| D. | Flow speed View Answer |
| Answer» B. Cyclic stress | |
| 409. | Internal cavitation occurs due to |
| A. | Drag force |
| B. | Cyclic stress |
| C. | Shock waves |
| D. | Flow speed View Answer |
| Answer» C. Shock waves | |
| 410. | The velocities of the blade angles can be found out using |
| A. | Mach number |
| B. | Froude’s number |
| C. | Velocity triangles |
| D. | Reynolds number View Answer |
| Answer» C. Velocity triangles | |
| 411. | Hydrodynamic cavitation is due to the process of |
| A. | Vaporisation |
| B. | Sedimentation |
| C. | Filtration |
| D. | Excavation View Answer |
| Answer» A. Vaporisation | |
| 412. | The process of bubble generation leads to |
| A. | High temperatures |
| B. | High pressures |
| C. | High energy densities |
| D. | High volumetric ratio View Answer |
| Answer» C. High energy densities | |
| 413. | Reciprocating pump is a |
| A. | Negative displacement pump |
| B. | Positive displacement pump |
| C. | Diaphragm pump |
| D. | Emulsion pump |
| Answer» B. Positive displacement pump | |
| 414. | What happens to the reciprocating pump when left untouched? |
| A. | Efficiency decreases |
| B. | Wear and tear |
| C. | Surface expansion |
| D. | Pressure change |
| Answer» C. Surface expansion | |
| 415. | Reciprocating pumps operate by drawing into the chamber |
| A. | Liquid |
| B. | Pressure |
| C. | Heat |
| D. | Electricity |
| Answer» A. Liquid | |
| 416. | The cylinder of reciprocating cylinder is made up of |
| A. | Cast iron |
| B. | Wrought iron |
| C. | Aluminium |
| D. | Copper View Answer |
| Answer» A. Cast iron | |
| 417. | The higher discharge valve line holds the discharge valve |
| A. | Open |
| B. | Closed |
| C. | Stop functioning |
| D. | Automatic View Answer |
| Answer» B. Closed | |
| 418. | Reciprocating pumps are also called as |
| A. | Force pumps |
| B. | Mass Pumps |
| C. | Heat pumps |
| D. | Speed pumps View Answer |
| Answer» A. Force pumps | |
| 419. | Reciprocating pumps are classified according to |
| A. | Drag force |
| B. | Number of cylinders |
| C. | Shock waves |
| D. | Flow speed View Answer |
| Answer» B. Number of cylinders | |
| 420. | Simple hand operating pump is also called as |
| A. | Froth pump |
| B. | Bicycle pump |
| C. | Multistage pumps |
| D. | Centrifugal pumps View Answer |
| Answer» B. Bicycle pump | |
| 421. | Power operated pump in which only one side engages the fluid displacement is called |
| A. | Froth pump |
| B. | Single acting |
| C. | Double acting |
| D. | Bicycle pump View Answer |
| Answer» B. Single acting | |
| 422. | Operation of reciprocating motion is done by a source |
| A. | Power |
| B. | Energy |
| C. | Momentum |
| D. | Inertia View Answer |
| Answer» A. Power | |
| 423. | An up and down back and forth relative linear motion is called |
| A. | Reciprocation |
| B. | Rotation |
| C. | Filtration |
| D. | Excavation View Answer |
| Answer» A. Reciprocation | |
| 424. | Power operated pump in which only both sides engage the fluid displacement is called |
| A. | Froth pump |
| B. | Single acting |
| C. | Double acting |
| D. | Bicycle pump View Answer |
| Answer» C. Double acting | |
| 425. | The two opposite motion that comprise a single reciprocation is called |
| A. | Turbocharger |
| B. | Stokes |
| C. | Fluid motion |
| D. | Auto motion View Answer |
| Answer» A. Turbocharger | |
| 426. | Reciprocating pumps has efficiency compared to centrifugal pumps |
| A. | Higher |
| B. | Lower |
| C. | Equal |
| D. | Exponential View Answer |
| Answer» B. Lower | |
| 427. | Reciprocating pumps works on the principle of |
| A. | Drag force |
| B. | Liquid flow push |
| C. | Shock waves |
| D. | Flow speed View Answer |
| Answer» B. Liquid flow push | |
| 428. | Reciprocating pump is a type of |
| A. | Positive displacement pump |
| B. | Bicycle pump |
| C. | Multistage pumps |
| D. | Centrifugal pumps View Answer |
| Answer» A. Positive displacement pump | |
| 429. | During the suction stroke the moves left thus creating vacuum in the Cylinder. |
| A. | Piston |
| B. | Cylinder |
| C. | Valve |
| D. | Pump View Answer |
| Answer» A. Piston | |
| 430. | When both the sources are effective it is called as |
| A. | Double acting pump |
| B. | Single acting pump |
| C. | Triple acting pump |
| D. | Normal pump View Answer |
| Answer» A. Double acting pump | |
| 431. | A repetitive variation about the central value of equilibrium is called |
| A. | Reciprocation |
| B. | Oscillation |
| C. | Filtration |
| D. | Excavation View Answer |
| Answer» B. Oscillation | |
| 432. | A linear wheel turning motion is called as a |
| A. | Reciprocation |
| B. | Rotation |
| C. | Oscillation |
| D. | Bicycle pump View Answer |
| Answer» B. Rotation | |
| 433. | A reciprocating pump that has 1200 crank is |
| A. | Froth pump |
| B. | Single acting |
| C. | Double acting |
| D. | Triple acting View Answer |
| Answer» D. Triple acting View Answer | |
| 434. | In a positive displacement pump, what gets displaced? |
| A. | Fluid |
| B. | Volume |
| C. | Pressure |
| D. | Temperature View Answer |
| Answer» B. Volume | |
| 435. | What happens to the reciprocating pump when left untouched? |
| A. | Efficiency decreases |
| B. | Wear and tear |
| C. | Surface expansion |
| D. | Pressure change View Answer |
| Answer» C. Surface expansion | |
| 436. | Positive displacement pumps are capable of developing pressures, in suction pressure. |
| A. | High, low |
| B. | Low, high |
| C. | High, high |
| D. | Low, low View Answer |
| Answer» A. High, low | |
| 437. | When is a reciprocating pump used? |
| A. | When quantity of liquid is small |
| B. | When quantity of liquid is large |
| C. | To pump high pressure |
| D. | To pump low pressure View Answer |
| Answer» A. When quantity of liquid is small | |
| 438. | Positive displacement pumps are also called as_ |
| A. | Constant pressure pump |
| B. | Pressure drag pumps |
| C. | Constant volume pumps |
| D. | Constant head pumps View Answer |
| Answer» C. Constant volume pumps | |
| 439. | In centrifugal pumps, their capacity is affected due to |
| A. | Drag force |
| B. | Cyclic stress |
| C. | Shock waves |
| D. | Pressure View Answer |
| Answer» D. Pressure View Answer | |
| 440. | A quantity of fluid that leaks from a higher pressure discharge to a lower pressure discharge is called |
| A. | Slip |
| B. | Heat |
| C. | Friction |
| D. | Enthalpy View Answer |
| Answer» A. Slip | |
| 441. | Positive displacement pumps regulate the flow by varying its |
| A. | Drag force |
| B. | Cyclic stress |
| C. | Shock waves |
| D. | Flow speed View Answer |
| Answer» D. Flow speed View Answer | |
| 442. | Simplest example of single acting reciprocating pump is |
| A. | Mineral ores |
| B. | Whirl wheels |
| C. | Bicycle tires |
| D. | Syringe View Answer |
| Answer» D. Syringe View Answer | |
| 443. | Rotary pumps do not function well under |
| A. | High Vaporisation |
| B. | High Sedimentation |
| C. | High viscosity |
| D. | Excavation View Answer |
| Answer» C. High viscosity | |
| 444. | The parameter that disturbs the working of the rotary pump is_ |
| A. | High Vaporisation |
| B. | High Sedimentation |
| C. | Low flow rate |
| D. | Excavation View Answer |
| Answer» C. Low flow rate | |
| 445. | Rotary pumps are commonly used to circulate_ |
| A. | Lube oils |
| B. | Petroleum |
| C. | Diesel |
| D. | Water View Answer |
| Answer» A. Lube oils | |
| 446. | Capacity of a rotary pump is defined as |
| A. | Total liquid displaced |
| B. | Overall performance of pump |
| C. | Maximum fluid flow |
| D. | Minimum fluid flow View Answer |
| Answer» A. Total liquid displaced | |
| 447. | What type of flow does the reciprocating pump have? |
| A. | Uniform |
| B. | Continuous |
| C. | Pulsating |
| D. | Non-uniform View Answer |
| Answer» B. Continuous | |
| 448. | What is the full form of PD? |
| A. | Positive displacement |
| B. | Pump displacement |
| C. | Plunger displacement |
| D. | Plunger direct View Answer |
| Answer» A. Positive displacement | |
| 449. | Why can’t rotary pumps non-lubricate water? |
| A. | Because it has lesser viscosity |
| B. | Because it contains abrasive particles |
| C. | Multistage pumps are difficult to operate |
| D. | Draft tube is thin View Answer |
| Answer» B. Because it contains abrasive particles | |
| 450. | The maximum speed of reciprocating pump is |
| A. | 20m/min |
| B. | 30m/min |
| C. | 40m/min |
| D. | 50m/min View Answer |
| Answer» B. 30m/min | |
| 451. | The pump that uses a relatively smaller amount of liquid is called |
| A. | Froth pump |
| B. | Reciprocating pump |
| C. | Double acting |
| D. | Bicycle pump View Answer |
| Answer» B. Reciprocating pump | |
| 452. | Sliding vanes in pumps are held by |
| A. | Draft pins |
| B. | Whirl wheels |
| C. | Springs |
| D. | Nails View Answer |
| Answer» C. Springs | |
| 453. | Air vessel accumulates excess quantity of |
| A. | Vapor |
| B. | Water |
| C. | Heat |
| D. | Pressure View Answer |
| Answer» B. Water | |
| 454. | In which pump is the liquid in contact with both the sides of the plunger |
| A. | Froth pump |
| B. | Single acting |
| C. | Double acting |
| D. | Bicycle pump View Answer |
| Answer» C. Double acting | |
| 455. | When a cylinder has inlet and outlet ports at each end, then it is called as |
| A. | Double acting |
| B. | Air lift pumps |
| C. | Reciprocating pumps |
| D. | Centrifugal pumps View Answer |
| Answer» A. Double acting | |
| 456. | Turbomachines work under |
| A. | Newtons first law |
| B. | Newtons second law |
| C. | Newtons third law |
| D. | Kepler’s law View Answer |
| Answer» B. Newtons second law | |
| 457. | The main function of nozzle is to |
| A. | Varying temperatures |
| B. | Pressure variations |
| C. | Load variations |
| D. | Heat variations View Answer |
| Answer» B. Pressure variations | |
| 458. | When the piston moves forward, liquid is drawn |
| A. | Into the cylinder |
| B. | Away from the cylinder |
| C. | Into the draft tube |
| D. | Away from the draft tube View Answer |
| Answer» A. Into the cylinder | |
| 459. | In a reciprocating pump, with the change in discharge pressure, |
| A. | The Volume delivered increases |
| B. | The volume delivered decreases |
| C. | Volume delivered remains the same |
| D. | Volume delivered is independent View Answer |
| Answer» C. Volume delivered remains the same | |
| 460. | The amount of fluid that leaks internally is called |
| A. | Head race |
| B. | Slip |
| C. | Tail race |
| D. | Internal friction View Answer |
| Answer» B. Slip | |
| 461. | For a good condition, slip should be_ |
| A. | Below 1 percent |
| B. | 1 to 2 percent |
| C. | 3 to 4 percent |
| D. | Above 5 percent View Answer |
| Answer» A. Below 1 percent | |
| 462. | If the slip is above 5 percent, the pumps needs to be |
| A. | Dragged |
| B. | Overhauled |
| C. | Retracted |
| D. | Intermittent View Answer |
| Answer» B. Overhauled | |
| 463. | Slip in a pump depends on which of following parameters? |
| A. | Wear |
| B. | Pressure |
| C. | Temperature |
| D. | Heat View Answer |
| Answer» A. Wear | |
| 464. | Internal breakage in a pump mainly takes place when |
| A. | Discharge pressure is increased |
| B. | Temperature is increased |
| C. | Heat leads to expansion |
| D. | Corrosion takes place View Answer |
| Answer» A. Discharge pressure is increased | |
| 465. | The output that we get after an internal breakage can be classed as |
| A. | An increase |
| B. | A decrease |
| C. | Constant |
| D. | An independent variable View Answer |
| Answer» C. Constant | |
| 466. | When the hydraulic fluid forms on only one side of the piston, it is called |
| A. | Single acting pump |
| B. | Double acting pump |
| C. | Froth pump |
| D. | Draft tube View Answer |
| Answer» A. Single acting pump | |
| 467. | A pump with two steams and two water cylinders is called |
| A. | Single acting pump |
| B. | Double acting pump |
| C. | Froth pump |
| D. | Duplex pump View Answer |
| Answer» D. Duplex pump View Answer | |
| 468. | When an external force is not available in a pump, we use a |
| A. | Hydraulic cylinder |
| B. | Slip gauge |
| C. | Tail race |
| D. | Heater View Answer |
| Answer» A. Hydraulic cylinder | |
| 469. | Reciprocating pumps give a flow |
| A. | Uniform |
| B. | Non- uniform |
| C. | Pulsating |
| D. | Sinusoidal View Answer |
| Answer» C. Pulsating | |
| 470. | Suction stroke becomes difficult to pump |
| A. | High temperature fluids |
| B. | Viscous fluids |
| C. | Fluids with abrasives |
| D. | High velocity fluids View Answer |
| Answer» B. Viscous fluids | |
| 471. | Piston pumps are very |
| A. | Expensive |
| B. | Cheap |
| C. | Reasonable |
| D. | Intricate View Answer |
| Answer» A. Expensive | |
| 472. | What is the full form of DAC? |
| A. | Digital Acting pumps |
| B. | Double acting pumps |
| C. | Data acting pumps |
| D. | Draft tube pumps View Answer |
| Answer» B. Double acting pumps | |
| 473. | Which among the following is not a multi-cylinder pump? |
| A. | Double acting simplex |
| B. | Single acting duplex |
| C. | Double acting duplex |
| D. | Single acting triplex View Answer |
| Answer» A. Double acting simplex | |
| 474. | A pressure vessel is used to hold |
| A. | Air |
| B. | Gases |
| C. | Molecules |
| D. | Solids View Answer |
| Answer» B. Gases | |
| 475. | A tank that is used to protect closed water heating systems is called |
| A. | Pressure vessel |
| B. | Expansion vessel |
| C. | Heat vessel |
| D. | Auto vessel View Answer |
| Answer» B. Expansion vessel | |
| 476. | How is the construction of the vessel tested? |
| A. | Uniform testing |
| B. | Continuous testing |
| C. | Pulsating test |
| D. | Non-destructive testing View Answer |
| Answer» D. Non-destructive testing View Answer | |
| 477. | Where is the excess quantity of water from the pump accumulated? |
| A. | Froth tube |
| B. | Draft tube |
| C. | Air vessels |
| D. | Bicycle pump View Answer |
| Answer» C. Air vessels | |
| 478. | What is the shape of a pressure vessel? |
| A. | Square |
| B. | Spheres |
| C. | Cones |
| D. | All the shapes View Answer |
| Answer» D. All the shapes View Answer | |
| 479. | Pressure vessel closures are used to |
| A. | Avoid breakage |
| B. | Avoid leakage |
| C. | Retain structures |
| D. | Maintain pressure View Answer |
| Answer» C. Retain structures | |
Chapter: Turbine
| 480. | The main function of nozzle is to |
| A. | Varying temperatures |
| B. | Pressure variations |
| C. | Load variations |
| D. | Heat variations |
| Answer» B. Pressure variations | |
| 481. | Which among the following control the flow rate? |
| A. | Valve |
| B. | Pump |
| C. | Head |
| D. | Tank pipe |
| Answer» A. Valve | |
| 482. | Force exerted by a jet on a stationery plate happens in how many cases? |
| A. | 3 cases |
| B. | 2 cases |
| C. | 1 case |
| D. | Nil |
| Answer» A. 3 cases | |
| 483. | Force exerted by a jet on a moving plate happens in how many cases? |
| A. | 3 cases |
| B. | 2 cases |
| C. | 1 case |
| D. | Nil |
| Answer» A. 3 cases | |
| 484. | In a stationery vertical plate, the jet after striking the plate will move |
| A. | In opposite direction |
| B. | Along the plate |
| C. | Perpendicular to the plate |
| D. | Parallel to the plate |
| Answer» B. Along the plate | |
| 485. | At what angle does the jet deflect after striking a stationery vertical plate? |
| A. | 30 |
| B. | 60 |
| C. | 90 |
| D. | 0 |
| Answer» C. 90 | |
| 486. | The velocity component after striking the surface will be_ |
| A. | One |
| B. | Zero |
| C. | Infinity |
| D. | Negative |
| Answer» B. Zero | |
| 487. | Which among the following is the formula for Force when it strikes the plate? |
| A. | pav2 |
| B. | pav |
| C. | pa |
| D. | maE |
| Answer» A. pav2 | |
| 488. | To derive pav2, we take final velocity minus the initial velocity. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» B. False | |
| 489. | The mass of water per sec striking the plate is |
| A. | pav2 |
| B. | pav |
| C. | pa |
| D. | maE |
| Answer» B. pav | |
| 490. | Which among the following is formula for force when it acts along the direction of flow? |
| A. | pav2Sin2θ |
| B. | pav Sin2θ |
| C. | pa Sin2θ |
| D. | maE Sin2θ |
| Answer» A. pav2Sin2θ | |
| 491. | Which among the following is a formula for force when it acts perpendicular to the direction of flow? |
| A. | pav2 SinθCosθ |
| B. | pav Sin2θ |
| C. | pa Sin2θ |
| D. | maE Sin2θ |
| Answer» A. pav2 SinθCosθ | |
| 492. | A jet strikes a curved plate at its |
| A. | Sides |
| B. | Surface |
| C. | Centre |
| D. | Does not strike |
| Answer» C. Centre | |
| 493. | During a weak jump, the value of Froude lies in between |
| A. | 1 to 2.5 |
| B. | 2.5 to 3.5 |
| C. | Less than 1 |
| D. | Zero |
| Answer» A. 1 to 2.5 | |
| 494. | During an oscillating jump, the value of Froude lies in between |
| A. | 1 to 2.5 |
| B. | 2.5 to 4.5 |
| C. | Less than 1 |
| D. | Zero |
| Answer» A. 1 to 2.5 | |
| 495. | A jet after striking a smooth plate comes out with a velocity. |
| A. | Increased |
| B. | Decreased |
| C. | Same |
| D. | Zero |
| Answer» C. Same | |
| 496. | Component of velocity in direction of jet is -VCosθ |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 497. | Jet propulsion is a method of generating propulsive force by reaction of |
| A. | Accelerating mass |
| B. | Volume |
| C. | Mass flow rate |
| D. | Velocity |
| Answer» A. Accelerating mass | |
| 498. | The propulsive force drives the jet in the |
| A. | Backward direction |
| B. | Forward direction |
| C. | Perpendicular direction |
| D. | Parallel movement |
| Answer» B. Forward direction | |
| 499. | Jet propulsion works on the principle of |
| A. | Newton’s first law |
| B. | Newton’s second law |
| C. | Newton’s third law |
| D. | Thermodynamic properties |
| Answer» C. Newton’s third law | |
| 500. | What does Cv in jet propulsion equation stand for? |
| A. | Area of orifice |
| B. | Velocity |
| C. | Temperature coefficient |
| D. | Velocity coefficient |
| Answer» D. Velocity coefficient | |
| 501. | The movement of ships and boats in water is due to |
| A. | Water currents |
| B. | Jet propulsion |
| C. | Mass flow rate |
| D. | Volumetric changes |
| Answer» B. Jet propulsion | |
| 502. | The inlet orifices are at what angle with the motion of the ship? |
| A. | 0 |
| B. | 30 |
| C. | 60 |
| D. | 90 |
| Answer» D. 90 | |
| 503. | Which among the following is a formula for force when it acts perpendicular to the direction of flow? |
| A. | pav2 SinθCosθ |
| B. | pav Sin2 θ |
| C. | pa Sin2 θ |
| D. | maE Sin2 θ |
| Answer» A. pav2 SinθCosθ | |
| 504. | Which among the following is the formula for relative velocity? |
| A. | V + u |
| B. | Vu |
| C. | V – u |
| D. | V/u |
| Answer» A. V + u | |
| 505. | Component of velocity in direction of jet is -VCosθ. What does ‘θ’ indicate? |
| A. | Angle made by jet |
| B. | Angle made by jet and outlet tip |
| C. | Angle made by jet and inlet tip |
| D. | Tangent angle |
| Answer» C. Angle made by jet and inlet tip | |
| 506. | Principle of fluid mechanics works on the utilization of |
| A. | Accelerating mass |
| B. | Volume |
| C. | Work |
| D. | Velocity |
| Answer» C. Work | |
| 507. | The force analysis on a curved vane is understood using |
| A. | Velocity triangles |
| B. | Angle of the plate |
| C. | Vane angles |
| D. | Plate dimensions |
| Answer» A. Velocity triangles | |
| 508. | How is absolute velocity at inlet denoted? |
| A. | V |
| B. | V1 |
| C. | C |
| D. | v |
| Answer» B. V1 | |
| 509. | The relative velocity is obtained by the equation |
| A. | u – V1 |
| B. | V1 |
| C. | u*V1 |
| D. | u/V1 |
| Answer» A. u – V1 | |
| 510. | If the friction is neglected, then |
| A. | Vr1 > Vr2 |
| B. | Vr1 < Vr2 |
| C. | Vr1 = Vr2 |
| D. | Vr1 is a zero |
| Answer» C. Vr1 = Vr2 | |
| 511. | If the pressure remains a constant, then |
| A. | Vr1 > Vr2 |
| B. | Vr1 < Vr2 |
| C. | Vr1 = Vr2 |
| D. | Vr1 is a zero |
| Answer» C. Vr1 = Vr2 | |
| 512. | Jet propulsion of ship is less efficient than screw propeller due to |
| A. | Pressure |
| B. | Temperature |
| C. | Frictional losses |
| D. | Wear and tear |
| Answer» C. Frictional losses | |
| 513. | Jet propulsion of ship in a very shallow water is needed to |
| A. | Avoid sinking of the ship |
| B. | Avoid damage of the propeller |
| C. | Avoid current directions |
| D. | Avoid surface damage |
| Answer» B. Avoid damage of the propeller | |
| 514. | A turbojet does not consist of which of the following component? |
| A. | Compressor |
| B. | Combustion chamber |
| C. | Gas turbine |
| D. | Air filter |
| Answer» D. Air filter | |
| 515. | Which among the following is not a type of jet engine? |
| A. | Turbojet |
| B. | Ramjet |
| C. | Scramjet |
| D. | Propulsive jet |
| Answer» D. Propulsive jet | |
| 516. | Hydraulic energy is converted into another form of energy by hydraulic machines. What form of energy is that? |
| A. | Mechanical Energy |
| B. | Electrical Energy |
| C. | Nuclear Energy |
| D. | Elastic Energy |
| Answer» A. Mechanical Energy | |
| 517. | Which principle is used in Hydraulic Turbines? |
| A. | Faraday law |
| B. | Newton’s second law |
| C. | Charles law |
| D. | Braggs law |
| Answer» B. Newton’s second law | |
| 518. | Buckets and blades used in a turbine are used to: |
| A. | Alter the direction of water |
| B. | Switch off the turbine |
| C. | To regulate the wind speed |
| D. | To regenerate the power |
| Answer» A. Alter the direction of water | |
| 519. | is the electric power obtained from the energy of the water. |
| A. | Roto dynamic power |
| B. | Thermal power |
| C. | Nuclear power |
| D. | Hydroelectric power |
| Answer» D. Hydroelectric power | |
| 520. | Which energy generated in a turbine is used to run electric power generator linked to the turbine shaft? |
| A. | Mechanical Energy |
| B. | Potential Energy |
| C. | Elastic Energy |
| D. | Kinetic Energy |
| Answer» A. Mechanical Energy | |
| 521. | Hydraulic Machines fall under the category : |
| A. | Pulverizers |
| B. | Kinetic machinery |
| C. | Condensers |
| D. | Roto-dynamic machinery |
| Answer» D. Roto-dynamic machinery | |
| 522. | Which kind of turbines changes the pressure of the water entered through it? |
| A. | Reaction turbines |
| B. | Impulse turbines |
| C. | Reactive turbines |
| D. | Kinetic turbines |
| Answer» A. Reaction turbines | |
| 523. | Which type of turbine is used to change the velocity of the water through its flow? |
| A. | Kinetic turbines |
| B. | Axial flow turbines |
| C. | Impulse turbines |
| D. | Reaction turbines |
| Answer» C. Impulse turbines | |
| 524. | Which type of turbine is a Francis Turbine? |
| A. | Impulse Turbine |
| B. | Screw Turbine |
| C. | Reaction turbine |
| D. | Turgo turbine |
| Answer» C. Reaction turbine | |
| 525. | How many types of Reaction turbines are there? |
| A. | 5 |
| B. | 4 |
| C. | 3 |
| D. | 9 |
| Answer» A. 5 | |
| 526. | Maximum Number of jets, generally, employed in an impulse turbine without jet interference can be? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 6 |
| Answer» D. 6 | |
| 527. | The overall efficiency of a reaction turbine is the ratio of |
| A. | Actual work available at the turbine to the energy imparted to the wheel |
| B. | Work done on the wheel to the energy (or head of water) actually supplied to the turbine |
| C. | Power produced by the turbine to the energy actually supplied by the turbine |
| D. | Actual work available at the turbine to energy imparted to the wheel |
| Answer» A. Actual work available at the turbine to the energy imparted to the wheel | |
| 528. | In a reaction turbine, the draft tube is used to |
| A. | To increase the head of water by an amount that is equal to the height of the runner outlet above the tail race |
| B. | To prevent air to enter the turbine |
| C. | To increase pressure energy of water |
| D. | To transport water to downstream |
| Answer» A. To increase the head of water by an amount that is equal to the height of the runner outlet above the tail race | |
| 529. | In reaction turbine hydraulic efficiency is_ |
| A. | Ratio of actual work at the turbine to the energy imparted to the wheel. |
| B. | Ratio of work done on the wheel to energy that is supplied to the turbine. |
| C. | Ratio of power produced by the turbine to the energy actually supplied by the turbine. |
| D. | Ratio of Work done on the wheel to the energy (or head of water) actually supplied to the turbine. |
| Answer» B. Ratio of work done on the wheel to energy that is supplied to the turbine. | |
| 530. | Consider an inward flow reaction turbine, here, water |
| A. | Flows parallel to the axis of the wheel |
| B. | Enters the wheel at the outer periphery and then flows towards the centre of the wheel |
| C. | Flow is partly radial and partly axial |
| D. | Enters at the centre of the wheel and then flows towards the outer periphery of the wheel |
| Answer» B. Enters the wheel at the outer periphery and then flows towards the centre of the wheel | |
| 531. | The working of which of the following hydraulic units is based on Pascal’s law? |
| A. | Air lift pump |
| B. | Hydraulic coupling |
| C. | Hydraulic press |
| D. | Jet pump |
| Answer» C. Hydraulic press | |
| 532. | Which kind of turbine is a Pelton Wheel turbine? |
| A. | Tangential flow turbine. |
| B. | Radial flow turbine |
| C. | Outward flow turbine |
| D. | Inward flow turbine |
| Answer» A. Tangential flow turbine. | |
| 533. | IN what type of turbine water enters in radial direction and leaves axial direction? |
| A. | Tangential flow turbine |
| B. | Axial flow turbine |
| C. | Outward flow turbine |
| D. | Mixed flow turbine |
| Answer» D. Mixed flow turbine | |
| 534. | How many types of turbines can you classify on the basis of direction of flow through runner? |
| A. | 6 |
| B. | 3 |
| C. | 4 |
| D. | 7 |
| Answer» C. 4 | |
| 535. | Into how many types can you classify radial flow turbines? |
| A. | 4 |
| B. | 3 |
| C. | 6 |
| D. | 2 |
| Answer» D. 2 | |
| 536. | Into how many types can you classify turbines on basis of head at inlet? |
| A. | 3 |
| B. | 4 |
| C. | 6 |
| D. | 5 |
| Answer» A. 3 | |
| 537. | Among the following which turbine requires more head? |
| A. | Pelton Turbine |
| B. | Kaplan Turbine |
| C. | Francis turbine |
| D. | Tube Turbine |
| Answer» A. Pelton Turbine | |
| 538. | Total head of turbines is_ |
| A. | Pressure head + Static head |
| B. | Kinetic head + Static head |
| C. | Static head + Pressure head |
| D. | Pressure head + Kinetic head + Static head |
| Answer» D. Pressure head + Kinetic head + Static head | |
| 539. | Head under which Kaplan turbine is operated |
| A. | 10-70 meters |
| B. | 70 -100 meters |
| C. | 100-200 meters |
| D. | Above 200 meters |
| Answer» A. 10-70 meters | |
| 540. | Head under which Francis turbine is operated |
| A. | 10-70 meters |
| B. | 70-100 meters |
| C. | 100-200 meters |
| D. | 40 -600 meters |
| Answer» D. 40 -600 meters | |
| 541. | The turbine is preferred for 0 to 25 m head of water? |
| A. | Pelton wheel |
| B. | Kaplan turbine |
| C. | Tube turbine |
| D. | Francis turbine |
| Answer» B. Kaplan turbine | |
| 542. | Under what head is Pelton turbine operated? |
| A. | 20-50 meters |
| B. | 15-2000 meters |
| C. | 60-200 meters |
| D. | 50-500 meters |
| Answer» B. 15-2000 meters | |
| 543. | is difference between head race and tail race |
| A. | Gross head |
| B. | Net head |
| C. | Net positive suction head |
| D. | Manometric head |
| Answer» A. Gross head | |
| 544. | The head available at inlet of turbine |
| A. | Net positive suction head |
| B. | Gross head |
| C. | Net head |
| D. | Manometric head |
| Answer» C. Net head | |
| 545. | Head lost due to friction is given by k*f*L*v*v/D*2g where f- friction coefficient, L- length of pen stock, D- diameter of penstock and” k” is constant and its value is |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 546. | The difference between gross head and friction losses is |
| A. | Net head |
| B. | Gross head |
| C. | Manometric head |
| D. | Net positive suction head |
| Answer» A. Net head | |
| 547. | is defined as ratio between power delivered to runner and power supplied at inlet of turbine. |
| A. | Mechanical efficiency |
| B. | Volumetric efficiency |
| C. | Hydraulic efficiency |
| D. | Overall efficiency |
| Answer» C. Hydraulic efficiency | |
| 548. | Which among the following which is not an efficiency of turbine? |
| A. | Mechanical efficiency |
| B. | Volumetric efficiency |
| C. | Hydraulic efficiency |
| D. | Electrical efficiency |
| Answer» D. Electrical efficiency | |
| 549. | The ratio of power at the shaft of turbine and power delivered by water to runner is known as? |
| A. | Mechanical efficiency |
| B. | Volumetric efficiency |
| C. | Hydraulic efficiency |
| D. | Overall efficiency |
| Answer» A. Mechanical efficiency | |
| 550. | The product of mechanical efficiency and hydraulic efficiency is known as? |
| A. | Mechanical efficiency |
| B. | Volumetric efficiency |
| C. | Hydraulic efficiency |
| D. | Overall efficiency |
| Answer» D. Overall efficiency | |
| 551. | Among the following which turbine has highest efficiency? |
| A. | Kaplan turbine |
| B. | Francis turbine |
| C. | Pelton turbine |
| D. | Propeller turbine |
| Answer» A. Kaplan turbine | |
| 552. | In the expression for overall efficiency of turbine, which is p/(k*g*q*h), where “k” is known as |
| A. | Density of liquid |
| B. | Specific density of liquid |
| C. | Volume of liquid |
| D. | Specific gravity of liquid |
| Answer» A. Density of liquid | |
| 553. | The expression for maximum hydraulic efficiency of pelton turbine is given by? |
| A. | (1+cos k)/2 where k is outlet blade angle |
| B. | (2+cos k)/2 where k is outlet blade angle |
| C. | (3+cos k)/2 where k is outlet blade angle |
| D. | (4+cos k)/2 where k is outlet blade angle |
| Answer» A. (1+cos k)/2 where k is outlet blade angle | |
| 554. | To obtain maximum hydraulic efficiency of pelton turbine, blade velocity should be Times the inlet velocity of jet. |
| A. | Half |
| B. | One quarter |
| C. | Twice |
| D. | Thrice |
| Answer» A. Half | |
| 555. | Among the following which turbine has least efficiency? |
| A. | Pelton turbine |
| B. | Kaplan turbine |
| C. | Francis turbine |
| D. | Propeller turbine |
| Answer» A. Pelton turbine | |
| 556. | A hydraulic coupling belongs to the category of |
| A. | Energy absorbing machines |
| B. | Energy generating machines |
| C. | Power absorbing machines |
| D. | Energy transfer machines |
| Answer» D. Energy transfer machines | |
| 557. | The electric power which is obtained from hydraulic energy |
| A. | Thermal power |
| B. | Mechanical power |
| C. | Solar power |
| D. | Hydroelectric power |
| Answer» D. Hydroelectric power | |
| 558. | At present which is cheapest means of generating power_ |
| A. | Thermal power |
| B. | Nuclear power |
| C. | Hydroelectric power |
| D. | Electric Power |
| Answer» C. Hydroelectric power | |
| 559. | Pipes of largest diameter which carry water from reservoir to the turbines is known as_ |
| A. | Head stock |
| B. | Tail race |
| C. | Tail stock |
| D. | Pen stock |
| Answer» D. Pen stock | |
| 560. | Pen stocks are made up of |
| A. | Steel |
| B. | Cast iron |
| C. | Mild steel |
| D. | Wrought iron |
| Answer» A. Steel | |
| 561. | is an inward radial flow reaction turbine? |
| A. | Pelton turbine |
| B. | Kaplan turbine |
| C. | Francis turbine |
| D. | Propeller turbine |
| Answer» C. Francis turbine | |
| 562. | The important type of axial flow reaction turbines are |
| A. | Propeller and Pelton turbines |
| B. | Kaplan and Francis turbines |
| C. | Propeller and Francis turbines |
| D. | Propeller and Kaplan turbines |
| Answer» D. Propeller and Kaplan turbines | |
| 563. | is a axial flow reaction turbines, if vanes are fixed to hub of turbine |
| A. | Propeller turbine |
| B. | Francis turbine |
| C. | Kaplan turbine |
| D. | Pelton turbine |
| Answer» A. Propeller turbine | |
| 564. | Francis and Kaplan turbines are known as |
| A. | Impulse turbine |
| B. | Reaction turbine |
| C. | Axial flow turbine |
| D. | Mixed flow turbine |
| Answer» B. Reaction turbine | |
| 565. | Specific speed of reaction turbine is between? |
| A. | 5 and 50 |
| B. | 10 and 100 |
| C. | 100 and 150 |
| D. | 150 and 300 |
| Answer» B. 10 and 100 | |
| 566. | Impulse turbine is generally fitted at |
| A. | At the level of tail race |
| B. | Above the tail race |
| C. | Below the tail race |
| D. | About 2.5mts above tail race to avoid cavitations. |
| Answer» B. Above the tail race | |
| 567. | Hydraulic turbines are classified based on |
| A. | Energy available at inlet of turbine |
| B. | Direction of flow through vanes |
| C. | Head at inlet of turbine |
| D. | Energy available, Direction of flow, Head at inlet. |
| Answer» D. Energy available, Direction of flow, Head at inlet. | |
| 568. | Impulse turbine and reaction turbine are classified based on ? |
| A. | Type of energy at inlet |
| B. | Direction of flow through runner |
| C. | Head at inlet of turbine |
| D. | Specific speed of turbine |
| Answer» A. Type of energy at inlet | |
| 569. | Tangential flow, axial flow, radial flow turbines are classified based on? |
| A. | Type of energy at inlet |
| B. | Direction of flow through runner |
| C. | Head at inlet of turbine |
| D. | Specific speed of turbine |
| Answer» B. Direction of flow through runner | |
| 570. | High head, low head and medium head turbines are classified based on |
| A. | Type of energy at inlet |
| B. | Direction of flow through runner |
| C. | Head at inlet of turbine |
| D. | Specific speed of turbine |
| Answer» C. Head at inlet of turbine | |
| 571. | Low specific speed, high specific speed and medium specific speed are classified based on |
| A. | Type of energy at inlet |
| B. | Direction of flow through runner |
| C. | Head at inlet of turbine |
| D. | Specific speed of turbine |
| Answer» D. Specific speed of turbine | |
| 572. | If energy available at inlet of turbine is only kinetic energy then it is classified based on |
| A. | Type of energy at inlet |
| B. | Direction of flow through runner |
| C. | Head at inlet of turbine |
| D. | Specific speed of turbine |
| Answer» A. Type of energy at inlet | |
| 573. | If water flows in radial direction at inlet of runner and leaves axially at outlet then turbine is named as |
| A. | Tangential flow turbine |
| B. | Axial flow turbine |
| C. | Radial flow turbine |
| D. | Mixed flow turbine |
| Answer» D. Mixed flow turbine | |
| 574. | Pelton turbine is operated under |
| A. | Low head and high discharge |
| B. | High head and low discharge |
| C. | Medium head and high discharge |
| D. | Medium head and medium discharge |
| Answer» B. High head and low discharge | |
| 575. | Kaplan turbine is operated under |
| A. | Low head and high discharge |
| B. | High head and low discharge |
| C. | Medium head and high discharge |
| D. | Medium head and medium discharge |
| Answer» A. Low head and high discharge | |
| 576. | Medium specific speed of turbine implies |
| A. | Pelton turbine |
| B. | Kaplan turbine |
| C. | Francis turbine |
| D. | Propeller turbine |
| Answer» C. Francis turbine | |
| 577. | High specific speed of turbine implies that it is_ |
| A. | Francis turbine |
| B. | Propeller turbine |
| C. | Pelton turbine |
| D. | Kaplan turbine |
| Answer» D. Kaplan turbine | |
| 578. | Velocity triangles are used to analyze |
| A. | Flow of water along blades of turbine |
| B. | Measure discharge of flow |
| C. | Angle of deflection of jet |
| D. | Flow of water, measure of discharge, angle of deflection. |
| Answer» D. Flow of water, measure of discharge, angle of deflection. | |
| 579. | In which of following turbine inlet and outlet blade velocities of vanes are equal? |
| A. | Francis turbine |
| B. | Kaplan turbine |
| C. | Pelton turbine |
| D. | Propeller turbine |
| Answer» C. Pelton turbine | |
| 580. | Tangential velocity of blade of Pelton wheel is proportional to |
| A. | Speed of wheel |
| B. | Angular velocity of wheel |
| C. | Rpm of wheel |
| D. | Speed, angular velocity, RPM of the wheel |
| Answer» A. Speed of wheel | |
| 581. | In which of following turbine inlet whirl velocity and inlet jet velocity are equal in magnitude? |
| A. | Pelton turbine |
| B. | Propeller turbine |
| C. | Kaplan turbine |
| D. | Francis turbine |
| Answer» A. Pelton turbine | |
| 582. | In Pelton wheel, if outlet velocity angle of jet is “acute angled” then outlet whirl velocity of jet is |
| A. | x- component of V(r2) – blade velocity |
| B. | x- component of V (r2) + blade velocity |
| C. | Blade velocity – x- component of V (r2) |
| D. | Zero |
| Answer» A. x- component of V(r2) – blade velocity | |
| 583. | In Pelton wheel, if outlet velocity angle of jet is “obtuseangled” then outlet whirl velocity of jet is |
| A. | x- component of V (r2) – blade velocity |
| B. | x- component of V (r2) + blade velocity |
| C. | Blade velocity – x- component of V (r2) |
| D. | Zero |
| Answer» C. Blade velocity – x- component of V (r2) | |
| 584. | In Pelton wheel, if outlet velocity angle of jet is “right angled” then outlet whirl velocity of jet is |
| A. | x- component of V (r2) – blade velocity |
| B. | x- component of V (r2) + blade velocity |
| C. | Blade velocity – x- component of V (r2) |
| D. | Zero |
| Answer» D. Zero | |
| 585. | In Pelton wheel, relative inlet velocity of jet with respect to velocity of vane is |
| A. | Difference between inlet jet velocity and blade velocity |
| B. | Sum of inlet jet velocity and blade velocity |
| C. | Inlet jet velocity |
| D. | Blade velocity |
| Answer» A. Difference between inlet jet velocity and blade velocity | |
| 586. | In Pelton wheel if angle of deflection is not mentioned then we assume it as_ |
| A. | 150 degrees |
| B. | 200 degrees |
| C. | 165 degrees |
| D. | 185 degrees |
| Answer» C. 165 degrees | |
| 587. | The work done per unit weight of water jet striking runner blades of Pelton turbine is given by expression |
| A. | [Vw1+Vw2] u/g |
| B. | Vw1*u/g |
| C. | [Vw1+Vw2]/g |
| D. | [Vw1+Vw2]u |
| Answer» A. [Vw1+Vw2] u/g | |
| 588. | In Pelton turbine the energy available at inlet of runner that is at outlet of nozzle is known as |
| A. | Shaft power |
| B. | Runner power |
| C. | Output power |
| D. | Water power |
| Answer» B. Runner power | |
| 589. | In Pelton turbines the expression for power delivered at inlet to runner is given by |
| A. | W*[Vw1+Vw2]u/g |
| B. | W*[Vw1-Vw2]u/g |
| C. | W*[Vw1+Vw2]u/g, W*[Vw1-Vw2]u/g |
| D. | [Vw1+Vw2]u/g |
| Answer» C. W*[Vw1+Vw2]u/g, W*[Vw1-Vw2]u/g | |
| 590. | Calculate work done by jet per second on the runner where, discharge=0.7cubic meters/s, inlet and outlet whirl velocities be 23.77 and 2.94? |
| A. | 200Kw |
| B. | 150Kw |
| C. | 187Kw |
| D. | 250Kw |
| Answer» C. 187Kw | |
| 591. | 10.The expression for water power in Pelton wheel is |
| A. | (P*g*Q*H) Kw |
| B. | (g*Q*H*a) Kw |
| C. | (g*Q) Kw |
| D. | (g*H) Kw |
| Answer» A. (P*g*Q*H) Kw | |
| 592. | The hydraulic efficiency of Pelton turbine will be maximum when blade velocity is equal to |
| A. | V/2 |
| B. | V/3 |
| C. | V/4 |
| D. | V/5 |
| Answer» A. V/2 | |
| 593. | In Pelton turbine is defined as ratio between power delivered to runner and power supplied at inlet of turbine |
| A. | Mechanical efficiency |
| B. | Volumetric efficiency |
| C. | Hydraulic efficiency |
| D. | Overall efficiency |
| Answer» C. Hydraulic efficiency | |
| 594. | In Pelton turbine product of mechanical efficiency and hydraulic efficiency is known as |
| A. | Mechanical efficiency |
| B. | Volumetric efficiency |
| C. | Hydraulic efficiency |
| D. | Overall efficiency |
| Answer» D. Overall efficiency | |
| 595. | In Pelton is ratio of volume of water actually striking the runner and volume of water supplied to turbine? |
| A. | Mechanical efficiency |
| B. | Volumetric efficiency |
| C. | Hydraulic efficiency |
| D. | Overall efficiency |
| Answer» B. Volumetric efficiency | |
| 596. | In Pelton turbine the ratio of volume available at shaft of turbine and power supplied at the inlet of the turbine is |
| A. | Mechanical efficiency |
| B. | Volumetric efficiency |
| C. | Hydraulic efficiency |
| D. | Overall efficiency |
| Answer» D. Overall efficiency | |
| 597. | The expression for maximum hydraulic efficiency of Pelto turbine is given by |
| A. | (1+cos k)/2 where k is outlet blade angle |
| B. | (2+cos k)/2 where k is outlet blade angle |
| C. | (3+cos k)/2 where k is outlet blade angle |
| D. | (4+cos k)/2 where k is outlet blade angle |
| Answer» A. (1+cos k)/2 where k is outlet blade angle | |
| 598. | In the expression for overall efficiency of turbine, which is p/ (k*g*q*h), where “k” is known as |
| A. | Specific density of liquid |
| B. | Density of liquid |
| C. | Specific gravity of liquid |
| D. | Volume of liquid |
| Answer» B. Density of liquid | |
| 599. | Design of Pelton wheel means the following data is to be determined. |
| A. | Width of buckets |
| B. | Depth of buckets |
| C. | Number of buckets |
| D. | All of the mentioned |
| Answer» D. All of the mentioned | |
| 600. | The width of buckets of Pelton wheel is |
| A. | 2 times diameter of jet |
| B. | 3 times diameter of jet |
| C. | 4 times diameter of jet |
| D. | 5 times diameter of jet |
| Answer» D. 5 times diameter of jet | |
| 601. | The depth of buckets of Pelton wheel |
| A. | 1.2 times diameter of jet |
| B. | 1.3 times diameter of jet |
| C. | 1.4 times diameter of jet |
| D. | 1.5 times diameter of jet |
| Answer» A. 1.2 times diameter of jet | |
| 602. | The ratio of pitch diameter of Pelton wheel to diameter of jet is known as |
| A. | Speed ratio |
| B. | Jet ratio |
| C. | Velocity ratio |
| D. | Co-efficient of velocity |
| Answer» B. Jet ratio | |
| 603. | Find the diameter of jet D, if jet ratio m and diameter of jet d are given as 10 and 125mm. |
| A. | 1.25 meters |
| B. | 1.5 meters |
| C. | 2 meters |
| D. | 1.2 meters |
| Answer» A. 1.25 meters | |
| 604. | The number of buckets of Pelton wheel is 25 and diameter of runner is 1.5meters then calculate diameter of jet is |
| A. | 80mm |
| B. | 85mm |
| C. | 90mm |
| D. | 82mm |
| Answer» B. 85mm | |
| 605. | In most of cases the value of jet ratio is |
| A. | 10 |
| B. | 11 |
| C. | 12 |
| D. | 13 |
| Answer» C. 12 | |
| 606. | Number of buckets on runner of Pelton wheel is given by expression? (D-diameter of runner and d- diameter of jet) |
| A. | 15 + D/2d |
| B. | 15 + 3D/2d |
| C. | 15 + D/d |
| D. | 15 + 2D/d |
| Answer» A. 15 + D/2d | |
| 607. | is obtained by dividing total rate of flow through the turbine by rate of flow through single jet. |
| A. | Number of jets |
| B. | Diameter of jets |
| C. | Velocity of jets |
| D. | Speed ratio |
| Answer» A. Number of jets | |
| 608. | If diameter of jet is 85mm and diameter of runner is 1.5 meter then calculate width of buckets. |
| A. | 400mm |
| B. | 500mm |
| C. | 420mm |
| D. | 425mm |
| Answer» D. 425mm | |
| 609. | If diameter of jet is 85mm and diameter of runner is 1.5 meter then depth of buckets is |
| A. | 100mm |
| B. | 105mm |
| C. | 106mm |
| D. | 102mm |
| Answer» D. 102mm | |
| 610. | If diameter of jet is 85mm and diameter of runner is 1.5 meter then calculate number of buckets on Pelton wheel approximately |
| A. | 20 |
| B. | 22 |
| C. | 23 |
| D. | 25 |
| Answer» D. 25 | |
| 611. | Radial flow reaction turbines are those turbines in which water flows |
| A. | Radial direction |
| B. | Axial direction |
| C. | Tangential direction |
| D. | All of the mentioned |
| Answer» A. Radial direction | |
| 612. | Main parts of radial flow reaction turbines are |
| A. | Casing |
| B. | Guide mechanism |
| C. | Draft tube |
| D. | All of the mentioned |
| Answer» D. All of the mentioned | |
| 613. | Radial flow reaction turbines contain spiral casing which area |
| A. | Remains constant |
| B. | Gradually decreases |
| C. | Gradually increases |
| D. | Suddenly decreases |
| Answer» B. Gradually decreases | |
| 614. | consists of stationary circular wheel all around the runner of turbine |
| A. | Casing |
| B. | Guide mechanism |
| C. | Runner |
| D. | Drafting |
| Answer» B. Guide mechanism | |
| 615. | The casing of radial flow reaction turbine is made of spiral shape, so that water may enter the runner |
| A. | Variable acceleration |
| B. | Constant acceleration |
| C. | Variable velocity |
| D. | Constant velocity |
| Answer» D. Constant velocity | |
| 616. | allow the water to strike the vanes fixed on runner without shock at inlet |
| A. | Casing |
| B. | Guide vanes |
| C. | Runner |
| D. | Draft tube |
| Answer» B. Guide vanes | |
| 617. | Runner blades are made up of |
| A. | Cast steel |
| B. | Cast iron |
| C. | Wrought iron |
| D. | Steel |
| Answer» A. Cast steel | |
| 618. | The pressure at the exit of runner of reaction turbine is generally than atmospheric pressure |
| A. | Greater |
| B. | Lesser |
| C. | Constant |
| D. | Equal |
| Answer» B. Lesser | |
| 619. | is a pipe of gradually increasing area used for discharging water from exit of the turbine to the tail race |
| A. | Casing |
| B. | Guide mechanism |
| C. | Draft tube |
| D. | Runner |
| Answer» C. Draft tube | |
| 620. | and of radial flow reaction turbine are always full of water. |
| A. | Casing and runner |
| B. | Casing and penstocks |
| C. | Runner and penstocks |
| D. | Runner and draft tube |
| Answer» A. Casing and runner | |
| 621. | governs the flow of water entering the runner blades. |
| A. | Casing |
| B. | Guide vanes |
| C. | Draft tube |
| D. | Runner |
| Answer» B. Guide vanes | |
| 622. | Inward radial flow reaction turbine is a turbine in which water flows across the blades of runner_ |
| A. | Radial direction |
| B. | Radially inward |
| C. | Radially outward |
| D. | Axial direction |
| Answer» B. Radially inward | |
| 623. | Which of following is inward radial flow reaction turbine? |
| A. | Pelton wheel |
| B. | Francis turbine |
| C. | Axial turbine |
| D. | Kaplan turbine |
| Answer» B. Francis turbine | |
| 624. | In Inward radial flow reaction turbine which is not required? |
| A. | Runner |
| B. | Air tight casing |
| C. | Guide vanes |
| D. | Breaking jet |
| Answer» D. Breaking jet | |
| 625. | The main difference between reaction turbine and inward radial flow reaction turbine is water flows |
| A. | Radial direction |
| B. | Radially inward |
| C. | Radially outward |
| D. | Axial direction |
| Answer» B. Radially inward | |
| 626. | In Inward radial flow reaction turbine the ratio of tangential wheel at inlet to given velocity of jet is known as |
| A. | Speed ratio |
| B. | Flow ratio |
| C. | Discharge |
| D. | Radial discharge |
| Answer» B. Flow ratio | |
| 627. | In Inward radial flow reaction turbine the ratio of tangential velocity at inlet to the given velocity |
| A. | Speed ratio |
| B. | Flow ratio |
| C. | Discharge |
| D. | Radial discharge |
| Answer» A. Speed ratio | |
| 628. | In Inward radial flow reaction turbine if angle made by absolute velocity with its tangent is 90 degrees and component of whirl is zero at outlet is |
| A. | Radial inlet discharge |
| B. | Radial outlet discharge |
| C. | Flow ratio |
| D. | Speed ratio |
| Answer» B. Radial outlet discharge | |
| 629. | In which of following turbine whirl component is zero? |
| A. | Reaction turbine |
| B. | Inward radial flow reaction turbine |
| C. | Axial flow turbine |
| D. | Impulse turbine |
| Answer» B. Inward radial flow reaction turbine | |
| 630. | Discharge in inward flow reaction turbine |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Gradually decreases |
| Answer» B. Decreases | |
| 631. | Speed control of Outward flow reaction turbine is |
| A. | Easy |
| B. | Moderate |
| C. | Difficult |
| D. | Very difficult |
| Answer» B. Moderate | |
| 632. | Centrifugal head in inward flow reaction turbine |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Gradually decreases |
| Answer» B. Decreases | |
| 633. | Tendency of wheel to race is almost nil in turbine |
| A. | Inward flow reaction turbine |
| B. | Outward flow reaction turbine |
| C. | Impulse turbine |
| D. | Axial flow turbine |
| Answer» A. Inward flow reaction turbine | |
| 634. | The formation of vapour cavities is called |
| A. | Static pressure drop |
| B. | Cavitation |
| C. | Isentropic expansion |
| D. | Emulsion |
| Answer» B. Cavitation | |
| 635. | What is the degree of reaction denoted as? |
| A. | D |
| B. | R |
| C. | r |
| D. | d |
| Answer» B. R | |
| 636. | Voids are created due to |
| A. | Reaction ratio |
| B. | Pressure ratio |
| C. | Liquid free layers |
| D. | Volumetric layers |
| Answer» C. Liquid free layers | |
| 637. | Cavitation usually occurs due to the changes in |
| A. | Pressure |
| B. | Temperature |
| C. | Volume |
| D. | Heat |
| Answer» A. Pressure | |
| 638. | Degree of reactions are most commonly used in |
| A. | Turbomachinery |
| B. | Pressure drag |
| C. | Aerodynamics |
| D. | Automobiles |
| Answer» A. Turbomachinery | |
| 639. | At high pressure, the voids can generate |
| A. | Drag force |
| B. | Mass density |
| C. | Shock waves |
| D. | Flow speed |
| Answer» C. Shock waves | |
| 640. | Voids that implode near metal surface develops a |
| A. | Drag force |
| B. | Cyclic stress |
| C. | Shock waves |
| D. | Flow speed |
| Answer» B. Cyclic stress | |
| 641. | In case of gas turbines and compressors, degree of reaction is |
| A. | Static pressure drop in rotor/ static pressure drop in stage |
| B. | Static pressure drop in stage/ static pressure drop in rotor |
| C. | Isentropic enthalpy drop in rotor/ isentropic enthalpy drop in stage |
| D. | Static temperature drop in stage/ static temperature drop in rotor |
| Answer» C. Isentropic enthalpy drop in rotor/ isentropic enthalpy drop in stage | |
| 642. | The velocities of the blade angles can be found out using |
| A. | Mach number |
| B. | Froude’s number |
| C. | Velocity triangles |
| D. | Reynolds number |
| Answer» C. Velocity triangles | |
| 643. | Which among the following velocities cannot be found using the velocity triangle? |
| A. | Tangential |
| B. | Whirl |
| C. | Relative |
| D. | Parabolic |
| Answer» D. Parabolic | |
| 644. | Hydrodynamic cavitation is due to the process of |
| A. | Vaporisation |
| B. | Sedimentation |
| C. | Filtration |
| D. | Excavation |
| Answer» A. Vaporisation | |
| 645. | The process of bubble generation leads to |
| A. | High temperatures |
| B. | High pressures |
| C. | High energy densities |
| D. | High volumetric ratio |
| Answer» C. High energy densities | |
| 646. | Degree of reaction turbine is the ratio of? |
| A. | Pressure energy to total energy |
| B. | Kinetic energy to total energy |
| C. | Potential energy to total energy |
| D. | Kinetic energy to potential energy |
| Answer» A. Pressure energy to total energy | |
| 647. | Which of these options are best suited for the total energy change inside the runner per unit weight? |
| A. | Degree of action |
| B. | Degree of reaction |
| C. | Turbulence |
| D. | Efficiency of turbine |
| Answer» B. Degree of reaction | |
| 648. | Which of these ratios are termed to be hydraulic efficiency? |
| A. | Water power to delivered power |
| B. | Delivered power to input power |
| C. | Power lost to power delivered |
| D. | Runner power to water power |
| Answer» D. Runner power to water power | |
| 649. | When a container containing a liquid is rotated, then due to centrifugal action, then which of these energies are changed? |
| A. | Kinetic energy |
| B. | Pressure energy |
| C. | Potential energy |
| D. | Energy due to viscous force |
| Answer» B. Pressure energy | |
| 650. | For an actual reaction turbine, what should be the angle beta, such that the loss of kinetic energy at the outlet is to be minimum? |
| A. | 90 |
| B. | 45 |
| C. | 60 |
| D. | 30 |
| Answer» A. 90 | |
| 651. | Discharge through a reaction flow reaction turbine is given by, Q = |
| A. | Pi*d*b*Vf1 |
| B. | Pi*d*d*b*Vf1 |
| C. | Pi*d*b*b*Vf2 |
| D. | Pi*b*b*Vf1 |
| Answer» A. Pi*d*b*Vf1 | |
| 652. | When the thicknesses of vanes are to be considered in the discharge of a turbine, what will be the area under consideration? |
| A. | Pi*d – n*t |
| B. | Pi*d – n*n*t |
| C. | Pi*d – t*t |
| D. | Pi*d *d– n*t |
| Answer» A. Pi*d – n*t | |
| 653. | means the angle made by absolute velocity with the tangent on the wheel is 90 degrees and the component of whirl velocity is zero. |
| A. | Axial discharge |
| B. | Tangential discharge |
| C. | Turbulent discharge |
| D. | Radial discharge |
| Answer» D. Radial discharge | |
| 654. | In a Francis turbine, degree of reaction lies between |
| A. | 0 and 1 |
| B. | 1 and 2 |
| C. | 0 and 0.5 |
| D. | 0.5 and 0.1 |
| Answer» A. 0 and 1 | |
| 655. | The water from penstocks enters the which is spiral in shape which the area of cross section of casing goes on decreasing gradually |
| A. | guide wheel |
| B. | draft tube |
| C. | casing |
| D. | runner |
| Answer» C. casing | |
| 656. | If the water flows from inwards to outwards, the turbine is known as |
| A. | Tangential flow turbine |
| B. | Turbulent low inward flow |
| C. | Inward flow turbine |
| D. | Outward flow turbine |
| Answer» D. Outward flow turbine | |
| 657. | In general, reaction turbines consist of which types of energies? |
| A. | kinetic energy and potential energy |
| B. | potential energy and pressure energy |
| C. | kinetic energy and pressure energy |
| D. | gravitational energy and potential energy |
| Answer» C. kinetic energy and pressure energy | |
| 658. | is a circular wheel on which a series of smooth, radial curved vanes are fixed. |
| A. | Guide wheel |
| B. | Runner |
| C. | Casing |
| D. | Draft tube |
| Answer» B. Runner | |
| 659. | In an outward radial flow reaction turbine the ratio of tangential wheel at inlet to given velocity of jet is known as |
| A. | Speed ratio |
| B. | Flow ratio |
| C. | Discharge |
| D. | Radial discharge |
| Answer» B. Flow ratio | |
| 660. | In an outward radial flow reaction turbine the ratio of tangential velocity at inlet to the given velocity is |
| A. | Speed ratio |
| B. | Flow ratio |
| C. | Discharge |
| D. | Radial discharge |
| Answer» A. Speed ratio | |
| 661. | Discharge in an outward flow reaction turbine |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Gradually decreases |
| Answer» A. Increases | |
| 662. | An outward radial reaction turbine has |
| A. | u1 < u2 |
| B. | u1 > u2 |
| C. | u1 = u2 |
| D. | u2 = u1 = 0 |
| Answer» A. u1 < u2 | |
| 663. | An outward flow reaction turbine, |
| A. | D1 > D2 |
| B. | D1 < D2 |
| C. | D1 = D2 |
| D. | D1 = D2 = 0 |
| Answer» B. D1 < D2 | |
| 664. | is ratio of pressure energy change inside runner to total energy change inside runner |
| A. | Degree of reaction |
| B. | Speed ratio |
| C. | Flow ratio |
| D. | Hydraulic efficiency |
| Answer» A. Degree of reaction | |
| 665. | Degree of reaction for impulse turbine |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» A. 0 | |
| 666. | Degree of reaction for reaction turbine is |
| A. | 1- cot x /2(cot x –cot y ) |
| B. | 1+ cot x /2(cot x –cot y ) |
| C. | 1- cot x /2(cot x +cot y ) |
| D. | 1+ cot x /2(cot x +cot y ) |
| Answer» A. 1- cot x /2(cot x –cot y ) | |
| 667. | A turbine is a |
| A. | Rotary mechanical device |
| B. | Static pressure drop device |
| C. | Electrical device |
| D. | Static temperature device |
| Answer» A. Rotary mechanical device | |
| 668. | Turbine converts |
| A. | Work to energy |
| B. | Energy to work |
| C. | Work to Electricity |
| D. | Work to pressure |
| Answer» B. Energy to work | |
| 669. | Turbine extracts energy from |
| A. | Reaction ratio |
| B. | Pressure ratio |
| C. | Fluid flow |
| D. | Volumetric ratio |
| Answer» C. Fluid flow | |
| 670. | Inward flow reaction turbine enter through |
| A. | Outer periphery |
| B. | Blades |
| C. | Inner periphery |
| D. | Pressure angle |
| Answer» A. Outer periphery | |
| 671. | A turbine is a |
| A. | Turbomachinery |
| B. | Pressure drag |
| C. | Aerodynamics |
| D. | Automobiles |
| Answer» A. Turbomachinery | |
| 672. | Centrifugal flow is imparted when the_ |
| A. | Reaction flow is negative |
| B. | Reaction flow is positive |
| C. | Efficiency is 100 percent |
| D. | Reaction rate is negligible |
| Answer» C. Efficiency is 100 percent | |
| 673. | Where is the turbine not used? |
| A. | Solar power |
| B. | Windmill |
| C. | Water wheels |
| D. | Gas plant |
| Answer» A. Solar power | |
| 674. | In an inward flow reaction turbine the discharge |
| A. | Increases |
| B. | Decreases |
| C. | Same |
| D. | Independent |
| Answer» B. Decreases | |
| 675. | In impulse turbines with moving blades, there is no in blades of the turbine. |
| A. | Pressure change |
| B. | Same pressure |
| C. | Volumetric change |
| D. | Pressure independent |
| Answer» A. Pressure change | |
| 676. | In impulse turbines with stationary blades, there is in blades of the turbine. |
| A. | Pressure change |
| B. | Same pressure |
| C. | Volumetric change |
| D. | Pressure independent |
| Answer» A. Pressure change | |
| 677. | In an outward flow reaction turbine the discharge |
| A. | Increases |
| B. | Decreases |
| C. | Same |
| D. | Independent |
| Answer» A. Increases | |
| 678. | Before reaching the turbine, the acceleration of the fluid takes place through the |
| A. | Vane angle |
| B. | Nozzle |
| C. | Pump |
| D. | Pipe |
| Answer» B. Nozzle | |
| 679. | The Pelton wheel extracts energy from |
| A. | Vane angle |
| B. | Moving fluid |
| C. | Increase in temperature |
| D. | Heat rejection |
| Answer» B. Moving fluid | |
| 680. | The outward radial flow reaction turbine is a turbine in which direction of water flow is |
| A. | Radial direction |
| B. | Radially inward |
| C. | Radially outward |
| D. | Axial direction |
| Answer» C. Radially outward | |
| 681. | The energy available at inlet for outward reaction flow turbine is |
| A. | Potential |
| B. | Kinetic energy |
| C. | Pressure energy |
| D. | Pressure energy and Kinetic energy |
| Answer» D. Pressure energy and Kinetic energy | |
| 682. | Centrifugal head in Outward flow reaction turbine |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Gradually decreases |
| Answer» A. Increases | |
| 683. | Discharge in outward flow reaction turbine |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Gradually decreases |
| Answer» A. Increases | |
| 684. | Speed control of Outward flow reaction turbine is |
| A. | Easy |
| B. | Moderate |
| C. | Difficult |
| D. | Very difficult |
| Answer» D. Very difficult | |
| 685. | Tendency of wheel to race is predominant in turbine |
| A. | Inward flow reaction turbine |
| B. | Outward flow reaction turbine |
| C. | Impulse turbine |
| D. | Axial flow turbine |
| Answer» B. Outward flow reaction turbine | |
| 686. | Outward flow reaction turbine will quite suitable for_ |
| A. | High head |
| B. | Medium head |
| C. | Low head |
| D. | Static head |
| Answer» B. Medium head | |
| 687. | In outward flow reaction turbine tangential velocity at inlet is always_ than outlet velocity. |
| A. | Equal |
| B. | Less |
| C. | More |
| D. | Constant |
| Answer» B. Less | |
| 688. | In outward radial flow reaction turbine if angle made by absolute velocity with its tangent is 90 degrees and component of whirl is zero at inlet is |
| A. | Radial inlet discharge |
| B. | Radial outlet discharge |
| C. | Flow ratio |
| D. | Speed ratio |
| Answer» A. Radial inlet discharge | |
| 689. | The main difference between reaction turbine and outward radial flow reaction turbine is water flows |
| A. | Radial direction |
| B. | Radially inward |
| C. | Radially outward |
| D. | Axial direction |
| Answer» B. Radially inward | |
| 690. | In outward radial flow reaction turbine the ratio of tangential wheel at inlet to given velocity of jet is known as |
| A. | Speed ratio |
| B. | Flow ratio |
| C. | Discharge |
| D. | Radial discharge |
| Answer» B. Flow ratio | |
| 691. | Conical diffuser draft tube is also called |
| A. | Straight divergent tube |
| B. | Simple elbow tube |
| C. | Thermal tube |
| D. | Elbow tube with varying cross section |
| Answer» A. Straight divergent tube | |
| 692. | The simple elbow draft tube is placed close to the_ |
| A. | Head race |
| B. | Tail race |
| C. | Tank |
| D. | Nozzle |
| Answer» B. Tail race | |
| 693. | Turbine that consists of moving nozzles and with fixed nozzles is called as |
| A. | Impulse turbine |
| B. | Curtis turbine |
| C. | Rateau turbine |
| D. | Reaction turbine |
| Answer» D. Reaction turbine | |
| 694. | An example of reaction turbine is_ |
| A. | Parsons turbine |
| B. | Curtis turbine |
| C. | Rateau turbine |
| D. | Pelton wheel |
| Answer» A. Parsons turbine | |
| 695. | When we arrange turbine blades in multiple stages it is called |
| A. | Pressure change |
| B. | Vane deviation |
| C. | Compounding |
| D. | Pressure ratio |
| Answer» C. Compounding | |
| 696. | Compounding is needed to |
| A. | Increase Pressure |
| B. | Decrease temperature |
| C. | Change volume |
| D. | Increase efficiency |
| Answer» D. Increase efficiency | |
| 697. | Which among the following is not a type of compounding? |
| A. | Pressure |
| B. | Temperature |
| C. | Pressure velocity |
| D. | Velocity |
| Answer» B. Temperature | |
| 698. | Newtons second law describes the transfer of energy through impulse turbines. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 699. | Inner radial flow extracts energy from |
| A. | Turbine blades |
| B. | Moving fluid |
| C. | Pressure change |
| D. | Temperature increase |
| Answer» B. Moving fluid | |
| 700. | Reaction turbines develop torque by reacting to the gas or fluids pressure or mass. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 701. | What is the water flow direction in the runner in a Francis turbine? |
| A. | Axial and then tangential |
| B. | Tangential and then axial |
| C. | Radial and then axial |
| D. | Axial and then radial |
| Answer» C. Radial and then axial | |
| 702. | Which of the following is true in case of flow of water before it enters the runner of a Francis Turbine? |
| A. | Available head is entirely converted to velocity head |
| B. | Available head is entire converted to pressure head |
| C. | Available head is neither converted to pressure head nor velocity head |
| D. | Available head is partly converted to pressure head and partly to velocity head |
| Answer» D. Available head is partly converted to pressure head and partly to velocity head | |
| 703. | Why does the cross sectional area of the Spiral casing gradually decrease along the circumference of the Francis turbine from the entrance to the tip? |
| A. | To ensure constant velocity of water during runner entry |
| B. | To prevent loss of efficiency of the turbine due to impulsive forces caused by extra area |
| C. | To prevent leakage from the turbine |
| D. | To reduce material costs in order to make the turbine more economical |
| Answer» A. To ensure constant velocity of water during runner entry | |
| 704. | Which of the following profiles are used for guide vanes to ensure smooth flow without separation? |
| A. | Rectangular |
| B. | Bent Rectangular |
| C. | Elliptical |
| D. | Aerofoil |
| Answer» D. Aerofoil | |
| 705. | In which of the following type of runners the velocity of whirl at inlet is greater than the blade velocity? |
| A. | Such a case is practically impossible |
| B. | Slow Runner |
| C. | Medium Runner |
| D. | Fast Runner |
| Answer» B. Slow Runner | |
| 706. | Which of the following runner types will have the highest vane angle at inlet (β1 value)? |
| A. | Slow Runner |
| B. | Medium Runner |
| C. | Fast Runner |
| D. | Vane angle is defined only for Kaplan Turbines and not Francis turbines |
| Answer» C. Fast Runner | |
| 707. | In case of a Medium runner, tan (α1) CANNOT be given by (α1 = Guide vane angle at inlet)? |
| A. | Vf1 / Vw1 |
| B. | Vr1 / Vw1 |
| C. | Vr1 / u1 |
| D. | Vw1 / u1 |
| Answer» D. Vw1 / u1 | |
| 708. | In the velocity diagrams for Francis turbine, which of the following velocity directions is along the blade curvature? |
| A. | Vr1 |
| B. | Vw1 |
| C. | V1 |
| D. | u1 |
| Answer» A. Vr1 | |
| 709. | In the figure shown below,which of the following angles replace the question mark? |
| A. | Guide vane angle at inlet |
| B. | Blade angle at inlet |
| C. | Vane angle at inlet |
| D. | Blade angle at outlet |
| Answer» A. Guide vane angle at inlet | |
| 710. | In the figure shown below, which of the following type of runners has the blade curvature as shown in the above figure (The arrow denotes direction of blade motion)? |
| A. | Information insufficient to determine |
| B. | Slow Runner |
| C. | Medium Runner |
| D. | Fast Runner |
| Answer» B. Slow Runner | |
| 711. | Francis turbine is typically used for which of the following values of available heads? |
| A. | 300 m |
| B. | 100 m |
| C. | 30 m |
| D. | 5 m |
| Answer» B. 100 m | |
| 712. | Water flow velocity is given 10 m/s. The runner diameter is 3 m and the width of the wheel is 25 cm. Find the mass of water (kg) flowing across the runner per second. |
| A. | 7500π |
| B. | 50π |
| C. | 300π |
| D. | RPM of the turbine needs to be given |
| Answer» A. 7500π | |
| 713. | Work done per second by a Francis turbine can be given by ρAVf (Vw1u1 + Vw2u2). |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» B. False | |
| 714. | Which of the following terms is considered to be zero while deriving the equation for work done per second for Francis Turbine? |
| A. | Vr1 |
| B. | Vw2 |
| C. | Vf2 |
| D. | Vr2 |
| Answer» B. Vw2 | |
| 715. | Power developed by Francis turbine are calculated for a certain set of conditions. Now, the inlet whirl velocity is doubled, the blade velocity at inlet is doubled and the flow velocity is quartered. The power developed: |
| A. | Is 4 times the original value |
| B. | Is 2 times the original value |
| C. | Is ½ times the original value |
| D. | Is same as the original value |
| Answer» D. Is same as the original value | |
| 716. | Volume flow rate of water in a Francis turbine runner is 25 m3/s. The flow velocity, whirl velocity and blade velocity are 11 m/s, 10 m/s and 5 m/s respectively, all values given at runner inlet. Find the power developed by the turbine. |
| A. | 25 kW |
| B. | 1.25 MW |
| C. | 1.25 kW |
| D. | 25 MW |
| Answer» B. 1.25 MW | |
| 717. | The flow rate of the water flow in a Francis turbine is increased by 50% keeping all the other parameters same. The work done by the turbine changes by? |
| A. | 50% increase |
| B. | 25% increase |
| C. | 100% increase |
| D. | 150% increase |
| Answer» A. 50% increase | |
| 718. | A student performs an experiment with a Francis turbine. He accidently set the RPM of Francis turbine to 1400 rpm instead of 700 rpm. He reported the power to be 1 MW. His teacher asks him to perform the same experiment using the correct RPM. The student performs the same experiment again, but this time the erroneously doubled the flow velocity. What does the student report the power to be? |
| A. | 0.5 MW |
| B. | 0.25 MW |
| C. | 2 MW |
| D. | 1 MW |
| Answer» D. 1 MW | |
| 719. | The available head of a Francis Turbine is 100 m. Velocity of the flow at the runner inlet is 15 m/s. Find the flow ratio. |
| A. | 0.33 |
| B. | 0.45 |
| C. | 0.67 |
| D. | 0.89 |
| Answer» A. 0.33 | |
| 720. | How does the flow ratio (ψ) of a Francis turbine vary with available head (H)? |
| A. | ψ α H |
| B. | ψ α 1/H |
| C. | ψ α sqrt (H) |
| D. | ψ α 1/(sqrt (H)) |
| Answer» D. ψ α 1/(sqrt (H)) | |
| 721. | What is the typical value for flow ratio in a Francis turbine? |
| A. | 0.05 – 0.1 |
| B. | 0.15 – 0.30 |
| C. | 0.35 – 0.45 |
| D. | 0.50 – 0.60 |
| Answer» B. 0.15 – 0.30 | |
| 722. | The available head of a Francis Turbine is 120 m. The blade velocity is given 35 m/s. Find the speed ratio of the turbine. |
| A. | 0.56 |
| B. | 0.61 |
| C. | 0.71 |
| D. | 0.81 |
| Answer» C. 0.71 | |
| 723. | The speed ratio (φ) varies directly with which of the following parameters? |
| A. | Vw1 |
| B. | V1 |
| C. | N (RPM) |
| D. | H (Available head) |
| Answer» C. N (RPM) | |
| 724. | The typical value range of speed ratio for a Francis turbine is: |
| A. | 0.3 – 0.6 |
| B. | 0.5 – 0.6 |
| C. | 0.1 – 0.4 |
| D. | 0.6 – 0.9 |
| Answer» D. 0.6 – 0.9 | |
| 725. | Which of the following efficiencies for Francis Turbine is described as the ratio between the power produced by runner to the power supplied by water at the inlet? |
| A. | Hydraulic efficiency |
| B. | Volumetric efficiency |
| C. | Mechanical efficiency |
| D. | Overall efficiency |
| Answer» A. Hydraulic efficiency | |
| 726. | Which of the following efficiencies for Francis Turbine is described as the ratio between total quantity of water over runner blades to total quantity of water supplied to turbine? |
| A. | Hydraulic efficiency |
| B. | Volumetric efficiency |
| C. | Mechanical efficiency |
| D. | Overall efficiency |
| Answer» B. Volumetric efficiency | |
| 727. | Which of the following efficiencies for Francis Turbine is defined as the ratio between the power available at the shaft of the turbine to the power produced by the runner? |
| A. | Hydraulic efficiency |
| B. | Volumetric efficiency |
| C. | Mechanical efficiency |
| D. | Overall efficiency |
| Answer» C. Mechanical efficiency | |
| 728. | Which of the following efficiencies for Francis Turbine is defined as the ratio between the power available at the shaft to the power supplied by water at the inlet? |
| A. | Hydraulic efficiency |
| B. | Volumetric efficiency |
| C. | Mechanical efficiency |
| D. | Overall efficiency |
| Answer» D. Overall efficiency | |
| 729. | The whirl velocity at inlet of Francis turbine is given to be 20 m/s. The blade velocity is given as 35 m/s. What is the hydraulic efficiency for a head of 100 m? |
| A. | 80% |
| B. | 90% |
| C. | 70% |
| D. | 98% |
| Answer» C. 70% | |
| 730. | The desired hydraulic efficiency of a turbine is 80% at a whirl velocity of 20 m/s and a head of 100 m. What should be the blade velocity of the turbine at inlet in m/s? |
| A. | 40 |
| B. | 60 |
| C. | 80 |
| D. | 25 |
| Answer» A. 40 | |
| 731. | The input water power of the Francis turbine is 1.25 times the runner power. What would be the hydraulic efficiency of the turbine (in %)? |
| A. | 60 |
| B. | 70 |
| C. | 80 |
| D. | 90 |
| Answer» C. 80 | |
| 732. | The volume flow rate into a Francis turbine is Q m3/s. 0.25Q m3/s volume of water do not flow over the runner blades. What is the mechanical efficiency of the turbine (in %)? |
| A. | 65 |
| B. | 75 |
| C. | 80 |
| D. | Mechanical efficiency cannot be found out from the given information |
| Answer» D. Mechanical efficiency cannot be found out from the given information | |
| 733. | The volumetric efficiency of a Francis turbine is given to be 90%. If the volume flow rate through the turbine is 25 m3/s. What is the flow rate of water over the runner blades (in m3/s)? |
| A. | 20 |
| B. | 25 |
| C. | 22.5 |
| D. | 21.5 |
| Answer» C. 22.5 | |
| 734. | The volumetric efficiency of a given turbine is 80%. If volume flow rate of water in given to be 30 m3/s, find the volume of water (m3) NOT flowing over the runner blades per second? |
| A. | 5 |
| B. | 6 |
| C. | 10 |
| D. | 12 |
| Answer» B. 6 | |
| 735. | The power available at the shaft of a Francis turbine is 1 MW. The volume flow rate of water in 25 m3/s, whirl velocity at inlet is 10 m/s and blade velocity is 5 m/s. Find the mechanical efficiency (in %)? |
| A. | 65 |
| B. | 75 |
| C. | 80 |
| D. | 90 |
| Answer» C. 80 | |
| 736. | The whirl velocity at inlet is 15 m/s and blade velocity is 10 m/s. The volume flow rate of water in 20 m3/s. Find the power output available at the shaft if the mechanical efficiency is 95% (in MW)? |
| A. | 2.85 |
| B. | 3.075 |
| C. | 6.55 |
| D. | 0.285 |
| Answer» A. 2.85 | |
| 737. | The power output of the shaft is 5 MW. The volume flow rate of water in 10 m3/s at an available head of 60 m. Find the overall efficiency of the turbine in % (g = 10 m/s2)? |
| A. | 80 |
| B. | 82.5 |
| C. | 83.3 |
| D. | 85 |
| Answer» C. 83.3 | |
| 738. | The volume flow rate of water in 10 m3/s at an available head of 60 m (g = 10 m/s3). Find the shaft power (in MW) if the overall efficiency of the turbine is 90%. |
| A. | 54 |
| B. | 5.4 |
| C. | 540 |
| D. | 0.54 |
| Answer» B. 5.4 | |
| 739. | The hydraulic efficiency of a Francis turbine is 90%, the mechanical efficiency is 95% and the volumetric efficiency is assumed to be 100%. Fine the overall efficiency (in %)? |
| A. | 80 |
| B. | 85.5 |
| C. | 87.5 |
| D. | 83.3 |
| Answer» B. 85.5 | |
| 740. | In a Kaplan turbine, what is the direction of water flow? |
| A. | Axial and then axial |
| B. | Radial and then axial |
| C. | Tangential and then axial |
| D. | Tangential and then radial |
| Answer» A. Axial and then axial | |
| 741. | For which of the following values of available heads may Kaplan turbine be used? |
| A. | 250 m |
| B. | 100 m |
| C. | 80 m |
| D. | 50 m |
| Answer» D. 50 m | |
| 742. | In this type of low head turbine, the guide vanes are fixed to the hub of the turbine and are not adjustable. What is this type of turbine called? |
| A. | Francis turbine |
| B. | Kaplan Turbine |
| C. | Propeller Turbine |
| D. | Pelton turbine |
| Answer» A. Francis turbine | |
| 743. | The velocity of flow through a Kaplan turbine is 10 m/s. The outer diameter of the runner is 4 m and the hub diameter is 2 m. Find the volume flow rate of the turbine in m3/s? |
| A. | 95 |
| B. | 75 |
| C. | 85 |
| D. | 105 |
| Answer» A. 95 | |
| 744. | The velocity of the flow at the inlet of Kaplan turbine is V. In an experimental setup, what could be the possible value of the velocity of the flow at the outlet of Kaplan turbine? |
| A. | V |
| B. | 0.8V |
| C. | 1.2V |
| D. | 2V |
| Answer» B. 0.8V | |
| 745. | Which of the following turbines will have the lowest number of blades in it? |
| A. | Pelton turbine |
| B. | Steam turbine |
| C. | Francis turbine |
| D. | Kaplan turbine |
| Answer» D. Kaplan turbine | |
| 746. | The velocity of the flow through the Kaplan turbine is 25 m/s. The available head of the turbine is 60 m. Find the flow ratio of the turbine (take g = 10 m/s2). |
| A. | 0.65 |
| B. | 0.72 |
| C. | 0.69 |
| D. | 0.75 |
| Answer» B. 0.72 | |
| 747. | A Kaplan turbine requires a speed ratio of 2. The available head of the turbine is 5 m. What should be the blade velocity of the turbine such that a speed ratio of 2 is maintained (take g = 10 m/s2)? |
| A. | 75.75 m/s |
| B. | 63.25 m/s |
| C. | 23.35 m/s |
| D. | 50.00 m/s |
| Answer» B. 63.25 m/s | |
| 748. | The flow ratio of a Kaplan turbine is given as 0.7. The available head is 30 m. The outer diameter of the runner is 3.5 m and the hub diameter is 2 m. Find the volume of water flowing through the turbine per second (m3/s)? |
| A. | 90 |
| B. | 111 |
| C. | 125 |
| D. | 168 |
| Answer» B. 111 | |
| 749. | In which of the following type of runners in a Kaplan turbine the velocity of whirl at inlet is smaller than the blade velocity? |
| A. | Such a case is practically impossible |
| B. | Slow Runner |
| C. | Medium Runner |
| D. | Fast Runner |
| Answer» D. Fast Runner | |
| 750. | In the outlet velocity triangle of a Kaplan turbine, β2 = 30o. Vf2 = 5 m/s. What is the relative velocity of the flow at outlet? |
| A. | 10 m/s |
| B. | 5.77 m/s |
| C. | 8.66 m/s |
| D. | 2.88 m/s |
| Answer» A. 10 m/s | |
| 751. | In the inlet velocity triangle of a Kaplan turbine, α1 = 45o. The velocity of flow at inlet = 10 m/s. Find the whirl velocity of water at the inlet of Kaplan turbine? |
| A. | 5 m/s |
| B. | 10 m/s |
| C. | 12.5 m/s |
| D. | 15 m/s |
| Answer» B. 10 m/s | |
| 752. | The whirl velocity of water at the inlet of the Kaplan turbine is 15 m/s. The velocity of water at inlet of the turbine is 20 m/s. Find the guide vane angle at inlet (In degrees). |
| A. | 53.13 |
| B. | 36.86 |
| C. | 45 |
| D. | 41.41 |
| Answer» D. 41.41 | |
| 753. | The relative velocity of water at the inlet of the Kaplan turbine is 7 m/s. β1 = 75o. The whirl velocity of the water at inlet is 10 m/s. Find the blade velocity of the turbine? |
| A. | 26.124 m/s |
| B. | 40 m/s |
| C. | 36.124 m/s |
| D. | 60 m/s |
| Answer» C. 36.124 m/s | |
| 754. | For the figure given below, find the missing terms in the order of (1), (2), (3) and (4). |
| A. | Vr1, α1, β1, Vw1 |
| B. | Vw1, β1, α1, Vr1 |
| C. | Vw1, α1, β1, Vr1 |
| D. | Vr1, β1, α1, Vw1 |
| Answer» C. Vw1, α1, β1, Vr1 | |
| 755. | Kaplan turbine works on |
| A. | Electrical energy |
| B. | Hydro energy |
| C. | Thermal energy |
| D. | Chemical energy |
| Answer» C. Thermal energy | |
| 756. | Kaplan turbine is an reaction turbine |
| A. | Inward flow |
| B. | Outward flow |
| C. | Radial |
| D. | Axial |
| Answer» A. Inward flow | |
| 757. | The Kaplan Turbine is an evolution of |
| A. | Francis turbine |
| B. | Pelton wheel |
| C. | Parsons turbine |
| D. | Curtis turbine |
| Answer» A. Francis turbine | |
| 758. | What is the dimension of thermal efficiency of a Kaplan turbine? |
| A. | kg |
| B. | m |
| C. | kg/m |
| D. | Dimensionless |
| Answer» D. Dimensionless | |
| 759. | A Kaplan turbine is used in |
| A. | Turbomachinery |
| B. | Pressure drag |
| C. | Aerodynamics |
| D. | Automobiles |
| Answer» A. Turbomachinery | |
| 760. | The head of the Kaplan ranges from |
| A. | 100 to 200 m |
| B. | 250 to 300 m |
| C. | 10 to 70 m |
| D. | 0 m |
| Answer» C. 10 to 70 m | |
| 761. | Nozzles in the Kaplan turbine move due to impact of |
| A. | Water |
| B. | Steam |
| C. | Blade |
| D. | Another nozzle |
| Answer» B. Steam | |
| 762. | The power output of Kaplan turbine ranges from |
| A. | 5 to 200 MW |
| B. | 1000 to 2000 MW |
| C. | 2000 to 3000 MW |
| D. | 5000 and above |
| Answer» A. 5 to 200 MW | |
| 763. | Kaplan turbines rotates at a rate |
| A. | Increasing |
| B. | Decreasing |
| C. | Constant |
| D. | Increasing and then decreasing |
| Answer» C. Constant | |
| 764. | What type of turbine is Kaplan? |
| A. | Impulse |
| B. | Reaction |
| C. | Energy |
| D. | Hydro |
| Answer» B. Reaction | |
| 765. | Kaplan turbine is needed to improve |
| A. | Increase Pressure |
| B. | Decrease temperature |
| C. | Change volume |
| D. | Increase efficiency |
| Answer» D. Increase efficiency | |
| 766. | Kaplan turbine is an type turbine |
| A. | Pressure |
| B. | Inward flow |
| C. | Outward flow |
| D. | Velocity |
| Answer» B. Inward flow | |
| 767. | The turbine does not have to be at the lowest point of water flow as long as the water in the draft tube is full. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 768. | The outlet of the Kaplan turbine is through |
| A. | Vane Blades |
| B. | Moving pipeline |
| C. | Draft tube |
| D. | Pump |
| Answer» C. Draft tube | |
| 769. | Kaplan turbine is most commonly used in propeller turbines. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 770. | For a Kaplan turbine, the whirl velocity at inlet of the turbine is given to be 18 m/s. The blade velocity is given as 25 m/s. What is the hydraulic efficiency for a head of 50 m. Take g = 10 m/s2? |
| A. | 80% |
| B. | 90% |
| C. | 70% |
| D. | 98% |
| Answer» B. 90% | |
| 771. | Which of the following efficiencies for Kaplan Turbine is described as the ratio between the power produced by runner to the power supplied by water at the inlet? |
| A. | Hydraulic efficiency |
| B. | Volumetric efficiency |
| C. | Mechanical efficiency |
| D. | Overall efficiency |
| Answer» A. Hydraulic efficiency | |
| 772. | The desired hydraulic efficiency of a Kaplan turbine is 98% at a whirl velocity of 20 m/s and a head of 60 m. What should be the blade velocity of the turbine at inlet in m/s? Take g = 10 m/s2. |
| A. | 40 |
| B. | 60 |
| C. | 80 |
| D. | 30 |
| Answer» D. 30 | |
| 773. | It is given that the input water power of the Kaplan turbine is 1.10 times the runner power. What would be the hydraulic efficiency of the turbine (in %)? |
| A. | 60.61 |
| B. | 70.71 |
| C. | 80.81 |
| D. | 90.91 |
| Answer» D. 90.91 | |
| 774. | Which of the following efficiencies for Kaplan Turbine is described as the ratio between total quantity of water over runner blades to total quantity of water supplied to turbine? |
| A. | Hydraulic efficiency |
| B. | Volumetric efficiency |
| C. | Mechanical efficiency |
| D. | Overall efficiency |
| Answer» B. Volumetric efficiency | |
| 775. | The volume flow rate into a Kaplan turbine is Q m3/s. 0.10Q m3/s volume of water do not flow over the runner blades. What further information is required to find the volumetric efficiency (numerical value) of the Kaplan turbine? |
| A. | The numerical value of Q |
| B. | The available head of the turbine |
| C. | The RPM or the blade velocity of the turbine |
| D. | No further information is required |
| Answer» D. No further information is required | |
| 776. | A student reports the volumetric efficiency of a Kaplan turbine to be 95%. If he measures the volume flow rate through the turbine is 40 m3/s. What is the flow rate of water over the runner blades (in m3/s)? |
| A. | 38 |
| B. | 40 |
| C. | 42.11 |
| D. | 45 |
| Answer» A. 38 | |
| 777. | 95*40 = 38 m3/s. 358. In a Kaplan turbine experiment, the volumetric efficiency of a given turbine is 91%. If volume flow rate of water in given to be 35 m3/s, find the volume of water (m3) NOT flowing over the runner blades per second? |
| A. | 4.05 |
| B. | 3.15 |
| C. | 3.30 |
| D. | 2.55 |
| Answer» B. 3.15 | |
| 778. | Which of the following efficiencies for Kaplan Turbine is defined as the ratio between the power available at the shaft of the turbine to the power produced by the runner? |
| A. | Hydraulic efficiency |
| B. | Volumetric efficiency |
| C. | Mechanical efficiency |
| D. | Overall efficiency |
| Answer» C. Mechanical efficiency | |
| 779. | The power available at the shaft of a Kaplan turbine is 0.75 MW. The volume flow rate of water in 15 m3/s, whirl velocity at inlet is 12 m/s and blade velocity is 5 m/s. Find the mechanical efficiency (in %)? |
| A. | 66.66 |
| B. | 75.00 |
| C. | 83.33 |
| D. | 91.33 |
| Answer» C. 83.33 | |
| 780. | The whirl velocity at inlet of a Kaplan turbine is 7.5 m/s and blade velocity is 5 m/s. The volume flow rate of water in 20 m3/s. Find the power output available at the shaft if the mechanical efficiency is 93% (in MW)? |
| A. | 0.831 |
| B. | 0.697 |
| C. | 1.362 |
| D. | 0.298 |
| Answer» B. 0.697 | |
| 781. | In a Kaplan Turbine experimental setup, the power output of the shaft is 4.325 MW. The volume flow rate of water in 15 m3/s at an available head of 50 m. Find the overall efficiency of the turbine in % (g = 10 m/s2)? |
| A. | 57.66 |
| B. | 83.63 |
| C. | 81.33 |
| D. | 79.95 |
| Answer» A. 57.66 | |
| 782. | The hydraulic efficiency of a Kaplan turbine is 95%, the mechanical efficiency is 93% and the volumetric efficiency is assumed to be 100%. Fine the overall efficiency (in %)? |
| A. | 80.05 |
| B. | 93.15 |
| C. | 87.55 |
| D. | 88.35 |
| Answer» D. 88.35 | |
| 783. | Which of the following efficiencies for Kaplan Turbine is defined as the ratio between the power available at the shaft to the power supplied by water at the inlet? |
| A. | Hydraulic efficiency |
| B. | Volumetric efficiency |
| C. | Mechanical efficiency |
| D. | Overall efficiency |
| Answer» D. Overall efficiency | |
| 784. | In Kaplan turbine apparatus, the volume flow rate of water in 15 m3/s at an available head of 55 m (g = 10 m/s2). Find the shaft power (in MW) if the overall efficiency of the turbine is 95%. |
| A. | 78.3 |
| B. | 7.83 |
| C. | 783 |
| D. | 0.783 |
| Answer» B. 7.83 | |
| 785. | Draft tube is also called |
| A. | Straight divergent tube |
| B. | Simple elbow tube |
| C. | Thermal tube |
| D. | Elbow tube with varying cross section |
| Answer» A. Straight divergent tube | |
| 786. | A draft tube helps in converting kinetic energy into |
| A. | Electrical work |
| B. | Mechanical work |
| C. | Chemical work |
| D. | Thermal work |
| Answer» B. Mechanical work | |
| 787. | Most common application of the draft tube is |
| A. | Rotor |
| B. | Motor |
| C. | Pump |
| D. | Filter |
| Answer» C. Pump | |
| 788. | Draft tube consists of conical diffuser with angles of |
| A. | 10 deg |
| B. | 20 deg |
| C. | 30 deg |
| D. | 40 deg |
| Answer» A. 10 deg | |
| 789. | What is the purpose of a Draft tube? |
| A. | To prevent flow separation |
| B. | To avoid Pressure drag |
| C. | To prevent rejection of heat |
| D. | To increase efficiency |
| Answer» A. To prevent flow separation | |
| 790. | What is the maximum value of efficiency in a draft tube? |
| A. | 100 |
| B. | 50 |
| C. | 90 |
| D. | 40 |
| Answer» C. 90 | |
| 791. | Turbine that consists of draft tubes is called as_ |
| A. | Impulse turbine |
| B. | Curtis turbine |
| C. | Rateau turbine |
| D. | Reaction turbine |
| Answer» D. Reaction turbine | |
| 792. | Which of the following is a 50 percent reaction turbine? |
| A. | Parsons turbine |
| B. | Curtis turbine |
| C. | Rateau turbine |
| D. | Pelton wheel |
| Answer» A. Parsons turbine | |
| 793. | The simple elbow draft tube helps to cut down the cost of excavation. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 794. | The exit diameter for a simple elbow draft tube should be |
| A. | Large |
| B. | Small |
| C. | Very small |
| D. | Same |
| Answer» A. Large | |
| 795. | Properties that do not affect a draft tube is |
| A. | Pressure |
| B. | Temperature |
| C. | Pressure velocity |
| D. | Velocity |
| Answer» B. Temperature | |
| 796. | The other name for elbow with varying cross section tube is called |
| A. | Pressure tube |
| B. | Bent draft tube |
| C. | Velocity tube |
| D. | Sink tube |
| Answer» B. Bent draft tube | |
| 797. | What is the efficiency of the simple elbow type draft tube? |
| A. | 10 |
| B. | 30 |
| C. | 60 |
| D. | 90 |
| Answer» C. 60 | |
| 798. | The horizontal portion of the draft tube is usually bent to prevent entry of air from the exit end. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 799. | The efficiency of the draft tube is ratio of |
| A. | Pressure energy by kinetic energy |
| B. | Kinetic energy by Pressure energy |
| C. | Kinetic energy into mechanical energy |
| D. | Pressure into mechanical |
| Answer» B. Kinetic energy by Pressure energy | |
| 800. | Draft tubes are not used in which of the following turbines? |
| A. | Francis |
| B. | Reaction |
| C. | Kaplan |
| D. | Pelton |
| Answer» D. Pelton | |
| 801. | The draft tube at the exit of the nozzle increases the |
| A. | Temperature |
| B. | Pressure |
| C. | Volume of the flow |
| D. | Density of flow |
| Answer» B. Pressure | |
| 802. | Efficiency of a draft tube gives |
| A. | Temperature difference |
| B. | Pressure difference |
| C. | Kinetic energy difference |
| D. | Density of flow |
| Answer» C. Kinetic energy difference | |
| 803. | Cavitation in a draft tube occurs when |
| A. | Temperature difference |
| B. | Pressure drop |
| C. | Kinetic energy difference |
| D. | Density of flow |
| Answer» B. Pressure drop | |
| 804. | Which among the following is an important parameter to avoid cavitation? |
| A. | Tail race length |
| B. | Head race length |
| C. | Height of draft tube |
| D. | Pump |
| Answer» C. Height of draft tube | |
| 805. | The draft tube is situated in the |
| A. | Inlet |
| B. | Outlet |
| C. | Tank |
| D. | Nozzle |
| Answer» B. Outlet | |
| 806. | Which equation is applied to determine the flow? |
| A. | Newtons equation |
| B. | Rutherford’s equation |
| C. | Bernoulli’s equation |
| D. | Faradays equation |
| Answer» C. Bernoulli’s equation | |
| 807. | Height of the draft tube is denoted by |
| A. | H |
| B. | h |
| C. | z |
| D. | x |
| Answer» C. z | |
| 808. | Draft tube allows turbine to be placed above the tail race. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 809. | The efficiency of the draft tube depends on the |
| A. | Heat |
| B. | Pressure |
| C. | Temperature |
| D. | Pressure and temperature |
| Answer» D. Pressure and temperature | |
| 810. | Draft tubes have shafts |
| A. | Horizontal |
| B. | Vertical |
| C. | Circular |
| D. | Cross sectional |
| Answer» B. Vertical | |
| 811. | Draft tubes are situated at the outlet in |
| A. | Pelton |
| B. | Reaction |
| C. | Kaplan |
| D. | Francis |
| Answer» A. Pelton | |
| 812. | Efficiency of a draft tube is directly proportional to its |
| A. | Temperature |
| B. | Pressure |
| C. | Velocity |
| D. | Density |
| Answer» C. Velocity | |
| 813. | Z is a draft tube is |
| A. | Temperature difference |
| B. | Pressure drop |
| C. | Kinetic energy difference |
| D. | Datum head |
| Answer» D. Datum head | |
| 814. | Draft tube operates at |
| A. | Same efficiency |
| B. | Different efficiency |
| C. | Turbine |
| D. | Pump |
| Answer» A. Same efficiency | |
| 815. | The draft tube is an |
| A. | Interior tube |
| B. | Exterior tube |
| C. | Tank depth alternator |
| D. | Nozzle tube |
| Answer» B. Exterior tube | |
| 816. | What type of pressure does the draft tube depend upon? |
| A. | Gauge pressure |
| B. | Atm pressure |
| C. | Normal pressure |
| D. | Normal and Atm pressure |
| Answer» A. Gauge pressure | |
| 817. | Gauge pressure of the draft tube is denoted by |
| A. | P |
| B. | h |
| C. | z |
| D. | x |
| Answer» A. P | |
| 818. | Draft tube allows turbine to be placed below the tail race. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» B. False | |
| 819. | Specific speed is denoted by |
| A. | N |
| B. | n |
| C. | Ns |
| D. | S |
| Answer» C. Ns | |
| 820. | Specific speeds are used in pumps to determine |
| A. | Temperature |
| B. | Reaction speed |
| C. | Suction specific speed |
| D. | Wheel speed |
| Answer» C. Suction specific speed | |
| 821. | The tube at the exit of the nozzle increases the |
| A. | Temperature |
| B. | Pressure |
| C. | Volume of the flow |
| D. | Density of flow |
| Answer» B. Pressure | |
| 822. | Specific speed is used to characterize |
| A. | Turbomachinery speed |
| B. | Flow speed |
| C. | Energy flow |
| D. | Heat generated |
| Answer» A. Turbomachinery speed | |
| 823. | Specific speed predicts the shape of a/an |
| A. | Pump |
| B. | Density head |
| C. | Impeller |
| D. | Motor |
| Answer» C. Impeller | |
| 824. | What helps in categorizing the impellers? |
| A. | Quasi static number |
| B. | Rotor |
| C. | Height of draft tube |
| D. | Pump |
| Answer» A. Quasi static number | |
| 825. | Imperial units is defined as |
| A. | Temperature by pressure |
| B. | Tail race and head race |
| C. | Revolutions per minute |
| D. | Turbine performance |
| Answer» C. Revolutions per minute | |
| 826. | Ratio of pump or turbine with reference pump or turbine is called as |
| A. | Efficiency |
| B. | Performance |
| C. | Heat generated |
| D. | Relative velocity |
| Answer» B. Performance | |
| 827. | Low specific speed in hydraulic head is developed due to |
| A. | Mass flow rate |
| B. | Increase in temperature |
| C. | Centrifugal force |
| D. | Increase in pressure |
| Answer» C. Centrifugal force | |
| 828. | Centrifugal pump impellers have speed ranging from |
| A. | 500- 10000 |
| B. | 50- 100 |
| C. | 200-300 |
| D. | 0-50 |
| Answer» A. 500- 10000 | |
| 829. | What is the unit of specific speed in metric system? |
| A. | m.s |
| B. | m/s |
| C. | m3/s |
| D. | m |
| Answer» C. m3/s | |
| 830. | Specific speed develop a hydraulic flow through the centrifugal pumps. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 831. | Net suction speed is used in problems with cavitation. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 832. | The runner diameter in a turbine is denoted as |
| A. | A |
| B. | Dr |
| C. | Rr |
| D. | De |
| Answer» D. De | |
| 833. | Specific speed is the speed of the turbine which is similar to its |
| A. | Temperature difference |
| B. | Pressure difference |
| C. | Aspect ratio |
| D. | Speed of rotor |
| Answer» C. Aspect ratio | |
| 834. | Specific speed develops a unit power under a unit |
| A. | Temperature |
| B. | Pressure |
| C. | Volume of the flow |
| D. | Head |
| Answer» D. Head | |
| 835. | Impeller in a motor is used to |
| A. | Change temperatures |
| B. | Change Pressure |
| C. | Kinetic energy change |
| D. | Change density |
| Answer» B. Change Pressure | |
| 836. | Hydraulic head is also called as |
| A. | Pressure head |
| B. | Density head |
| C. | Kinetic head |
| D. | Piezometric head |
| Answer» D. Piezometric head | |
| 837. | Specific speed of a Pelton wheel with single jet is |
| A. | 8.5 to 30 |
| B. | 30 to 51 |
| C. | 51 to 225 |
| D. | 230 to 500 |
| Answer» A. 8.5 to 30 | |
| 838. | Specific speed is an index used to predict |
| A. | Head race distance |
| B. | Tail race distance |
| C. | Tank dimensions |
| D. | Turbine performance |
| Answer» D. Turbine performance | |
| 839. | Specific speed of a Pelton wheel with multiple jets is |
| A. | 8.5 to 30 |
| B. | 30 to 51 |
| C. | 51 to 225 |
| D. | 230 to 500 |
| Answer» B. 30 to 51 | |
| 840. | Specific speed of a Francis turbine is |
| A. | 8.5 to 30 |
| B. | 30 to 51 |
| C. | 51 to 225 |
| D. | 230 to 500 |
| Answer» C. 51 to 225 | |
| 841. | Specific speed of a Kaplan turbine is |
| A. | 8.5 to 30 |
| B. | 30 to 51 |
| C. | 51 to 225 |
| D. | 355 to 860 |
| Answer» D. 355 to 860 | |
| 842. | Specific speed less than 500 are called |
| A. | Positive displacement pumps |
| B. | Negative displacement pumps |
| C. | Draft tubes |
| D. | Tanks |
| Answer» A. Positive displacement pumps | |
| 843. | With the increase in specific speeds, |
| A. | Head race distance increases |
| B. | Tail race distance increases |
| C. | Tank dimensions increases |
| D. | Diameters of impeller increases |
| Answer» D. Diameters of impeller increases | |
| 844. | Specific speed is used to predict desired pump or turbine performance. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 845. | Once we know the desired functions of the specific speed, it is easier to calculate its components units. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 846. | Which among the following is not a unit quantity of turbine? |
| A. | Unit speed |
| B. | Unit discharge |
| C. | Unit power |
| D. | Unit temperature |
| Answer» D. Unit temperature | |
| 847. | What does DMU stand for? |
| A. | Density matter usage |
| B. | Direct material usage |
| C. | Density material usage |
| D. | Depth matter usage |
| Answer» B. Direct material usage | |
| 848. | Unit speed is the speed of the turbine operating under_ |
| A. | One-meter head |
| B. | Pressure head |
| C. | Volumetric head |
| D. | Draft tube |
| Answer» A. One-meter head | |
| 849. | One dyne is equal to N. |
| A. | 10 |
| B. | 100 |
| C. | 1000 |
| D. | 10-5 |
| Answer» D. 10-5 | |
| 850. | What is symbol for unit speed? |
| A. | S |
| B. | N |
| C. | Ns |
| D. | Nu |
| Answer» D. Nu | |
| 851. | Unit speed of a single jet in a turbine is |
| A. | 100 m/s |
| B. | 300 m/s |
| C. | 500 m/s |
| D. | 800 m/s |
| Answer» D. 800 m/s | |
| 852. | Unit speed is directly proportional to |
| A. | Head race distance |
| B. | Specific speed |
| C. | Pressure |
| D. | Turbine performance |
| Answer» B. Specific speed | |
| 853. | Unit discharge is the discharge through the turbine when the head of the turbine is |
| A. | High |
| B. | Zero |
| C. | Unity |
| D. | Low |
| Answer» C. Unity | |
| 854. | 9 Unit discharge is denoted as |
| A. | Du |
| B. | Qu |
| C. | Su |
| D. | Nu |
| Answer» B. Qu | |
| 855. | Unit discharge is directly proportional to |
| A. | Head race distance |
| B. | Discharge of fluid in the turbine. |
| C. | Pressure |
| D. | Turbine performance |
| Answer» B. Discharge of fluid in the turbine. | |
| 856. | Unit quantities are physical quantities |
| A. | With numerical variables |
| B. | Without numerical variables |
| C. | With different sets |
| D. | With unit difference |
| Answer» B. Without numerical variables | |
| 857. | Dyne cm is a Torque measurement unit. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 858. | Unit quantities play an important role in determining the dimensional quantities. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 859. | Unit power is developed by the turbine when the head of the turbine is unity. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 860. | Constant head curves are also called as |
| A. | Head race curves |
| B. | Tail race curves |
| C. | Main characteristic curves |
| D. | Impeller curves |
| Answer» C. Main characteristic curves | |
| 861. | The speed of the turbine in a constant head curve is varied by |
| A. | Temperature change |
| B. | Reaction speed change |
| C. | Changing the gate opening |
| D. | Wheel speed change |
| Answer» C. Changing the gate opening | |
| 862. | Constant speed curves travel at constant speed when the value is equal to |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1 | |
| 863. | Power of a turbine is measured |
| A. | Mechanically |
| B. | Electrically |
| C. | Chemically |
| D. | Thermally |
| Answer» A. Mechanically | |
| 864. | Which among the following is not a parameter to determine the efficiency of the turbine? |
| A. | Unit speed |
| B. | Unit power |
| C. | Unit volume |
| D. | Unit discharge |
| Answer» C. Unit volume | |
| 865. | Which among the following is not an important parameter to determine the performance of the turbine? |
| A. | Speed |
| B. | Discharge |
| C. | Head |
| D. | Volume of tank |
| Answer» D. Volume of tank | |
| 866. | Which among the following is not a type of curve? |
| A. | Logarithimic curve |
| B. | Straight curve |
| C. | Pressure vs power |
| D. | Efficiency vs speed |
| Answer» C. Pressure vs power | |
| 867. | The inlet passage of water entry is controlled by |
| A. | Head race |
| B. | Gate |
| C. | Tail race |
| D. | Pump |
| Answer» B. Gate | |
| 868. | Overall efficiency vs what is drawn to determine the turbine performance? |
| A. | Unit Discharge |
| B. | Unit speed |
| C. | Unit power |
| D. | Unit pressure |
| Answer» B. Unit speed | |
| 869. | Constant discharge takes place due to |
| A. | Unit Discharge |
| B. | Unit speed |
| C. | Unit power |
| D. | Unit pressure |
| Answer» B. Unit speed | |
| 870. | All the characteristic curves are drawn with respect to |
| A. | Unit Discharge |
| B. | Unit speed |
| C. | Unit power |
| D. | Unit pressure |
| Answer» B. Unit speed | |
| 871. | In constant speed curves, the speed is kept a constant varying its head. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 872. | In all the characteristic curves, the overall efficiency is aimed at the maximum value. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 873. | Constant efficiency curves are plotted using |
| A. | Constant head curves |
| B. | Constant speed curves |
| C. | Main characteristic curves |
| D. | Constant speed and constant head |
| Answer» D. Constant speed and constant head | |
| 874. | Constant speed curves are also called as |
| A. | Main characteristic curves |
| B. | Turbine curves |
| C. | Tail race curves |
| D. | Impeller curves |
| Answer» C. Tail race curves | |
| 875. | Constant speed curve is denoted as |
| A. | T |
| B. | V |
| C. | c |
| D. | V |
| Answer» C. c | |
| 876. | Constant speed curves are |
| A. | Scalar quantities |
| B. | Vector quantities |
| C. | Constant quantities |
| D. | Different conditions |
| Answer» B. Vector quantities | |
| 877. | Constant speed is measured |
| A. | Mechanically |
| B. | Electrically |
| C. | Chemically |
| D. | Thermally |
| Answer» A. Mechanically | |
| 878. | Constant speed curves are determined by the |
| A. | Arc length |
| B. | Power |
| C. | Heat |
| D. | Temperature |
| Answer» C. Heat | |
| 879. | Which component is necessary for writing the velocity equation? |
| A. | Cos component |
| B. | Sine Component |
| C. | Cos and sine component |
| D. | Independent |
| Answer» C. Cos and sine component | |
| 880. | Which among the following is not a shape for a curve? |
| A. | Logarithmic curve |
| B. | Helix curve |
| C. | Straight curve |
| D. | Speed curve |
| Answer» D. Speed curve | |
| 881. | How do we plot points in a curve? |
| A. | Analytical approach |
| B. | General approach |
| C. | Tail approach |
| D. | Head approach |
| Answer» A. Analytical approach | |
| 882. | Plotting sine curve will take place along the |
| A. | y axis |
| B. | x axis |
| C. | z axis |
| D. | x and z |
| Answer» B. x axis | |
| 883. | In analytical approach, dp= |
| A. | vdt |
| B. | v |
| C. | dt |
| D. | dx |
| Answer» A. vdt | |
| 884. | The equation is general approach is called as central difference. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 885. | The approximate value of the constant speed curve is given by ratio of |
| A. | dy/dp |
| B. | dx/dp |
| C. | dt/dx |
| D. | dt/dy |
| Answer» A. dy/dp | |
| 886. | In constant speed curves, the velocity is kept a constant varying its head. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» B. False | |
| 887. | The performance of a characteristic curve is kept at a high value. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 888. | In nozzle governing, the flow rate of steam is regulated by |
| A. | Nozzles |
| B. | Pumping |
| C. | Drafting |
| D. | Intercooling |
| Answer» A. Nozzles | |
| 889. | The flow rate of steam is controlled by regulating the |
| A. | Steam |
| B. | Pressure |
| C. | Temperature |
| D. | Speed |
| Answer» B. Pressure | |
| 890. | What is primary objective of steam turbine governing? |
| A. | Maintain constant speed |
| B. | Maintain constant pressure |
| C. | Maintain constant temperature |
| D. | Maintain constant expansion |
| Answer» A. Maintain constant speed | |
| 891. | What is the purpose of a steam turbine governing? |
| A. | Controls speed |
| B. | Controls flow rate |
| C. | Controls volume |
| D. | Controls discharge |
| Answer» B. Controls flow rate | |
| 892. | The advantage of nozzle governing is that no regulating pressure is applied. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 893. | During the steam turbine governing, what remains a constant? |
| A. | Speed of rotation |
| B. | Flow rate |
| C. | Pump head |
| D. | Volume of fluid |
| Answer» A. Speed of rotation | |
| 894. | When do we apply by pass governing? |
| A. | When turbine is overloaded |
| B. | When Unit speed decreases |
| C. | When Unit power increases |
| D. | When Unit pressure decreases |
| Answer» A. When turbine is overloaded | |
| 895. | When bypass valve is opened to |
| A. | Increase Pressure |
| B. | Increase Unit speed |
| C. | Increase Unit power |
| D. | Increase the amount of fresh steam |
| Answer» D. Increase the amount of fresh steam | |
| 896. | What is the unit of steam rate? |
| A. | kg |
| B. | kg/m |
| C. | kg/kWh |
| D. | N/m |
| Answer» C. kg/kWh | |
| 897. | With the increase in load, Energy in the turbine |
| A. | Decreases |
| B. | Increases |
| C. | Remains same |
| D. | Independent |
| Answer» A. Decreases | |
| 898. | Combination governing involves usage of two or more governing. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 899. | When the mechanical speed of the shaft increases beyond 110 percent, we use |
| A. | Throttle governing |
| B. | Steam governing |
| C. | Nozzle governing |
| D. | Emergency governing |
| Answer» D. Emergency governing | |
| 900. | When the balancing of the turbine is disturbed, we use |
| A. | Throttle governing |
| B. | Steam governing |
| C. | Nozzle governing |
| D. | Emergency governing |
| Answer» D. Emergency governing | |
| 901. | The flow rate of steam is controlled by regulating the_ |
| A. | Steam |
| B. | Pressure |
| C. | Temperature |
| D. | Speed |
| Answer» B. Pressure | |
More MCQs
| 902. | If Velocity, pressure, density etc., do not change at a point with respect to time, flow is called |
| A. | uniform |
| B. | incompressible |
| C. | non-uniform |
| D. | steady |
| Answer» D. steady | |
| 903. | If velocity, pressure, density etc., change at a point with respect to time, flow is called |
| A. | uniform |
| B. | compressible |
| C. | unsteady |
| D. | incompressible |
| Answer» C. unsteady | |
| 904. | If the velocity in a fluid flow does not change with respect to length of direction of flow, it is called |
| A. | steady flow |
| B. | uniform flow |
| C. | incompressible |
| D. | rotational |
| Answer» B. uniform flow | |
| 905. | If the velocity in a fluid flow change with respect to length of direction of flow, it is called |
| A. | unsteady flow |
| B. | compressible flow |
| C. | irrotational flow |
| D. | none of the above |
| Answer» D. none of the above | |
| 906. | If the density of the fluid is constant from point to point in a flow region, it is called |
| A. | steady flow. |
| B. | incompressible flow |
| C. | uniform flow |
| D. | rotational flow. |
| Answer» B. incompressible flow | |
| 907. | If the density of the flow changes from point to point in a flow region, it is called |
| A. | steady flow. |
| B. | unsteady flow |
| C. | non uniform |
| D. | compressible |
| Answer» D. compressible | |
| 908. | Chezy’s Formula is given as |
| A. | v= s√(rc) |
| B. | v= c √(rs) |
| C. | v= r √(cs) |
| D. | none of the above. |
| Answer» B. v= c √(rs) | |
| 909. | The discharge through the trapezoidal channel is maximum when |
| A. | half of the top width= sloping side |
| B. | top width= half of the sloping side |
| C. | top width= 1.5 x sloping side |
| D. | none of the above |
| Answer» A. half of the top width= sloping side | |
| 910. | The maximum velocity through a circular channel when depth flow is equal to |
| A. | 0.95 x diameter |
| B. | 0.5 x diameter |
| C. | 0.81 x diameter |
| D. | none of the above |
| Answer» C. 0.81 x diameter | |
| 911. | The maximum discharge through a circular channel takes place when depth of flow is equal to |
| A. | 0.95 x diameter |
| B. | 0.3 x diameter |
| C. | 0.81 x diameter |
| D. | 0.5 x diameter |
| Answer» A. 0.95 x diameter | |
| 912. | The most economical section is one for which a given cross sectional area, the slope of the bed (s) and coefficient of resistance has |
| A. | maximum wetted perimeter |
| B. | maximum discharge |
| C. | maximum depth of flow |
| D. | none of the above |
| Answer» B. maximum discharge | |
| 913. | A hydraulically efficient trapezoidal section has a side slopes of 2 horizontal :1 vertical. The ratio of the bed width to depth B/y in this channel is |
| A. | 4.94 |
| B. | 2.19 |
| C. | 0.472 |
| D. | 0.236 |
| Answer» C. 0.472 | |
| 914. | al to 2m and 1m respectively. If the flow is uniform and the value of Chezy’s constant is 60, the discharge through the channel is |
| A. | 1.0 m3/s |
| B. | 1.5m3/s |
| C. | 2.0m3/s |
| D. | 3.0m3/s |
| Answer» B. 1.5m3/s | |
| 915. | A hydraulic jump takes place in a horizontal rectangular channel from a depth of 0.20m to 2.40m The discharge in the channel in m3/s per meter width is… |
| A. | 2.47 |
| B. | 12.0 |
| C. | 3.2 |
| D. | 0.08 |
| Answer» A. 2.47 | |
| 916. | A hydraulic jump occurs at the top of a spillway. The depth before jump is 0.2m. The sequent depth is 3.2m. What is the energy dissipated in m (approximate)? |
| A. | 27 |
| B. | 10.5 |
| C. | 15 |
| D. | 42 |
| Answer» B. 10.5 | |
| 917. | The hydraulic jump always occurs from |
| A. | a m2 curve to a m1 curve |
| B. | a h3 curve to a h1 curve |
| C. | below normal depth to above normal depth |
| D. | below critical depth to above critical depth |
| Answer» D. below critical depth to above critical depth | |
| 918. | In a horizontal rectangular channel a hydraulic jump with a sequent depth ratio of 5.0 is formed. This jump can be classified as |
| A. | weak jump |
| B. | oscillating jump |
| C. | strong jump |
| D. | steady jump |
| Answer» B. oscillating jump | |
| 919. | For a given discharge in a horizontal frictionless channel two depths may have the same specific force. These two depths are known as… |
| A. | sudden depth |
| B. | conjugate depths |
| C. | sequent depths |
| D. | normal and critical depths |
| Answer» C. sequent depths | |
| 920. | A turbine is a device, which converts |
| A. | hydraulic energy into mechanical energy |
| B. | mechanical energy into hydraulic energy |
| C. | kinetic energy into mechanical energy |
| D. | electrical energy into mechanical energy |
| Answer» A. hydraulic energy into mechanical energy | |
| 921. | An impulse turbine: |
| A. | is always operates submerged |
| B. | is makes use of draft tube |
| C. | is most suited for low head installation |
| D. | operates by initial complete conversion to kinetic head |
| Answer» D. operates by initial complete conversion to kinetic head | |
| 922. | An impulse turbine is installed |
| A. | always above the tail race |
| B. | always submerged |
| C. | depends on flow situation |
| D. | partly submerged |
| Answer» A. always above the tail race | |
| 923. | A Pelton turbine is |
| A. | an impulse turbine |
| B. | a tangential flow |
| C. | high had and low specific speed turbine |
| D. | all of the above |
| Answer» D. all of the above | |
| 924. | The reaction turbine is one in which the available hydraulic energy is converted to kinetic energy before the fluid enters the runner |
| A. | fully |
| B. | partially |
| C. | fully or partially |
| D. | fully and partially |
| Answer» B. partially | |
| 925. | The function of draft tube is |
| A. | recuperation of energy |
| B. | to make it possible to establish the turbine above tail race |
| C. | both (a) and (b) |
| D. | none |
| Answer» C. both (a) and (b) | |
| 926. | A draft tube is a part of the installation of a |
| A. | propeller turbine |
| B. | pelton turbine |
| C. | turbine impulse wheel |
| D. | all the turbines |
| Answer» A. propeller turbine | |
| 927. | A turbine develops 3417hp at 240 r.p.m. The torque in the shaft is |
| A. | 400kn.m |
| B. | 3335kn.m |
| C. | 1000kn.m |
| D. | 100kn.m |
| Answer» D. 100kn.m | |
| 928. | A reaction turbine discharges 50m3/sec of water under a head of 7.5m with an overall efficiency of 80%. The H.P. Developed is: |
| A. | 5000 |
| B. | 300 |
| C. | 4000 |
| D. | 400 |
| Answer» C. 4000 | |
| 929. | To generate 8.1 MW under a head of 81m while working at a speed of 540rpm, what type of turbine is suitable? |
| A. | pelton wheel |
| B. | francis turbine |
| C. | kaplan turbine |
| D. | propeller turbine |
| Answer» B. francis turbine | |
| 930. | A turbine works at 20 m head and speed of 500 rpm. Its 1:2 scale model to be tested at same head should have a rotational speed of |
| A. | 1000rpm |
| B. | 750rpm |
| C. | 500rpm |
| D. | 250rpm |
| Answer» D. 250rpm | |
| 931. | The speed ratio of an impulse turbine operating under a head off 400m is 0.46. The p.c.d of turbine wheel is 22.25m then rotational speed, in rpm is |
| A. | 245 |
| B. | 346 |
| C. | 692 |
| D. | 946 |
| Answer» B. 346 | |
| 932. | Mechanical efficiency of a turbine is the ratio of |
| A. | power at the inlet to the power at the shaft of turbine |
| B. | power at the shaft to the power given to the runner |
| C. | power at the shaft to the power at the inlet of turbine |
| D. | none of the above |
| Answer» B. power at the shaft to the power given to the runner | |
| 933. | The overall efficiency of the turbine is the ratio of |
| A. | power at the inlet of the turbine to the power at the shaft |
| B. | power at the shaft to the power given to the runner |
| C. | power at the shaft to the power at the inlet of turbine |
| D. | none of the above |
| Answer» C. power at the shaft to the power at the inlet of turbine | |
| 934. | The relation between hydraulic efficiency (ηh), mechanical efficiency (ηm) and overall efficiency (ηo) is |
| A. | ??h= ??o x ??m |
| B. | ??o= ??h x ??m |
| C. | ??o= ??m/??h |
| D. | none off the above |
| Answer» B. ??o= ??h x ??m | |
| 935. | Specific speed of the turbine is defined as the speed at which the turbine runs when |
| A. | working under unit head and discharging one liter per second |
| B. | working under unit head and develops unit horse power |
| C. | develops unit horse power and discharges one liter per second |
| D. | none of the above |
| Answer» B. working under unit head and develops unit horse power | |
| 936. | The Unit speed is the speed of a turbine when it is working |
| A. | under unit head and develops unit power |
| B. | under unit head and discharge one m3/sec |
| C. | under unit head |
| D. | none of the above |
| Answer» C. under unit head | |
| 937. | The ratio of actual work available at the turbine to the energy imparted to the wheel is known as _____________ efficiency. |
| A. | hydraulic |
| B. | mechanical |
| C. | overall |
| D. | none of the above |
| Answer» B. mechanical | |
| 938. | Which of the following turbine is preferred 0 to 25m head of water? P |
| A. | ge 4 of 11a) pelton wheel |
| B. | kaplan turbine |
| C. | francis turbine |
| D. | none of the above |
| Answer» B. kaplan turbine | |
| 939. | A Francis turbine is used when the available head of water is |
| A. | 0 to 25m |
| B. | 25 to 250m |
| C. | above 250m |
| D. | none of these |
| Answer» C. above 250m | |
| 940. | The unit discharge through the turbine is |
| A. | q/√h |
| B. | q/h |
| C. | q/h3/2 |
| D. | q/h2 |
| Answer» A. q/√h | |
| 941. | The differential equation of the gradually varied flow can be written by using Manning’s Formula for the case off a wide rectangular channel as (dy/dx) = |
| A. | s0{[1-(yn/y)3.33]/[1-(yn/y)3]} |
| B. | s0{[1-(yc/y)3.33]/[1-(yc/y)3]} |
| C. | s0{[1-(yn/y)3]/[1-(yn/y)3]} |
| D. | s0{[1-(yo/yc)3]/[1-(yn/y)3.33]} |
| Answer» A. s0{[1-(yn/y)3.33]/[1-(yn/y)3]} | |
| 942. | If E = specific energy at a section in a gradually varied flow, then (dE/dx) = |
| A. | s0+sf |
| B. | s0-sf |
| C. | sf-s0 |
| D. | sfs0-1 |
| Answer» B. s0-sf | |
| 943. | ation Select the correct answer using the codes given below: |
| A. | 1,2 and 3 |
| B. | 1 and 3 only |
| C. | 1 and 2 only |
| D. | 2 and 3 only |
| Answer» A. 1,2 and 3 | |
| 944. | Calculate the value of rate of change of specific energy for a triangular channel having depth 3.5m and the side slope is 1H:2V. Given: V=2.5m/s, dy/dx= 8.6×10-4 |
| A. | 3.74×10-4m |
| B. | 4.47 x10-4m |
| C. | 5.47 x10-4m |
| D. | 6.47 x10-4m |
| Answer» C. 5.47 x10-4m | |
| 945. | Calculate the value of Sf for trapezoidal channel having depth 2m, width 5m and side slope of 1H:1.5V. Given: dy/dx= 1.18×10-3, S0= 1 in 1000, C= 50. |
| A. | 0.00001 |
| B. | 0.00002 |
| C. | 0.00003 |
| D. | 0.00004 |
| Answer» A. 0.00001 | |
| 946. | When S0 is equal to zero, it is called —– |
| A. | adverse slope |
| B. | horizontal slope |
| C. | critical slope |
| D. | mild slope |
| Answer» B. horizontal slope | |
| 947. | Hydraulic radius for wide rectangular channel section is— |
| A. | 3y |
| B. | 2y |
| C. | y |
| D. | y/2 |
| Answer» C. y | |
| 948. | Specific energy in GVF changes only under which of the following conditions: |
| A. | difference between bed slope and slope of the energy line |
| B. | both bed slope and energy slope are equal |
| C. | presence of bed slope alone |
| D. | presence of energy slope alone |
| Answer» A. difference between bed slope and slope of the energy line | |
| 949. | When Yn is greater than Yc and So greater than 0, it is called as —- |
| A. | adverse |
| B. | horizontal |
| C. | critical |
| D. | mild |
| Answer» D. mild | |
| 950. | A slope based on the culvert bottom is called—- |
| A. | hydraulic slope |
| B. | hydraulic curve |
| C. | adverse slope |
| D. | horizontal slope |
| Answer» A. hydraulic slope | |
| 951. | When S0 greater than 0 and Yn less than Yc it is called as |
| A. | adverse |
| B. | horizontal |
| C. | critical |
| D. | steep |
| Answer» D. steep | |
| 952. | Which of the following assumptions are true in case of GVF? |
| A. | flow is not steady |
| B. | stream lines are parallel |
| C. | pressure distribution is not hydrostatic |
| D. | channel has varying alignment and shape |
| Answer» B. stream lines are parallel | |
| 953. | What happens to depth of flow when there is obstruction in path |
| A. | remains same |
| B. | increases |
| C. | decreases |
| D. | flow stops |
| Answer» B. increases | |
| 954. | Calculate the value of Froud’s number if the ratio of rate of change of specific energy and rate of change of depth is 0.9. |
| A. | 0.29 |
| B. | 0.30 |
| C. | 0.31 |
| D. | 0.32 |
| Answer» C. 0.31 | |
| 955. | If the difference between specific energies is 2m, calculate the rate of change of specific energies if the length of backwater curve is 26314 m. |
| A. | 6.6×10-5m |
| B. | 7.6 x10-5m |
| C. | 8.6 x10-5m |
| D. | 9.6 x10-5m |
| Answer» B. 7.6 x10-5m | |
| 956. | When gravitational force is equal to the friction drag, what type of depth is formed? P |
| A. | ge 9 of 11a) critical depth |
| B. | normal depth |
| C. | cylindrical depth |
| D. | conical depth |
| Answer» B. normal depth | |
| 957. | Determine the length of backwater curve if E1=2.8m, E2=5.6m, S0=0.00009, Sf= 0.00004. |
| A. | 26000m |
| B. | 36000m |
| C. | 46000m |
| D. | 56000m |
| Answer» D. 56000m | |
| 958. | Calculate the bed slope of the channel if the slop of the energy line is 0.00024 and the length of backwater curve is 104166.67m. If E1-E2= 3m. |
| A. | 2.28x 10-5 |
| B. | 3.28 x10-5 |
| C. | 4.28 x10-5 |
| D. | 5.28 x10-5 |
| Answer» D. 5.28 x10-5 | |
| 959. | calculate the frictional slope of a triangular channel having depth 2.5m and side slope of 1H:2V. If the rate of change of specific energy is 1.6 x10-5m/s, If V= 1.57 m/s. |
| A. | 5.53 x10-4m |
| B. | 6.53 x10-4m |
| C. | 7.53 x10-4m |
| D. | 8.53 x10-4m |
| Answer» C. 7.53 x10-4m | |
| 960. | The force exerted by jet of the water on stationary vertical plate in the direction of the jet is given by |
| A. | fx= ??av2sin2?? |
| B. | fx= ??av2(1+cos??) |
| C. | fx= ??av2 |
| D. | none of the above |
| Answer» C. fx= ??av2 | |
| 961. | The force exerted by jet of the water on stationary inclined plate in the direction of the jet is given by |
| A. | fx= ??av2 |
| B. | fx= ??av2sin2?? |
| C. | fx= ??av2 (1+cos??) |
| D. | fx= ??av2 (1+sin??) |
| Answer» B. fx= ??av2sin2?? | |
| 962. | The force exerted by jet of the water on stationary curved plate in the direction of the jet is given by |
| A. | fx = ??av2sin2?? |
| B. | fx = ??av2(1+cos??) |
| C. | fx = ??av2 |
| D. | fx = ??av2 (1+sin??) |
| Answer» B. fx = ??av2(1+cos??) | |
| 963. | The force exerted by jet of the water having velocity V on a vertical plate moving with a velocity u is given by |
| A. | fx = ??a(v-u) 2sin2?? |
| B. | fx = ??a(v-u) 2 |
| C. | fx = ??a(v-u) 2 [1+cos??] |
| D. | none of the above |
| Answer» B. fx = ??a(v-u) 2 | |
| 964. | The force exerted by jet of the water having velocity V on a series of vertical plate moving with a velocity u is given by, |
| A. | fx= ??av2. |
| B. | fx = ??a(v-u) 2 |
| C. | fx = ??avu. |
| D. | none of the above. |
| Answer» A. fx= ??av2. | |
| 965. | Efficiency of the jet of the water having velocity V & Striking a series if vertical plates moving with a velocity u is given by, |
| A. | [2v(v-u)]/u2 |
| B. | [2u(v-u)]/v2 |
| C. | u2/[v2(v-u)] |
| D. | none of the above. |
| Answer» B. [2u(v-u)]/v2 | |
| 966. | Efficiency off the jet of the water having velocity V & Striking a series of vertical plates moving with a velocity u, is maximum when |
| A. | 1/g (vw1u1 + vw2u2) |
| B. | 1/g[v1u1+v2u2] |
| C. | 1/g[vw1u1??vw2u2.] |
| D. | none of the above |
| Answer» D. none of the above | |
| 967. | For a series o curved radial vanes, the work done per second per unit weight is equal to |
| A. | 1/g (vw1u1 + vw2u2) |
| B. | 1/g[v1u1+v2u2] |
| C. | 1/g[vw1u1??vw2u2.] |
| D. | none of the above |
| Answer» C. 1/g[vw1u1??vw2u2.] | |
| 968. | The work done by centrifugal pump on water per second per unit weight of water is given by |
| A. | 1/g[vw1u1] |
| B. | 1/g[vw2u2] |
| C. | 1/g[vw2u2-vw1u1] |
| D. | none of the above |
| Answer» B. 1/g[vw2u2] | |
| 969. | The manometric head Hm of a centrifugal pump is given by |
| A. | pressure head at the outlet of the pump – pressure head at the inlet |
| B. | total head at inlet – total head at outlet |
| C. | total head at outlet – total head at inlet |
| D. | none of the above |
| Answer» C. total head at outlet – total head at inlet | |
| 970. | The manometric efficiency (ηman) of a centrifugal pump is given by |
| A. | hm/gvw2u2 |
| B. | ghm/vw2u2 |
| C. | vw2u2/ghm |
| D. | gvw2u2/hm |
| Answer» B. ghm/vw2u2 | |
| 971. | Mechanical efficiency (ηmech) of a centrifugal pump is given by |
| A. | (power at the impeller)/ s.h.p. |
| B. | s.h.p/ power at the impeller |
| C. | power possessed by water/ power at the impeller |
| D. | power possessed by water/ s.h.p |
| Answer» A. (power at the impeller)/ s.h.p. | |
| 972. | To produce a high head by multistage centrifugal pumps, the impellers are connected… P |
| A. | ge 3 of 7a) in parallel |
| B. | in series |
| C. | in parallel and in series both |
| D. | none of the above |
| Answer» B. in series | |
| 973. | To discharge a large quantity of liquid by multi-stage centrifugal pump, the impellers are connected |
| A. | in parallel |
| B. | in series |
| C. | in parallel and in series both |
| D. | none of the above |
| Answer» A. in parallel | |
| 974. | Specific speed of a pump is the speed at which a pump runs when |
| A. | head developed is unity and discharge is one cubic meter |
| B. | head developed is unity and shat horse power is also unity |
| C. | discharge is one cubic meter and shaft horse power is unity |
| D. | none of the above |
| Answer» A. head developed is unity and discharge is one cubic meter | |
| 975. | The specific speed (Ns) of aa pump is given by thee expression |
| A. | ns= [n√q]/[hm5/4] |
| B. | ns= [n√p]/[hm3/4] |
| C. | ns= [n√q]/[hm3/4] |
| D. | ns= [n√p]/[hm5/4] |
| Answer» C. ns= [n√q]/[hm3/4] | |
| 976. | Cavitation will take place if the pressure of the flowing fluid at any point is P |
| A. | ge 4 of 7a) more than vapor pressure of the fluid |
| B. | equal to vapor pressure of the fluid |
| C. | is less than vapor pressure of the fluid |
| D. | none of the above |
| Answer» C. is less than vapor pressure of the fluid | |
| 977. | Cavitation can take place in case of |
| A. | pelton wheel |
| B. | francis turbine |
| C. | reciprocating pump |
| D. | centrifugal pump |
| Answer» B. francis turbine | |
| 978. | Air vessel in reciprocating pump is used |
| A. | to obtain continuous supply of water at uniform rate |
| B. | to reduce suction head |
| C. | to increase the delivery head |
| D. | none of the above |
| Answer» A. to obtain continuous supply of water at uniform rate | |
| 979. | During suction stroke of a reciprocating pump, the separation may take place |
| A. | at the end of the suction stroke |
| B. | in the middle of the suction stroke |
| C. | in the beginning of the suction stroke |
| D. | non off the above |
| Answer» C. in the beginning of the suction stroke | |
| 980. | During delivery stroke of a reciprocating pump, the separation may take place P |
| A. | ge 5 of 7a) at the end of the suction stroke |
| B. | in the middle of the suction stroke |
| C. | in the beginning of the suction stroke |
| D. | non off the above |
| Answer» A. ge 5 of 7a) at the end of the suction stroke | |
| 981. | 14 Discharge of centrifugal pump is |
| A. | directly proportional to diameter of its impeller |
| B. | inversely proportional to diameter of its impeller |
| C. | directly proportional to (diameter)2 of its impeller |
| D. | inversely proportional to (diameter)2 of its impeller |
| Answer» C. directly proportional to (diameter)2 of its impeller | |
| 982. | The ratio of quantity off liquid discharged per second from the pump to the quantity of liquid passing per second through the impeller is known as |
| A. | manometric efficiency |
| B. | mechanical efficiency |
| C. | overall efficiency |
| D. | volumetric efficiency |
| Answer» D. volumetric efficiency | |
| 983. | Multi-stage centrifugal pump are used to |
| A. | give high discharge |
| B. | produce high heads |
| C. | pump viscous fluids |
| D. | all of these |
| Answer» B. produce high heads | |
| 984. | The specific speed of a centrifugal pump, delivering 750 liters of water per second against a head of 15 meters at 725r.p.m., is |
| A. | 24.8r.p.m. |
| B. | 48.2r.p.m. |
| C. | 82.4r.p.m. |
| D. | 248r.p.m. |
| Answer» C. 82.4r.p.m. | |
| 985. | The specific speed from a centrifugal pump indicates that the pump is |
| A. | slow speed at radial flow at outlet |
| B. | medium speed with radial flow at outlet |
| C. | high speed with radial flow at outlet |
| D. | high speed with axial flow at outlet |
| Answer» D. high speed with axial flow at outlet | |
| 986. | Discharge of a centrifugal pump is (where N= speed of the pump impeller) |
| A. | directly proportional to n |
| B. | inversely proportional to n |
| C. | directly proportional to n2 |
| D. | inversely proportional to n2 |
| Answer» A. directly proportional to n | |
| 987. | For a centrifugal pump impeller, the maximum value of the vane exit angle is |
| A. | 10o to 15o |
| B. | 15o to 20o |
| C. | 20o to 25o |
| D. | 25o to 30o |
| Answer» C. 20o to 25o | |
| 988. | Pascal-second is the unit of |
| A. | pressure |
| B. | kinematic viscosity |
| C. | dynamic viscosity |
| D. | surface tension |
| Answer» C. dynamic viscosity | |
| 989. | An ideal fluid is |
| A. | one which obeys Newton’s law of viscosity |
| B. | frictionless and incompressible |
| C. | very viscous |
| D. | frictionless and compressible |
| Answer» B. frictionless and incompressible | |
| 990. | The unit of kinematic viscosity is |
| A. | gm/cm-sec2 |
| B. | dyne-sec/cm2 |
| C. | gm/cm2-sec |
| D. | cm2/sec |
| Answer» D. cm2/sec | |
| 991. | If the dynamic viscosity of a fluid is 0.5 poise and specific gravity is 0.5, then the kinematic viscosity of that fluid in stokes is |
| A. | 0.25 |
| B. | 0.50 |
| C. | 1.0 |
| D. | none of the above |
| Answer» C. 1.0 | |
| 992. | The viscosity of a gas |
| A. | decreases with increase in temperature |
| B. | increases with increase in temperature |
| C. | is independent of temperature |
| D. | is independent of pressure for very high pressure intensities |
| Answer» B. increases with increase in temperature | |
| 993. | Newton’s law of viscosity relates |
| A. | intensity of pressure and rate of angular deformation |
| B. | shear stress and rate of angular deformation |
| C. | shear stress, viscosity and temperature |
| D. | viscosity and rate of angular deformation |
| Answer» B. shear stress and rate of angular deformation | |
| 994. | An open tank contains 1 m deep water with 50 cm depth of oil of specific gravity 0.8 above it. The intensity of pressure at the bottom of tank will be |
| A. | 4 kN/m2 |
| B. | 10 kN/m2 |
| C. | 12 kN/m2 |
| D. | 14 kN/m2 |
| Answer» D. 14 kN/m2 | |
| 995. | The position of center of pressure on a plane surface immersed vertically in a static mass of fluid is |
| A. | at the centroid of the submerged area |
| B. | always above the centroid of the area |
| C. | always below the centroid of the area |
| D. | none of the above |
| Answer» C. always below the centroid of the area | |
| 996. | The total pressure on a plane surface inclined at an angle 9 with the horizontal is equal to (where p is pressure intensity at centroid of area and A is area of plane surface.) |
| A. | PA |
| B. | pA sin 9 |
| C. | pA cos 9 |
| D. | pA tan 9 |
| Answer» A. PA | |
| 997. | A vertical rectangular plane surface is submerged in water such that its top and bottom surfaces are 1.5 m and 6.0 m res-pectively below the free surface. The position of center of pressure below the free surface will be at a distance of |
| A. | 3.75 m |
| B. | 4.0 m |
| C. | 4.2m |
| D. | 4.5m |
| Answer» C. 4.2m | |
| 998. | Centre of buoyancy always |
| A. | coincides with the centre of gravity |
| B. | coincides with the centroid of the volume of fluid displaced |
| C. | remains above the centre of gravity |
| D. | remains below the centre of gravity |
| Answer» B. coincides with the centroid of the volume of fluid displaced | |
| 999. | If the weight of a body immersed in a fluid exceeds the buoyant force, then the body will |
| A. | rise until its weight equals the buoyant force |
| B. | tend to move downward and it may finally sink |
| C. | float |
| D. | none of the above |
| Answer» B. tend to move downward and it may finally sink | |
| 1000. | Metacentric height for small values of angle of heel is the distance between the |
| A. | centre of gravity and centre of buoy-ancy |
| B. | centre of gravity and metacentre |
| C. | centre of buoyancy and metacentre |
| D. | free surface and centre of buoyancy |
| Answer» B. centre of gravity and metacentre | |
| 1001. | A floating body is said to be in a state of stable equilibrium |
| A. | when its metacentric height is zero |
| B. | when the metacentre is above the centre of gravity |
| C. | when the metacentre is below the centre of gravity |
| D. | only when its centre of gravity is below its centre of buoyancy |
| Answer» B. when the metacentre is above the centre of gravity | |
| 1002. | The increase in meta centric height i) increases stability ii) decreases stability iii) increases comfort for passengers iv) decreases comfort for passengers The correct answer is |
| A. | (i) and (iii) |
| B. | (i)and(iv) |
| C. | (ii) and (iii) |
| D. | (ii) and (iv) |
| Answer» B. (i)and(iv) | |
| 1003. | A rectangular block 2 m long, 1 m wide and 1 m deep floats in water, the depth of immersion being 0.5 m. If water weighs 10 kN/m3, then the weight of the block is |
| A. | 5kN |
| B. | lOkN |
| C. | 15 kN |
| D. | 20 kN |
| Answer» B. lOkN | |
| 1004. | The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as |
| A. | center of gravity |
| B. | center of buoyancy |
| C. | center of pressure |
| D. | metacentre |
| Answer» C. center of pressure | |
| 1005. | If a vessel containing liquid moves downward with a constant acceleration equal to ‘g’ then |
| A. | the pressure throughout the liquid mass is atmospheric |
| B. | there will be vacuum in the liquid |
| C. | the pressure in the liquid mass is greater than hydrostatic pressure |
| D. | none of the above |
| Answer» A. the pressure throughout the liquid mass is atmospheric | |
| 1006. | When a liquid rotates at a constant angular velocity about a vertical axis as a rigid body, the pressure intensity varies |
| A. | linearly with radial distance |
| B. | as the square of the radial distance |
| C. | inversely as the square of the radial distance |
| D. | inversely as the radial distance |
| Answer» B. as the square of the radial distance | |
| 1007. | An open cubical tank of 2 m side is filled with water. If the tank is rotated with an acceleration such that half of the water spills out, then the acceleration is equal to |
| A. | g/3 |
| B. | g/2 |
| C. | 2g/3 |
| D. | g |
| Answer» D. g | |
| 1008. | A right circular cylinder open at the top is filled with liquid and rotated about its vertical axis at such a speed that half the liquid spills out, then the pressure intensity at the center of bottom is |
| A. | zero |
| B. | one-fourth its value when cylinder was full |
| C. | one-half its value when cylinder was full |
| D. | cannot be predicted from the given data |
| Answer» A. zero | |
| 1009. | The horizontal component of force on a curved surface is equal to the |
| A. | product of pressure intensity at its centroid and area |
| B. | force on a vertical projection of the curved surface |
| C. | weight of liquid vertically above the curved surface |
| D. | force on the horizontal projection of the curved surface |
| Answer» B. force on a vertical projection of the curved surface | |
| 1010. | A closed tank containing water is moving in a horizontal direction along a straight line at a constant speed. The tank also contains a steel ball and a bubble of air. If the tank is decelerated horizontally, then i) the ball will move to the front ii) the bubble will move to the front iii) the ball will move to the rear iv) the bubble will move to the rear Find out which of the above statements are correct ? |
| A. | (i) and (ii) |
| B. | (i)and(iv) |
| C. | (ii) and (iii) |
| D. | (iii) and (iv) |
| Answer» B. (i)and(iv) | |
| 1011. | The eddy viscosity for turbulent flow is |
| A. | a function of temperature only |
| B. | a physical property of the fluid. |
| C. | dependent on the flow |
| D. | independent of the flow |
| Answer» C. dependent on the flow | |
| 1012. | Flow at constant rate through a tapering pipe is i) steady flow ii) uniform flow iii) unsteady flow iv) non-uniform flow The correct answer is |
| A. | (i) and (ii) |
| B. | (i)and(iv) |
| C. | (ii) and (iii) |
| D. | (ii) and (iv) |
| Answer» B. (i)and(iv) | |
| 1013. | In a two dimensional incompressible steady flow around an airfoil, the stream lines are 2 cm apart at a great distance from the airfoil, where the velocity is 30 m/sec. The velocity near the airfoil, where the stream lines are 1.5 cm apart, is |
| A. | 22.5 m/sec. |
| B. | 33 m/sec. |
| C. | 40 m/sec. |
| D. | 90 m/sec. |
| Answer» C. 40 m/sec. | |
| 1014. | When the velocity distribution is uniform over the cross-section, the correction factor for momentum is |
| A. | 0 |
| B. | 1 |
| C. | 4/3 |
| D. | 2 |
| Answer» B. 1 | |
| 1015. | Least possible value of correction factor for i) kinetic energy is zero ii) kinetic energy is 1 iii) momentum is zero iv) momentum is 1 The correct statements are |
| A. | (i) and (iii) |
| B. | (ii) and (iii) |
| C. | (i) and (iv) |
| D. | (ii) and (iv) |
| Answer» D. (ii) and (iv) | |
| 1016. | If the velocity is zero over half of the cross-sectional area and is uniform over the remaining half, then the momentum correction factor is |
| A. | 1 |
| B. | 4/3 |
| C. | 2 |
| D. | 4 |
| Answer» C. 2 | |
| 1017. | If velocity is zero over l/3rd of a cross-section and is uniform over remaining 2/3rd of the cross-section, then the correction factor for kinetic energy is |
| A. | 4/3 |
| B. | 3/2 |
| C. | 9/4 |
| D. | 27/8 |
| Answer» C. 9/4 | |
| 1018. | The continuity equation pi V,A,= p2V2A2 is based on the following assumption regarding flow of fluid (where pi and p2 are mass densities.) |
| A. | steady flow |
| B. | uniform flow |
| C. | incompressible flow |
| D. | frictionless flow |
| Answer» A. steady flow | |
| 1019. | Which of the following velocity potentials satisfies continuity equation ? |
| A. | x2y |
| B. | x2-y2 |
| C. | cosx |
| D. | x2 + y2 |
| Answer» B. x2-y2 | |
| 1020. | The motion of air mass in a tornado is a |
| A. | free vortex motion |
| B. | forced vortex motion |
| C. | free vortex at center and forced vortex outside |
| D. | forced vortex at center and free vortex outside |
| Answer» D. forced vortex at center and free vortex outside | |
| 1021. | In a forced vortex motion, the velocity of flow is |
| A. | directly proportional to its radial distance from axis of rotation |
| B. | inversely proportional to its radial distance from the axis of rotation |
| C. | inversely proportional to the square of its radial distance from the axis of rotation |
| D. | directly proportional to the square of its radial distance from the axis of rotation |
| Answer» A. directly proportional to its radial distance from axis of rotation | |
| 1022. | Stream lines and path lines always coincide in case of |
| A. | steady flow |
| B. | laminar flow |
| C. | uniform flow |
| D. | turbulent flow |
| Answer» A. steady flow | |
| 1023. | Equation of continuity is based on the principle of conservation of |
| A. | mass |
| B. | energy |
| C. | momentum |
| D. | none of the above |
| Answer» A. mass | |
| 1024. | In steady flow of a fluid, the total accele ration of any fluid particle |
| A. | can be zero |
| B. | is never zero |
| C. | is always zero |
| D. | is independent of coordinates |
| Answer» A. can be zero | |
| 1025. | The pitot tube is used to measure |
| A. | velocity at stagnation point |
| B. | stagnation pressure |
| C. | static pressure |
| D. | dynamic pressure |
| Answer» B. stagnation pressure | |
| 1026. | Hot wire anemometer is used to measure |
| A. | discharge |
| B. | velocity of gas |
| C. | pressure intensity of gas |
| D. | pressure intensity of liquid |
| Answer» B. velocity of gas | |
| 1027. | The theoretical value of coefficient of contraction of a sharp edged orifice is |
| A. | 0.611 |
| B. | 0.85 |
| C. | 0.98 |
| D. | 1.00 |
| Answer» A. 0.611 | |
| 1028. | Which of the following is used to measure the discharge ? |
| A. | current meter |
| B. | venturimeter |
| C. | pitot tube |
| D. | hotwire anemometer |
| Answer» B. venturimeter | |
| 1029. | Select the incorrect statement. |
| A. | The pressure intensity at vena contracta is atmospheric. |
| B. | Contraction is least at vena contracta. |
| C. | Stream lines are parallel throughout the jet at vena contracta. |
| D. | Coefficient of contraction is always less than one. |
| Answer» C. Stream lines are parallel throughout the jet at vena contracta. | |
| 1030. | Size of a venturimeter is specified by |
| A. | pipe diameter |
| B. | throat diameter |
| C. | angle of diverging section |
| D. | both pipe diameter as well as throat diameter |
| Answer» A. pipe diameter | |
| 1031. | Due to each end contraction, the discharge of rectangular sharp crested weir is reduced by |
| A. | 5% |
| B. | 10% |
| C. | 15% |
| D. | 20% |
| Answer» A. 5% | |
| 1032. | The discharge through a V- notch varies as |
| A. | H1/2 |
| B. | H3’2 |
| C. | H5/2 |
| D. | H5’4 where H is head. |
| Answer» C. H5/2 | |
| 1033. | Which of the following is an incorrect statement ? |
| A. | Coefficient of contraction of a venturimeter is unity. |
| B. | Flow nozzle is cheaper than venturimeter but has higher energy loss. |
| C. | Discharge is independent of orientation of venturimeter whether it is horizontal, vertical or inclined. |
| D. | None of the above statement is correct. |
| Answer» D. None of the above statement is correct. | |
| 1034. | Coefficient of velocity of venturimeter |
| A. | is independent of Reynolds number |
| B. | decreases with higher Reynolds number |
| C. | is equal to the coefficient of discharge of venturimeter |
| D. | none of the above |
| Answer» C. is equal to the coefficient of discharge of venturimeter | |
| 1035. | The pressure at the summit of a syphon is |
| A. | equal to atmospheric |
| B. | less than atmospheric |
| C. | more than atmospheric |
| D. | none of the above |
| Answer» B. less than atmospheric | |
| 1036. | Ay between two stream lines represents |
| A. | velocity |
| B. | discharge |
| C. | head |
| D. | pressure |
| Answer» B. discharge | |
| 1037. | Coefficient of velocity for Borda’s mouth piece running full is |
| A. | 0.611 |
| B. | 0.707 |
| C. | 0.855 |
| D. | 1.00 |
| Answer» B. 0.707 | |
| 1038. | Coefficient of discharge for a totally submerged orifice as compared to that for an orifice discharging free is |
| A. | slightly less |
| B. | slightly more |
| C. | nearly half |
| D. | equal |
| Answer» A. slightly less | |
| 1039. | The major loss of energy in long pipes is due to |
| A. | sudden enlargement |
| B. | sudden contraction |
| C. | gradual contraction or enlargement |
| D. | friction |
| Answer» D. friction | |
| 1040. | Coefficient of contraction for an external cylindrical mouthpiece is |
| A. | 1.00 |
| B. | 0.855 |
| C. | 0.7H |
| D. | 0.611 |
| Answer» A. 1.00 | |
| 1041. | Which of the following has highest coefficient of discharge ? |
| A. | sharp edged orifice |
| B. | venturimeter |
| C. | Borda’s mouthpiece running full |
| D. | CipoUetti weir |
| Answer» B. venturimeter | |
| 1042. | In a Sutro weir, the discharge is proportional to (where H is head.) |
| A. | H1/2 |
| B. | H3/2 |
| C. | H5/2 |
| D. | H |
| Answer» D. H | |
| 1043. | The discharge over a broad crested weir is maximum when the depth of (where H is the available head.) flow is |
| A. | H/3 |
| B. | H/2 |
| C. | 2 H/5 |
| D. | 2 H/3 |
| Answer» D. 2 H/3 | |
| 1044. | Which of the following statements is correct? |
| A. | Lower critical Reynolds number is of no practical significance in pipe flow problems. |
| B. | Upper critical Reynolds number is significant in pipe flow problems. |
| C. | Lower critical Reynolds number has the value 2000 in pipe flow |
| D. | Upper critical Reynolds number is the number at which turbulent flow changes to laminar flow. |
| Answer» A. Lower critical Reynolds number is of no practical significance in pipe flow problems. | |
| 1045. | For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be |
| A. | 300 |
| B. | 337.5 |
| C. | 600 |
| D. | 675 |
| Answer» D. 675 | |
| 1046. | The shear stress distribution for a fluid flowing in between the parallel plates, both at rest, is |
| A. | constant over the cross section |
| B. | parabolic distribution across the section |
| C. | zero at the mid plane and varies linearly with distance from mid plane |
| D. | zero at plates and increases linearly to midpoint |
| Answer» C. zero at the mid plane and varies linearly with distance from mid plane | |
| 1047. | If x is the distance from leading edge, then the boundary layer thickness in laminar flow varies as |
| A. | x |
| B. | x |
| C. | x |
| D. | x/7 |
| Answer» A. x | |
| 1048. | Stanton diagram is a |
| A. | log-log plot of friction factor against Reynolds number |
| B. | log-log plot of relative roughness against Reynolds number |
| C. | semi-log plot of friction factor against Reynolds number |
| D. | semi-log plot of friction factor against relative roughness |
| Answer» A. log-log plot of friction factor against Reynolds number | |
| 1049. | The depth ‘d’ below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be (where D is the depth of flow.) |
| A. | 0.423 D |
| B. | 0.577 D |
| C. | 0.223 D |
| D. | 0.707 D |
| Answer» B. 0.577 D | |
| 1050. | The boundary layer thickness in turbulent flow varies as (where x is the distance from leading edge.) |
| A. | x”7 |
| B. | x,/2 |
| C. | x4/5 |
| D. | x3/5 |
| Answer» C. x4/5 | |
| 1051. | The distance y from pipe boundary, at which the point velocity is equal to average velocity for turbulent flow, is (where R is radius of pipe.) |
| A. | 0.223 R |
| B. | 0.423 R |
| C. | 0.577 R |
| D. | 0.707 R |
| Answer» A. 0.223 R | |
| 1052. | If a sphere of diameter 1 cm falls in castor oil of kinematic viscosity 10 stokes, with a terminal velocity of 1.5 cm/sec, the coefficient of drag on the sphere is |
| A. | less than 1 |
| B. | between 1 and 100 |
| C. | 160 |
| D. | 200 |
| Answer» C. 160 | |
| 1053. | In case of an airfoil, the separation of flow occurs |
| A. | at the extreme rear of body |
| B. | at the extreme front of body |
| C. | midway between rear and front of body |
| D. | any where between rear and front of body depending upon Reynolds number |
| Answer» A. at the extreme rear of body | |
| 1054. | When an ideal fluid flows past a sphere, |
| A. | highest intensity of pressure occurs around the circumference at right angles to flow |
| B. | lowest pressure intensity occurs at front stagnation point |
| C. | lowest pressure intensity occurs at rear stagnation point |
| D. | total drag is zero |
| Answer» D. total drag is zero | |
| 1055. | With the same cross-sectional area and immersed in same turbulent flow, the largest total drag will be on |
| A. | a circular disc of plate held normal to flow |
| B. | a sphere |
| C. | a cylinder |
| D. | a streamlined body |
| Answer» A. a circular disc of plate held normal to flow | |
| 1056. | In which of the following the friction drag is generally larger than pressure drag? |
| A. | a circular disc or plate held normal to flow |
| B. | a sphere |
| C. | a cylinder |
| D. | an airfoil |
| Answer» D. an airfoil | |
| 1057. | For hydro-dynamically smooth boundary, the friction coefficient for turbulent flow is |
| A. | constant |
| B. | dependent only on Reynolds number |
| C. | a function of Reynolds number and relative roughness |
| D. | dependent on relative roughness only |
| Answer» B. dependent only on Reynolds number | |
| 1058. | The value of friction factor ‘f’ for smooth pipes for Reynolds number 106 is approximately equal to |
| A. | 0.1 |
| B. | 0.01 |
| C. | 0.001 |
| D. | 0.0001 |
| Answer» B. 0.01 | |
| 1059. | For laminar flow in a pipe of circular cross-section, the Darcy’s friction factor f is |
| A. | directly proportional to Reynolds number and independent of pipe wall roughness |
| B. | directly proportional to pipe wall roughness and independent of Reynolds number |
| C. | inversely proportional to Reynolds number and indpendent of pipe wall roughness |
| D. | inversely proportional to Reynolds number and directly proportional to pipe wall roughness |
| Answer» C. inversely proportional to Reynolds number and indpendent of pipe wall roughness | |
| 1060. | Separation of flow occurs when |
| A. | the pressure intensity reaches a minimum |
| B. | the cross-section of a channel is reduced |
| C. | the boundary layer comes to rest |
| D. | all of the above |
| Answer» C. the boundary layer comes to rest | |
| 1061. | The ratio of average velocity to maximum velocity for steady laminar flow in circular pipes is |
| A. | 1/2 |
| B. | 2/3 |
| C. | 3/2 |
| D. | 2 |
| Answer» A. 1/2 | |
| 1062. | The distance from pipe boundary, at which the turbulent shear stress is one-third die wall shear stress, is (where R is the radius of pipe.) |
| A. | 1/3 R |
| B. | 1/2 R |
| C. | 2/3 R |
| D. | 3/4R |
| Answer» A. 1/3 R | |
| 1063. | The discharge of a liquid of kinematic viscosity 4 cm2/sec through a 8 cm dia-meter pipe is 3200n cm7sec. The type of flow expected is |
| A. | laminar flow |
| B. | transition flow |
| C. | turbulent flow |
| D. | not predictable from the given data |
| Answer» A. laminar flow | |
| 1064. | The Prartdtl mixing length is |
| A. | zero at the pipe wall |
| B. | maximum at the pipe wall |
| C. | independent of shear stress |
| D. | none of the above |
| Answer» A. zero at the pipe wall | |
| 1065. | The velocity distribution for laminar flow through a circular tube |
| A. | is constant over the cross-section |
| B. | varies linearly from zero at walls to maximum at centre |
| C. | varies parabolically with maximum at the centre |
| D. | none of the above |
| Answer» C. varies parabolically with maximum at the centre | |
| 1066. | A fluid of kinematic viscosity 0.4 cm2/sec flows through a 8 cm diameter pipe. The maximum velocity for laminar flow will be |
| A. | less than 1 m/sec |
| B. | 1 m/sec |
| C. | 1.5 m/sec |
| D. | 2 m/sec |
| Answer» B. 1 m/sec | |
| 1067. | The losses are more in |
| A. | laminar flow |
| B. | transition flow |
| C. | turbulent flow |
| D. | critical flow |
| Answer» C. turbulent flow | |
| 1068. | The wake |
| A. | always occurs before a separation point |
| B. | always occurs after a separation point |
| C. | is a region of high pressure intensity |
| D. | none of the above |
| Answer» B. always occurs after a separation point | |
| 1069. | The maximum thickness of boundary layer in a pipe of radius r is |
| A. | 0 |
| B. | r/2 |
| C. | r |
| D. | 2r |
| Answer» C. r | |
| 1070. | The hydraulic grade line is |
| A. | always above the centre line of pipe |
| B. | never above the energy grade line |
| C. | always sloping downward in the direction of flow |
| D. | all of the above |
| Answer» B. never above the energy grade line | |
| 1071. | Two pipe systems are said to be equivalent when |
| A. | head loss and discharge are same in two systems |
| B. | length of pipe and discharge are same in two systems |
| C. | friction factor and length are same in two systems |
| D. | length and diameter are same in two systems |
| Answer» A. head loss and discharge are same in two systems | |
| 1072. | In series-pipe problems |
| A. | the head loss is same through each pipe |
| B. | the discharge is same through each pipe |
| C. | a trial solution is not necessary |
| D. | the discharge through each pipe is added to obtain total discharge |
| Answer» B. the discharge is same through each pipe | |
| 1073. | Select the correct statement. |
| A. | The absolute roughness of a pipe de-creases with time. |
| B. | A pipe becomes smooth after using for long time. |
| C. | The friction factor decreases with time. |
| D. | The absolute roughness increases with time. |
| Answer» D. The absolute roughness increases with time. | |
| 1074. | A valve is suddenly closed in a water main in wl.ich the velocity is 1 m/sec and velocity of pressure wave is 981 m/ sec. The inertia head at the valve will be |
| A. | 1 m |
| B. | 10m |
| C. | 100m |
| D. | none of the above |
| Answer» C. 100m | |
| 1075. | The speed of a pressure wave through a pipe depends upon |
| A. | the length of pipe |
| B. | the viscosity of fluid |
| C. | the bulk modulus for the fluid |
| D. | the original head |
| Answer» C. the bulk modulus for the fluid | |
| 1076. | When time of closure tc = L/v0 (where L is length of pipe and v0 is speed of pressure wave), the portion of pipe length subjected to maximum head is |
| A. | L/4 |
| B. | L/3 |
| C. | L/2 |
| D. | L |
| Answer» A. L/4 | |
| 1077. | If the elevation of hydraulic grade line at the junction of three pipes is above the elevation of reservoirs B and C and below reservoir A, then the direction of flow will be |
| A. | from reservoir A to reservoirs B and C |
| B. | from reservoir B to reservoirs C and A |
| C. | from reservoir C to reservoirs A and B |
| D. | unpredictable |
| Answer» C. from reservoir C to reservoirs A and B | |
| 1078. | The length of a pipe is 1 km and its diameter is 20 cm. If the diameter of an equivalent pipe is 40 cm, then its length is |
| A. | 32 km |
| B. | 20 km |
| C. | 8 km |
| D. | 4 km |
| Answer» A. 32 km | |
| 1079. | Two pipes of same length and diameters d and 2d respectively are connected in series. The diameter of an equivalent pipe of same length is |
| A. | less than d |
| B. | between d and 1.5 d |
| C. | between 1.5 d and 2d |
| D. | greater than 2d |
| Answer» A. less than d | |
| 1080. | The horse power transmitted through a pipe is maximum when the ratio of loss of head due to friction and total head supplied is |
| A. | 1/3 |
| B. | 1/4 |
| C. | 1/2 |
| D. | 2/3 |
| Answer» A. 1/3 | |
| 1081. | The boundary layer thickness at a distance of l m from the leading edge of a flat plate, kept at zero angle of incidence to the flow direction, is O.l cm. The velocity outside the boundary layer is 25 ml sec. The boundary layer thickness at a distance of 4 m is (Assume that boundary layer is entirely laminar.) |
| A. | 0.40 cm |
| B. | 0.20 cm |
| C. | 0.10 cm |
| D. | 0.05 cm |
| Answer» B. 0.20 cm | |
| 1082. | Drag force is a function of i) projected area of the body ii) mass density of the fluid iii) velocity of the body The correct answer is |
| A. | (i) and (ii) |
| B. | (i) and (iii) |
| C. | (ii) and (iii) |
| D. | (i), (ii) and (iii) |
| Answer» D. (i), (ii) and (iii) | |
| 1083. | The correct relationship among displacement thickness d, momentum thickness m and energy thickness e is |
| A. | d > m > e |
| B. | d > e > m |
| C. | e > m > d |
| D. | e > d > m |
| Answer» D. e > d > m | |
| 1084. | For laminar flow in circular pipes, the Darcy’s friction factor f is equal to |
| A. | 16/Re |
| B. | 32/ Re |
| C. | 64/ Re |
| D. | none of the above where R,, is Reynolds number. |
| Answer» C. 64/ Re | |
| 1085. | Surge wave in a rectangular channel is an example of i) steady flow ii) unsteady flow iii) uniform flow iv) non-uniform flow The correct answer is |
| A. | (i) and (iii) |
| B. | (ii) and (iii) |
| C. | (i) and (:v) |
| D. | (ii) and (iv) |
| Answer» D. (ii) and (iv) | |
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