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Home/ Automobile mcq/Automobile Engineering Solved MCQs

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On: July 6, 2023 Posted in Automobile mcq Comments: 0 Views: 25

Automobile Engineering Solved MCQs

1.Starting motor current may be around
A.0.1 A
B.25 A
C.1. A
D.0.5 A
E.35 A
Answer» B. 25 A

2.The purpose of the dynamo in an automobile is to
A.Act as a reservoir of electrical energy
B.Continually recharge the battery
C.Convert mechanical energy into electrical energy
D.Partly convert engine power into electric power
E.Supply electric power
Answer» B. Continually recharge the battery

3.In a vehicle if there is no king pin offset
A.Starting steering effort will be high
B.Starting steering effort will be zero
C.Wobbling of wheels will increase
D.bracking effort will be high
E.None of the above
Answer» A. Starting steering effort will be high

4.In a four stroke engine, for the combustion of one litre of fuel, the volume of air required would be approximately
A.1 cu-m
B.5 – 7 cu-m
C.15 – 16 cu-m
D.2 cu-m
E.9 – 10 cu-m
Answer» E. 9 – 10 cu-m

5.The number of revolutions per km for a free rolling tyre are less than that calculated from its static radius. This difference in number of revolutions is due to
A.forces in the contact area that cause slight forward of the tread
B.hysteresis of the tyre materials which make the dynamic loaded radius somewhat larger than the static radius
C.either of (A) and (B) above
D.none of the above
E.None of the above
Answer» C. either of (A) and (B) above

6.The reaction time of an average driver from recognizing an obstacle is taken as
A.0.5 to 1.7 seconds
B.4.5 to 7.0 seconds
C.3.5 to 4.5 seconds
D.7 to 10 seconds
E.2 to 3.5 seconds
Answer» A. 0.5 to 1.7 seconds

7.The fuel is injected into the cylinder in Diesel engine when the piston is
A.Pump the fuel to the injector
B.Approaching T.D.C. during compression stroke
C.Just after T.D.C. during exhaust compression stroke
D.Exactly at T.D.C. after compression stroke
E.Approaching T.D.C. during exhaust stroke
Answer» B. Approaching T.D.C. during compression stroke

8.Dilution of lubricating oil is caused by
A.Solid contaminants like dust, etc.
B.Solid combustion residues
C.Worn off particles
D.Water
E.Fuels
Answer» E. Fuels

9.The function of oil scraper rings is to
A.Lubricate cylinder walls
B.Retain compression
C.Maintain vacuum
D.Reduce vacuum
E.Reduce piston wear
Answer» A. Lubricate cylinder walls

10.Speedometer drive is usually taken from
A.Gear box
B.Dynamo
C.Fan belt
D.Front wheel
E.Flywheel
Answer» D. Front wheel

11.The gear ratio in the differential unit of a passenger car is of the order of
A.3 ; 1
B.6 ; 1
C.2 ; 1
D.8 ; 1
E.10 ; 1
Answer» A. 3 ; 1

12.Exhaust gas leakage into the cooling system is most likely to be due to a defective
A.Cylinder head gasket
B.Manifold gasket
C.Water pump
D.Radiator
E.Any of the above
Answer» A. Cylinder head gasket

13.The frame provided for supporting the units of chasis and the body, in case of Tata vehicles is
A.Cross member – type frame
B.Centre beam frame
C.Y-shaped tube frame
D.Self-supporting structure
E.Any of the above
Answer» A. Cross member – type frame

14.Which one of the following is not a part of the hydraulic braking system?
A.Wheel cylinder
B.Steering mechanism
C.Brade shope
D.Master cylinder
E.Brake pedal
Answer» B. Steering mechanism

15.The process of super charging is meant for
A.raising exhaust pressure
B.increasing density of intake air
C.providing air for cooling
D.none of the above
E.An instrument for smoke analysis
Answer» B. increasing density of intake air

16.Diesel fuel as compared to petrol is
A.More difficult to ignite
B.Less difficult to ignite
C.Equally difficult to ignite
D.None of the above
E.Compression ratio
Answer» A. More difficult to ignite

17.A ring gear is provided around the engine fly-wheel
A.For getting uniform speed
B.To start the engine using self-starter
C.For reducing noise
D.To get variable engine speeds
E.To operate the valves
Answer» B. To start the engine using self-starter

18.The part of the vehicle which holds the passengers and the cargo to be transported, is known as
A.Senan
B.Chassis
C.Hull
D.Cabin
E.Aft
Answer» C. Hull

19.Wax is applied on car body because
A.It is water repellent
B.It seals off the pores
C.The surface shines
D.Any of the above
E.None of the above
Answer» D. Any of the above

20.Synthetic rubber is made of
A.Coal
B.Butadiene
C.Mineral oil
D.Crude oil
E.Starch
Answer» B. Butadiene

 (1)

21.Fuel pump for diesel engine is
A.electrically operated
B.mechanically operated
C.pneumatically operated
D.electro-magnetically operated
E.None of the above
Answer» B. mechanically operated

22.The process of supplying the intake air to the engine cylinder at a pressure greater than the pressure of the surrounding atmosphere is known as
A.supercharging
B.auto-ignition
C.scavenging
D.none of the above
E.None of the above
Answer» A. supercharging

23.Highest useful compression ratio is an indicator of
A.knocking of a fuel at a particular pressure
B.knocking of a fuel at a particular temperature
C.knocking of a fuel in a particular engine
D.knocking of a fuel under specified conditions in a standard engine
E.None of the above
Answer» D. knocking of a fuel under specified conditions in a standard engine

24.Which one of the following is antifriction bearing?
A.Ball bearing
B.Roller bearing
C.Taper roller bearing
D.Needle bearing
E.All of the above
Answer» A. Ball bearing

26.Which of the following lamp in a car will have the least wattage
A.Flasher bulb
B.Head light bulb
C.Stop light bulb
D.Ignition warning light
E.Parking light bulb
Answer» D. Ignition warning light

27.The boiling point of Diesel fuel may be expected to be in the range
A.150 °C to 200 °C
B.70 °C to 100 °C
C.125 °C to 135 °C
D.220 °C to 375 °C
E.100 °C to 112 °C
Answer» D. 220 °C to 375 °C

28.Odometer is
A.An instrument which indicates the condition of the battery
B.An instrument for distance measurement
C.An instrument for BHP measurement
D.An instrument for smoke analysis
E.An instrument used for measurement of fuel consumption
Answer» B. An instrument for distance measurement

29.For lubrication of which part of an automobile only grease is used
A.Transmission
B.Steering system
C.Axle drive
D.Tie rod
E.All of the above
Answer» D. Tie rod

30.In case of four cylinder in line engine, the number of firing stroke (s) in one revolution of crank is
A.3
B.4
C.2
D.Depends on the design of engine.
E.1
Answer» C. 2

31.Diesel engines are also known as
A.S.I. engines
B.C.I. engines
C.Steam engines
D.none of the above
E.None of the above
Answer» B. C.I. engines

32.High sulphur content of petrol affects the engine performance by
A.causing corrosion of muffler and exhaust pipe
B.had odours
C.poor explosion characteristics
D.All of the above
E.None of the above
Answer» D. All of the above

33.Which part is not common between the petrol and diesel engines
A.Battery
B.Dynamo
C.Air cleaner
D.Fuel injector
E.Exhaust silencer
Answer» D. Fuel injector

34.The problem of exhaust emissions can be handled by
A.engine design modification
B.treatment of exhaust gases
C.fuel modification
D.All of the above
E.None of the above
Answer» D. All of the above

35.The heating value of petrol is
A.7650 kcal/kg
B.10,000-10400 kcal/kg
C.15000-16000 kcal/kg
D.8000-8500 kcal/kg
E.12750-13850 kcal/kg
Answer» B. 10,000-10400 kcal/kg

 (1)

36.The king pin inclination is usually
A.Less than
B.Between 2? and 5?
C.More than 7?
D.More than 7?
E.Between 1? to 2?
Answer» B. Between 2? and 5?

37.Which of the following can be used for starting a 1000 H.P. diesel engine?
A.Battery
B.Shunt motor
C.Small petrol engine
D.Compressed air
E.Any of the above
Answer» D. Compressed air

38.In a scooter engine the cylinder is lubricated by
A.Cylinder does not require lubrication
B.Lubrication plug
C.Pressure lubrication
D.Splash lubrication
E.Mixing lubricating oil in the fuel
Answer» E. Mixing lubricating oil in the fuel

39.Which one of the following is independent of fuel constituents, combustion chamber design, temperature and pressure of compressed charge
A.Pinking
B.Pre-ignition
C.Knocking
D.none of the above
E.None of the above
Answer» B. Pre-ignition

40.Engine pistons are generally made of aluminium alloy because
A.It has less wear
B.It is stronger
C.It absorbs shocks
D.It does not react with fuel as well as lubricating oil
E.It is lighter
Answer» E. It is lighter

41.Springs are made of
A.Carbon steel
B.Stainless steel
C.High speed steel
D.Mild steel
E.Spring steel
Answer» E. Spring steel

42.The breaking up of a liquid into fine droplets by spraying is called
A.Injection
B.Vaporization
C.Atomisation
D.Ionisation
E.Carburetion
Answer» C. Atomisation

43.Which fuel has maximum resistance to detonation
A.n-heptane
B.Toluene
C.Isoctave
D.Benzene
E.Alcohol
Answer» C. Isoctave

44.A square type engine
A.Has operating speed as 64, 81, 100, 121, 144, 169, 196 rpm or the like
B.Has cylinder bore equal to stroke length
C.Has four cylinders with phase shift of 90? between any two consecutive cylinders
D.Has two cylinders horizontal and two cylinders vertical
E.Has geometrical shape as square
Answer» B. Has cylinder bore equal to stroke length

45.For balancing single cylinder engine a counter weight is added to
A.Crankshaft
B.Piston rings
C.Piston
D.Gudgeon pin
E.Connecting rod
Answer» A. Crankshaft

46.In an engine shows lack of power on running the probable cause could be
A.Poor compression
B.Faulty ignition
C.Overheating
D.Over cooling
E.Any of the above
Answer» E. Any of the above

 (1)

47.If the end mixture of S.I. engine is having low temperature and long igition delay, then knocking will
A.accelerate
B.decrease
C.remain constant
D.none of the above
E.None of the above
Answer» B. decrease

48.The maximum pressure generated by the fuel injection pump does not reach the nozzle end immediately. The lag is due to
A.friction in the oil column
B.pressure wave in the oil column
C.turbulence in the cylinder
D.none of the above
E.None of the above
Answer» B. pressure wave in the oil column

49.Which company is not engaged in the manufacture of tyres in India
A.Larsen & Toubro
B.Appollo
C.Modi
D.Good year
E.J.K.
Answer» B. Appollo

51.The size of the engine intake valve is
A.Same as that of exhaust valve
B.Depends upon the temperature of ambient air.
C.Does not depends upon the size of the exhaust valve
D.Smaller than that of exhaust valve
E.Large than that of exhaust valve
Answer» D. Smaller than that of exhaust valve

52.To avoid chances of maisalignment the bearing generally used is
A.Double row ball bearing
B.Axial bearing
C.Self-aligning bearing
D.Taper roller bearing
E.Radial bearing
Answer» D. Taper roller bearing

53.In the cam the distance between the base circle and the nose is called
A.Displacement
B.Lift
C.Flank
D.Lobe
E.Nose
Answer» B. Lift

54.Which one of the following does not form a part of the fuel supply system for a Diesel engine?
A.Injector
B.Filter
C.Spray nozzles
D.Supply pump
E.Air cleaner
Answer» E. Air cleaner

55.In case of four cylinder opposed cylinder engines, the firing order is
A.1-2-4-3
B.1-2-3-4
C.1-4-3-2
D.1-2-4-2
E.1-3-2-4
Answer» C. 1-4-3-2

56.Magneto ignition system is used in
A.S.I. engines
B.C.I. engines
C.Steam engines
D.none of the above
E.None of the above
Answer» A. S.I. engines

57.Cross wire grooves on tyres
A.Absorb shocks due to road unevenness
B.Lessen the danger of skidding
C.Provide good traction
D.Provide better load carrying capacity
E.Secure better steering properties
Answer» A. Absorb shocks due to road unevenness

58.Automobiles in India generally do not use battery with a voltage of
A.6 volts
B.12 volts
C.18 volts
D.24 volts
E.Any of the above
Answer» C. 18 volts

59.Loss of engine compression can result from
A.Defective fan delt
B.Loose valve and tapper clearance
C.Poor lubrication
D.Worn rings or cylinder wall
E.Any of the above
Answer» D. Worn rings or cylinder wall

60.Which vechicle is generally provided with four wheel drive
A.Standard wagon
B.Ambassador car
C.Jeep
D.Padmini car
E.Metador
Answer» C. Jeep

61.Which air cleaner is considered to be most effective in Diesel engines?
A.All are equally effective
B.Whirl type
C.Oil bath type
D.Wet type
E.Dry type
Answer» C. Oil bath type

62.The starter motor is driven by
A.V-belt drive
B.P.I.V drive
C.Chain drive
D.Flat belt drive
E.Gear drive
Answer» E. Gear drive

63.Which region of an automobile tyre is subjected to greatest flexing action?
A.Bead
B.Side wall
C.Shoulder
D.Tread
E.None of the above
Answer» B. Side wall

64.The time before actual fuel injection and pump olunger starts to pump fuel, is known as
A.injection lag
B.overlap
C.ignition lag
D.none of the above
E.None of the above
Answer» A. injection lag

65.The inlet value of a four stroke I.C. engine, in actual practice, should close
A.exactly at the end of suction stroke
B.slightly after the end of suction stroke
C.slightly before the end of suction stroke
D.none of the above
E.None of the above
Answer» B. slightly after the end of suction stroke

66.Ignition system used in scooters is
A.magneto system
B.battery system
C.Combination of magneto and battery system
D.neither magneto nor battery system
E.None of the above
Answer» A. magneto system

67.In a petrol engine, the gas which does not burn and passes out without transformation is
A.Oxygen
B.Carbondioxide
C.Nitrogen
D.Carbon monoxide
E.Water vapour
Answer» C. Nitrogen

68.In case of clutch if the springs become weak, the remedy lies in
A.Tightening further the springs
B.Interchanging the springs
C.Retempering the springs
D.Replacing the springs
E.Any of the above
Answer» D. Replacing the springs

69.If the water level in engine is maintained low, the likely consequence could be
A.Piston seizure
B.Engine knocking
C.Bearing deterioration
D.All of the above
E.None of the above
Answer» D. All of the above

70.At the first sight a petrol engine is identified by
A.Size of air cleaner
B.Cylinder size
C.Spark plug
D.Power output
E.Operating speed
Answer» C. Spark plug

71.Aluminium cylinder blocks require
A.No lines
B.Brass liners
C.Stainless steel liners
D.Cast iron liners
E.Aluminium liners
Answer» D. Cast iron liners

72.1000 mm diameter tyre is generally used on
A.Scooters
B.Jeeps
C.Motorcycles
D.Trucks
E.Mopads
Answer» D. Trucks

73.Engine starter motor is
A.D.C. compound motor
B.D.C. series motor
C.Synchronous motor
D.Single phase A.C. motor
E.D.C. shunt motor
Answer» B. D.C. series motor

74.Which one of the followings is used in C.I. engines?
A.spark plug
B.injector
C.cross-head
D.none of the above
E.None of the above
Answer» B. injector

75.Failure of an engine to start even though it turns over at normal cranking speed could be due to
A.A defective cranking motor
B.Defective ignition
C.Run down battery
D.Sticking valve
E.Low ambient temperature
Answer» B. Defective ignition

76.The substance which when added in a small proportion into petrol reduces knocking is
A.iso-butane
B.n-heptane
C.methyl nepthalene
D.tetra ethyl lead
E.None of the above
Answer» D. tetra ethyl lead

77.In a diesel engine the pipe carrying fuel from fuel pump to nozzle is made of
A.Plastic
B.Aluminium
C.P.V.C.
D.Steel
E.Copper
Answer» D. Steel

78.The percentage of heat released from fuel air mixutre, in an internal combustion engine which is converted into useful work is roughly
A.60 – 64 percent
B.20 – 25 percent
C.35 – 45 percent
D.10 percent
E.15 – 20 percent
Answer» B. 20 – 25 percent

79.The knocking C.I engines is characterised by the sudden auto-ignition of the mixture
A.at the end of the combustion process
B.in the middle of combustion process
C.at the very beginning of the combustion process
D.none of the above
E.None of the above
Answer» C. at the very beginning of the combustion process

80.The braking system provided on trains is
A.Pneumatic
B.Vaccum
C.Hydraulic
D.Mechanical
E.Air assisted hydraulic
Answer» B. Vaccum

81.The need for installing new piston rings is determined by checking
A.The gap between the ends of the ring
B.The clearance between cylinder and piston rings
C.The clearance between piston and piston rings
D.The clearance between cylinder and piston
E.The surface of the piston ring
Answer» B. The clearance between cylinder and piston rings

82.In a Diesel engine, during combustion the pressure may increase at a range of
A.55-75 atm
B.10-15 atm
C.20-30 atm
D.15-20 atm
E.Depends on engine size and speed
Answer» A. 55-75 atm

83.A smoky blue exhaust is due to
A.Burning of oil in combustion chamber
B.Incorrect valve adjustment
C.Excessive air
D.Incorrect tappet adjustment
E.Excessive rich mixture
Answer» A. Burning of oil in combustion chamber

84.Differential gear box oil is usually renewed after
A.1000 km
B.2500 – 6000 km
C.10000 – 20000 km
D.2500 km
E.6000 km
Answer» B. 2500 – 6000 km

85.The tendency of a petrol engine to knock increases by
A.Turbo-charging
B.Cataytic converter
C.Alcohol
D.Addition of lead
E.Super-charging
Answer» A. Turbo-charging

86.In S.I. engine if the spark plug deposit indicates black coating of soot, it therefore indicates that the engine has been generally operating on
A.Too rich mixture
B.Most economical mixture
C.Too lean mixture
D.Slightly rich mixture
E.Stoichiometric mixture
Answer» A. Too rich mixture

87.Ignition quality of petrol is expressed by
A.Calorific value
B.Octane no
C.Cetane no
D.Mass/volume ratio
E.Alcohol
Answer» B. Octane no

88.Petrol engines are also known as
A.S.I. Engines
B.C.I. Engines
C.Steam Engines
D.none of the above
E.None of the above
Answer» A. S.I. Engines

89.The air gap between the central electrode and ground electrode of a spark plug is approximately
A.1 cm
B.0.5 cm
C.0.2 cm
D.0.1 cm to 0.06 cm
E.None of the above
Answer» D. 0.1 cm to 0.06 cm

90.In commercial vehicle layouts engine is located forward, rear or under floor mainly to
A.Minimize the tendency to over turn
B.Reduce the weight of chassis
C.Increase fuel economy
D.Better utilise the space
E.Have better weight distribution
Answer» E. Have better weight distribution

91.When considerable material must be removed to clean up a cylinder bore, the cylinder should be
A.Glazed
B.Ground
C.Honed
D.Reamed
E.Bored
Answer» D. Reamed

 (1)

92.Wheel base of a vehicle is the
A.Distance between the front tyres
B.Distance between front and rear axles
C.Extreme length of the vehicle
D.The combined width of rear tyres
E.Width of tyres
Answer» B. Distance between front and rear axles

93.In a vehicle the probable cause for hard steering could be
A.Low tyre pressure
B.Bent wheel spindle
C.Tie rod ends tight
D.Excessive castor
E.Any of the above
Answer» E. Any of the above

94.An opposed cylinder engine has
A.One crankshaft and two camshafts
B.One crankshaft and one camshafts
C.Two crankshafts and two camshafts
D.Two crankshafts and four camshafts
E.Two crankshafts and one camshaft
Answer» C. Two crankshafts and two camshafts

95.For car speed upto 100 kmph the mean deceleration in m/s2 taken as
A.4.5
B.3.5
C.2.5
D.1.5
E.5
Answer» C. 2.5

96.Which motor cycle has maximum power rating?
A.Rajdoot
B.Yezdi
C.Jawa
D.Yamaha
E.Bullet
Answer» D. Yamaha

97.Two speed reverse gear arrangement is generally provided in case of
A.Standard wagon
B.Jeep
C.Ambassador car
D.Metador
E.Tractors
Answer» E. Tractors

98.Worn out carburettor jets are likely to cause
A.More noise
B.Excess fuel consumption
C.Knocking
D.Engine warm up
E.Excess engine output
Answer» B. Excess fuel consumption

99.The firing order in the case of a four-cylinder I.C. engine (inline) is given as
A.1-2-3-4
B.1-4-3-2
C.1-2-4-3
D.none of the above
E.None of the above
Answer» C. 1-2-4-3
Explanation: The firing order for a four-cylinder internal combustion engine is typically 1-2-4-3, where the cylinders are numbered from the front of the engine to the back. This firing order is commonly used in many four-cylinder engines because it provides smooth and even power delivery, as each cylinder fires in a balanced sequence.

 (2)

100.Most of the mopeds in India have capacity of
A.50 c.c.
B.250 c.c.
C.10 c.c.
D.150 c.c.
E.174 c.c.
Answer» A. 50 c.c.

101.Morse Test in multicylinders is used to determine
A.Air flow to engine
B.Mechanical efficiency
C.Volumetric efficiency
D.BHP
E.IHP
Answer» B. Mechanical efficiency

102.In case of tractors the springs provided on rear wheel are
A.No spring is provided
B.Helical
C.Depend on the design
D.ombination of helical and leaft spring
E.Leaf type
Answer» A. No spring is provided

103.Which one of the following is the trouble due to clutch?
A.Dragging
B.Rattling
C.Slipping
D.Grabbing
E.All of the above
Answer» E. All of the above

104.Diesel fuel in a cylinder of CL engine will ignite when temperature of compressed air is
A.1000?C
B.1200?C
C.1500?C
D.2000?C
E.None of the above
Answer» A. 1000?C

105.The function of condenser in the ignition circuit of an SI engine is
A.to interrupt the battery current
B.to enhance the circuit voltage
C.to avoid arcing at the contact breaker and to cause faster decay of primary current
D.none of the above
E.None of the above
Answer» C. to avoid arcing at the contact breaker and to cause faster decay of primary current

106.Which of the following vehicle does not have battery?
A.Ambassador car
B.Maruti car
C.Vespa scooter
D.Tata truck
E.None of the above
Answer» C. Vespa scooter

107.The device in the cooling system that increses the boiling point of the water in the system is called
A.Drain plug
B.Pressure cap
C.Radiator
D.Water jacket
E.Vacuum valve
Answer» B. Pressure cap

108.In a diesel engine a clogged nozzle could result in
A.Excessive fuel consumption
B.Over-rich mixture
C.Excessive smoke
D.Failure to start
E.Any of the above
Answer» E. Any of the above

109.For a spark plug M 14 x 1.25 the last figure 1.25 stands for
A.Gap between electrodes in mm
B.Pitch of plug thread
C.Electrode diameter in mm
D.Tip width in mm
E.Size of plug thread
Answer» B. Pitch of plug thread

110.The knocking in S.I. engines is characterised by sudden auto-ignition of the change
A.nearest to the spark plug
B.farthest away from the spark plug
C.in the middle from the spark plug
D.none of the above
E.None of the above
Answer» B. farthest away from the spark plug

111.Ignition coil is used to
A.Step down voltage
B.Step up power
C.Step down current
D.Step up voltage
E.Step up current
Answer» D. Step up voltage

112.Radiator tubes are generally made of
A.Brass
B.Steel
C.Plastics
D.Rubber
E.Cast iron
Answer» A. Brass

113.Increasing the temperature of intake air in an I.C. engine will
A.increase the efficiency
B.decrease the efficiency
C.increase or decrease the efficiency
D.None of the above
E.Low ambient temperature
Answer» B. decrease the efficiency

114.The Diesel fuel pump is designed to supply fuel
A.At constant quantity at all engine speeds
B.In excess quantity than required by the injection pump
C.Just sufficient against the demand of the injection pump
D.In sufficient quantity in accordance with the engine speed
E.In less quantity than required by the injection pump
Answer» D. In sufficient quantity in accordance with the engine speed

115.The phenomenon by which a fuel catches fire without external flame is known as
A.pre-ignition
B.detonation
C.ignition lag
D.auto-ignition
E.None of the above
Answer» D. auto-ignition

116.Air resistance to a car at 20 kmph is R. The air resistance at 40 kmph would be
A.4R2
B.2 R
C.R2
D.R
E.4 R
Answer» C. R2

117.The knocking in C.I. engine can be prevented if the first element of the fuel and air is having
A.low density
B.medium density
C.high density
D.none of the above
E.None of the above
Answer» C. high density

118.Exhaust gas leakage into the cooling system is most likely be due to defective
A.Cylinder head gasket
B.Manifold gasket
C.Water pump
D.Radiator
E.Any of the above
Answer» A. Cylinder head gasket

119.The value overlap in case of four stroke petrol engine is approximately
A.30?
B.60?
C.90?
D.120?
E.None of the above
Answer» A. 30?

120.Driving wheel hearings in automobiles are always
A.Bush bearing
B.Clad metal bearings
C.Anti-friction bearings
D.Either (A) or (B)
E.Either (B) or (C)
Answer» C. Anti-friction bearings

121.The level of electroyte in automobiles battery should be
A.Exactly at the level of the plates
B.15 mm below the top of plates
C.5 – 10 mm below the top of plates
D.Upto the maximum permissible level
E.10 – 15 mm above top of plates
Answer» E. 10 – 15 mm above top of plates

122.The exhaust value remains open approximately for
A.160?
B.180?
C.190?
D.235?
E.None of the above
Answer» D. 235?

123.As the number of cylinders on multi-cylinder engines increases the power to weight ratio
A.Has nothing to do with number of cylinders
B.Decreases
C.Increases
D.Remains the same
E.Becomes zero
Answer» B. Decreases

124.Which of the following part is not needed on spark ignition engines using magneto ignition?
A.Battery
B.Spark plug
C.Distributor
D.Induction coil
E.None of the above
Answer» A. Battery

126.In case of Diesel engines into the engine cylinder during suction stroke
A.air and fuel is drawn
B.only fuel is drawn
C.only air is drawn
D.none of the above
E.None of the above
Answer» C. only air is drawn

127.Too early ingition in SI engine will cause
A.pinking, power loss
B.hotter running, power loss
C.power loss, higher fuel consumption
D.none of the above
E.None of the above
Answer» A. pinking, power loss

128.Castor is
A.forward tilt of the king pin
B.backward tilt of the king pin
C.either of (A) and (B) above
D.none of the above
E.None of the above
Answer» C. either of (A) and (B) above

129.Ignition advance is expressed in terms of
A.Crank angle
B.Millimetres of piston travel before TDC
C.Time in milliseconds
D.Any of the above
E.None of the above
Answer» D. Any of the above

130.The most popular firing order in case of cylinder in-line IC engine is
A.1-2-3-4
B.Alcohol
C.1-4-2-3
D.4-3-2-1
E.1-3-4-2
Answer» E. 1-3-4-2

131.The quantity of oil delivered by injection pump in diesel engine is controlled by
A.upward movement of control helix
B.downward movement of control helix
C.rotation of control helix
D.none of the above
E.None of the above
Answer» C. rotation of control helix

132.As a rule, before the pistons are removed it is necessary to remove the
A.Piston rings
B.Circlip
C.Camshaft
D.Crankshaft
E.Gudgeon pin
Answer» A. Piston rings

133.Deposit of carbon in the exhaust system
A.Will have no effect on back pressure
B.Will reduce back pressure
C.Will increase back pressure
D.Will result in black smoke
E.Will increase noise level
Answer» C. Will increase back pressure

134.In case of a Petrol engine, the spark plug should produce the spark
A.exactly at the end of compression stroke
B.slightly before the end of compression stroke
C.slightly after the end of exhaust stroke
D.none of the above
E.None of the above
Answer» B. slightly before the end of compression stroke

135.In four cylinder engines the ignition advance depends on
A.Quality of fuel
B.Engine speed
C.Cylinder dimensions
D.(A) and (B) only
E.(A), (B) and (C) together
Answer» D. (A) and (B) only

136.In an automobile engine the temperature of the piston will be more at
A.The piston walls
B.The skirt of the piston
C.The piston rings
D.The piston pin
E.The crown of the piston
Answer» E. The crown of the piston

137.If a lead acid battery is fully charged at specific gravity of 1.28 and fully discharged at specific gravity of 1.11 then at specific gravity of 1.19, the battery will be
A.nearly fully charged
B.more than 50% charged
C.50% charged
D.less than 50% charged
E.None of the above
Answer» D. less than 50% charged

138.Generally speaking for better efficiency of IC engine the valves must
A.open before the beginning of a stroke and close before the end of a stroke
B.open after the beginning of a stroke and close before the end of a stroke
C.open after the beginning of a stroke and close after the end of a stroke
D.open before the beginning of a stroke and close after the end of a stroke
E.None of the above
Answer» D. open before the beginning of a stroke and close after the end of a stroke

139.The inlet value remains open approximately for
A.160?
B.180?
C.190?
D.235?
E.None of the above
Answer» D. 235?

140.Maximum danger of ol dilution by fuel in an engine occurs when
A.Engine is running at overload
B.Engine is running at rated load
C.Engine is running on lean mixture
D.Choke circuit is cut in for too long a period
E.All of the above
Answer» D. Choke circuit is cut in for too long a period

141.In the fuel injection pumps for Diesel engine the effective pressure strokes of the plungers in the fuel injection pump are regulated by means of a
A.Camshaft
B.Check valve
C.Needle valve
D.Control rack
E.Fuel pump
Answer» D. Control rack

142.A laminated glass upon cracking
A.Bursts into sharp edged fragments
B.Bursts into granular pieces
C.Sandwitched layer traps the fragments
D.Breaks into the form of crystals
E.None of the above
Answer» C. Sandwitched layer traps the fragments

143.In an internal combustion engine the approximate percentage of the combustion heat that passes to the cylinder walls is
A.75%
B.10%
C.5%
D.30%
E.60%
Answer» D. 30%

144.In case of oil bath type air cleaner, the oil sediments formed by the dust must be removed
A.Monthly
B.After about 500 km
C.Weekly
D.After about 5000 km
E.Every day
Answer» D. After about 5000 km

145.Which one of the followings is used in S.I. engines?
A.spark plug
B.injector
C.cross-head
D.none of the above
E.None of the above
Answer» A. spark plug

146.In a S.I. engine the intake valve closes
A.35? to 80? after BDC
B.25? to 80? before BDC
C.At TdDC
D.10? to 20? before
E.At BDC
Answer» A. 35? to 80? after BDC

147.In a Diesel engine the duration between the time of injection and the time of ignition is called
A.Spil cut off
B.Delay period
C.Period of injection
D.Period of ignition
E.None of the above
Answer» B. Delay period

148.Poor compression in a two stroke engine cannot be due to
A.Leaky valves
B.Broken piston rings
C.Leaking cylinder head gasket
D.Poor fits between pistons, rings and cylinders
E.Any of the above
Answer» A. Leaky valves

149.The angle between the cord and the centre line of the tread is called
A.tread angle
B.side wall angle
C.crown angle
D.none of the above
E.None of the above
Answer» C. crown angle

151.In a S.I. engine burned white deposit on spark plug with molten globules indicates that the engine has been generally operating on
A.Most economical mixture
B.Slightly rich mixture
C.Stoichiometric mixture
D.Too rich mixture
E.Too lean mixture
Answer» E. Too lean mixture

152.Gum content of petroleum fuels is mainly due to
A.concentration of sulphides and disulphides
B.evaporation loss of lighter fractions
C.oxidation of unsaturated bydrocarbons
D.All of the above
E.None of the above
Answer» C. oxidation of unsaturated bydrocarbons

153.A spark voltage needs a voltage of
A.440 V
B.220 V
C.12 V
D.24 V
E.5000 – 15000 V.
Answer» E. 5000 – 15000 V.

154.CFR engine is a
A.high speed engine
B.multi-cylinder four stroke engine
C.2 and 4 stroke engine
D.variable compression ratio engine
E.None of the above
Answer» D. variable compression ratio engine

155.During discharge of a battery, the sulphuric acid in the electrolyte is replaced by
A.Lead sulphate
B.Water
C.Hydrogen
D.Ions
E.Oxygen
Answer» B. Water

156.The spark advance in SI engine is adjusted to obtain maximum pressure
A.10 – 12? past TDC
B.at TDC
C.10 – 12? before TDC
D.none of the above
E.None of the above
Answer» A. 10 – 12? past TDC

157.In a four wheel drive the number of gear boxes is
A.2
B.4
C.1
D.One gear box with more gears
E.Depends on the design of vehicle
Answer» A. 2

158.Air injection in case of S.I. engine refers to injection of
A.Doesn’t exist
B.Liquid fuel only
C.Air only
D.Air and fuel mixture
E.Super charging
Answer» B. Liquid fuel only

159.The instrument used to check the state of charge of a battery is
A.Battery eliminator
B.Hygrometer
C.Hydrometer
D.Anemometer
E.Battery charger
Answer» C. Hydrometer

160.Which fully charged the specific gravity of acid in a battery is usually
A.1.28
B.1.12
C.0.74
D.0.84
E.1
Answer» A. 1.28

161.The number of exhaust manifolds in a V-8 engine
A.Eight
B.One
C.There is no exhaust manifold
D.Two
E.Four
Answer» D. Two

162.In the fuel injection pump of a Diesel engine, the fuel injection timing is adjusted by adjusting the
A.Delivery valve
B.Pump camshaft
C.Lift of plunger
D.Rotation plunger
E.Tappets
Answer» D. Rotation plunger

163.Which of the following is a front wheel drive vehicle?
A.Matador
B.Ambassador
C.Premier Padmini
D.Maruti
E.None of the above
Answer» D. Maruti

164.In an Ambassador car the number of forward gears provided is
A.2
B.6
C.5
D.4
E.3
Answer» D. 4

165.Which of the following hydrocarbon has ring structure?
A.Paraffin
B.Olefin
C.Diolefin
D.Naphthene
E.None of the above
Answer» D. Naphthene

166.Brake lining is mounted on
A.Brake shoe
B.Brake drum
C.Master cylinder
D.Wheel cylinder
E.Any of the above
Answer» A. Brake shoe

167.Water in lubricating oil aids in
A.Burning
B.Dilution
C.Formation of solution
D.Oxidation
E.Decomposition
Answer» C. Formation of solution

168.In a Diesel engine, the temperature of gases under full load may be of the order of
A.100?C
B.900-1000?C
C.150-200?C
D.200-300?C
E.500-550?C
Answer» E. 500-550?C

169.In transmission system if the reverse gear slips out, the probable cause could be
A.Reverse sliding gear teeth worn out
B.Main shaft spines worn
C.Reverse idler gear teeth worn
D.Insufficient gear mesh
E.Any of the above
Answer» E. Any of the above

170.The device for smoothening out the power inpulses from the engine is called
A.Clutch
B.Differential
C.Flywheel
D.Gear box
E.Torque convertor
Answer» C. Flywheel

171.In which case the air fuel ratio is expected to be the highest?
A.Two stroke petrol engine
B.Gas turbine
C.Four stroke diesel engine
D.Two stroke diesel engine
E.Four stroke petrol engine
Answer» B. Gas turbine

172.Too rich mixture for a S.I. engine means air : fuel ratio of about
A.15 ; 1
B.13 ; 1
C.17 ; 1
D.14 ; 1
E.10 ; 1
Answer» E. 10 ; 1

173.During idling in a CI engine, the air fuel ratio may be of the order of
A.30
B.10
C.15
D.20
E.5
Answer» A. 30

174.In automobile ignition system contact breaker is used for
A.Opening and closing the primary circuit
B.opening and closing the secondary circuit
C.increasing the duration of spark
D.increasing the intensity of spark
E.None of the above
Answer» A. Opening and closing the primary circuit

176.The ignition coil acts as
A.A capacitor
B.An inductor
C.A RC circuit
D.A step up transformer
E.A step down transformer
Answer» D. A step up transformer

177.If brake wheels get locked before the vehicle stops, the vehicle is said to be
A.Rubbing
B.Slipping
C.Rolling
D.Skidding
E.Sliding
Answer» D. Skidding

178.Theoretically air required for the combustion of one kg of fuel is
A.17.4 kg
B.16.7 kg
C.18.9 kg
D.10 kg
E.14.5 kg
Answer» E. 14.5 kg

179.Quality of diesel oil can be expressed in terms of cetane number and also
A.aniline point
B.API gravity
C.SAE number
D.diesel index
E.None of the above
Answer» B. API gravity

180.Automobile gears are generally made of
A.Mild steel
B.Alloy steel
C.Cast iron
D.Brass
E.Stainless steel
Answer» B. Alloy steel

181.In a S.I. engine high air velocity through air hom may be of the order of
A.100 m/s
B.10 m/s
C.1 m/s
D.5 m/s
E.50 m/s
Answer» A. 100 m/s

182.In automobile, probable cause for ineffective brakes could be
A.Grease on lining
B.Excessive lining wear
C.Drums scored
D.Any of above
E.None of the above
Answer» D. Any of above

183.If the oil level in the oil pan of the engine is maintained above the gauge mark, the likely damage it may cause is
A.Engine fuming
B.Carbon deposits
C.Blue colour in exhaust
D.All of the above
E.None of the above
Answer» D. All of the above

184.A two stroke engine is generally preferred to a four stroke engine because
A.Shocks and vibrations are less
B.It can be earily started
C.Its size is smaller
D.Its fuel consumption is low
E.It can be easily controlled
Answer» C. Its size is smaller

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185.High gum content in petrol may result in
A.detonation
B.misfiring
C.clogging of carburettor
D.none of the above
E.None of the above
Answer» C. clogging of carburettor

186.Cetane number of a Diesel fuel is measure of
A.Ignition quality
B.Viscosity
C.Volatility
D.Delay period
E.A.P.I. specific gravity
Answer» D. Delay period

187.Efficiency of an IC engine is normally of the order of
A.30-35%
B.50-60%
C.10-15%
D.80-90%
E.Alcohol
Answer» A. 30-35%

188.For flow of petrol from fuel tank to the carburettor, the fuel system includes
A.A vacuum pump
B.A suction pump
C.A float
D.A fuel pump
E.An acceleration pump
Answer» D. A fuel pump

189.Connecting rods are generally of the following form
A.Forged I section
B.Cast iron square section
C.Forged square section steel
D.Cast iron triangular section
E.Forged round section
Answer» A. Forged I section

190.Piston compression rings are made of
A.Bronze
B.White metal
C.Aluminium
D.Steel
E.Cast iron
Answer» E. Cast iron

191.Cetane number of Diesel oil normally available in market is in the range.
A.75 — 80
B.60 — 65
C.90 — 105
D.90 — 100
E.45 — 50
Answer» E. 45 — 50

192.If a spark plug does not fire, the probable cause could be
A.Cracked porcelain
B.Carbonized porcelain
C.Moisture or dirt accumulation on porcelain
D.Weak ignition coil
E.Any of the above
Answer» B. Carbonized porcelain

193.Grease cannot be used as lubricant for the lubrication of
A.Front wheel bearings
B.Slip joint
C.Input shaft
D.Coolant pump
E.Transmission
Answer» E. Transmission

194.Boiling range of kerosene is
A.50 to 100?C
B.100 to 150?C
C.150 to 300?C
D.350 to 500?C
E.None of the above
Answer» C. 150 to 300?C

195.The process of removing the burnt gases from the engine cylinder by the fresh charge coming into the cylinder from the crank-case, is known as
A.cleaning
B.priming
C.scavenging
D.none of the above
E.None of the above
Answer» C. scavenging

196.In a four stroke SI engine the inlet valve opens
A.at TDC and closes at BDC
B.10? before TDC and closes 10? after BDC
C.10? before TDC and closes 10? after BDC
D.10? before TDC and closes 50? after BDC
E.None of the above
Answer» D. 10? before TDC and closes 50? after BDC

197.Which one of the following is not a part of the chassis?
A.Steering system
B.Wheels
C.Rear axles
D.Passenger seats
E.Front axle
Answer» D. Passenger seats

198.The most widely used brakes are operted
A.Electrically
B.Hydraulically
C.By vacuum
D.Combination of (A) and (C)
E.Mechanical
Answer» B. Hydraulically

199.Which part of the engine is directly driven by the starting motor?
A.Flywheel
B.Camshaft
C.Crankshaft
D.Pulley
E.Any of the above
Answer» A. Flywheel

201.In order to engage securely and prevent dragging the clearance between release bearing and release collar in a clutch is usually
A.30 – 35 mm
B.20 – 25 mm
C.40 – 50 mm
D.2 – 3 mm
E.10 – 15 mm
Answer» D. 2 – 3 mm

202.Which of the following action reduces the life of tyre?
A.Low air pressure
B.Extra load
C.Frequent braking
D.All of the above
E.None of the above
Answer» D. All of the above

203.Loss of engine compression can result from
A.Wrong timing
B.Defective fan belt
C.Worn out rings
D.Excessive tappet clearance
E.Excessive tappet clearance
Answer» C. Worn out rings

204.Excess oil consumption in engine may be due to
A.Leakage of oil through oil pan gasket
B.Poor quality or improper viscosity of engine oil
C.Excessive oil pressure
D.Badly worn piston rings
E.Any of the above
Answer» E. Any of the above

205.A hot plug has a
A.Heat dam
B.Short heat path
C.Long insulator
D.Long heat path
E.Short insulator
Answer» A. Heat dam

206.Acid used in automobile battery is
A.Hydrochloric acid
B.Sulphuric acid
C.Dilute nitric acid
D.Concentrated nitric acid
E.Hydrofluoric acid
Answer» B. Sulphuric acid

207.Diesel engine as compared to petrol engines require
A.Biggenr flywheels
B.Same size flywheel
C.Smaller flywheel
D.Flywheel whose size may be less or more depending on several other factors
E.No flywheel
Answer» A. Biggenr flywheels

208.In a Diesel engine the fuel injection pressure is usually in the range
A.20 to 25 atm
B.10 to 15 atm
C.30 to 40 atm
D.60 to 70 atm
E.100 to 170 atm
Answer» E. 100 to 170 atm

209.In case of petrol engine, pre-ignition of the charge during compression stroke is
A.not possible
B.possible
C.possible during power stroke
D.none of the above
E.None of the above
Answer» B. possible

210.Common causes for excessive oil consumption include
A.Defective radiator
B.Short trips and cold weather
C.Heavy oil and light bearings
D.Frequent oil changes
E.High speed and worn engine
Answer» E. High speed and worn engine

211.Two SI engines run at same speed and develop same power but have different compression ratio. The engine with higher compression ratio will have its ignition advance
A.more than
B.less than
C.equal to
D.none of the above
E.None of the above
Answer» B. less than

212.Exhaust valve temperature is about
A.1000?C
B.150?C
C.500?C
D.100?C
E.35?C
Answer» C. 500?C

213.Which oil is more viscous
A.SAE 50
B.SAE 40
C.SAE 70
D.SAE 80
E.SAE 30
Answer» D. SAE 80

214.Commonly used antifeeze solution in automobiles is
A.Freon 12
B.Ammonium chloride
C.Carbon disulphide
D.Liquid ammonia
E.Gloycol
Answer» E. Gloycol

215.The heating value of diesel is approximately
A.7500 kcal/kg
B.6500 kcal/kg
C.10,000 kcal/kg
D.8500 kcal/kg
E.125000 kcal/kg
Answer» C. 10,000 kcal/kg

216.For S.I. engine carburettor the float is usually made of
A.Brass sheet
B.Nylon
C.Cast iron
D.Either (A) or (B)
E.Either (B) or (C)
Answer» D. Either (A) or (B)

217.The exhaust value of a four stroke I.C. engine should open
A.exactly at the end of expansion stroke
B.slightly after the end of expansion stroke
C.slightly before the end of expansion stroke
D.none of the above
E.None of the above
Answer» C. slightly before the end of expansion stroke

218.In case of petrol engines, into the engine cylinder during suction stroke
A.air and fuel is drawn
B.only fuel is drawn
C.only air is drawn
D.none of the above
E.None of the above
Answer» A. air and fuel is drawn

219.Which of the following is a diesel engined vehicle?
A.Ambassador Mark II
B.Fiat 1100
C.Premier Padmini
D.Standard Gazel
E.None of the above
Answer» E. None of the above

220.In case of friction clutch the coefficient of friction is expected to be
A.0.4 to 0.5
B.0.85 to 0.90
C.0.1
D.0.01
E.0.15 to 0.17
Answer» A. 0.4 to 0.5

221.The octane rating of petrol commercially available is usually
A.110 – 125
B.90 – 100
C.100 – 105
D.125 – 140
E.85 – 90
Answer» E. 85 – 90

222.In a typical medium speed 4-stroke cycle diesel engine, the inlet value
A.Opens at 20? before TDC and closes at 35? after BDC
B.Opens at TDC and closes at BDC
C.Opens at 10? after TDC and closes at 20? after BDC
D.Remains open for 200?C
E.None of the above
Answer» A. Opens at 20? before TDC and closes at 35? after BDC

223.The advanctage of stratified charge engine is
A.better part load efficiency
B.resistance to knocking tendency
C.better volumetric efficiency
D.All of the above
E.None of the above
Answer» D. All of the above

224.Accumulation of rust and scale in the engine cooling system will cause
A.Reduced output
B.Overheating
C.Slow warm up
D.Low exhaust temperature
E.More noise
Answer» B. Overheating

226.In a Diesel engine the function of a fuel injector is
A.To mix fuel and air
B.To ignite air-fuel mixture
C.To provide adequate air fuel mixture for combustion
D.To provide flame front for ignition
E.To spray atomized fuel in the cylinder
Answer» E. To spray atomized fuel in the cylinder

227.The angle during which both the inlet and exhaust valves remain open simultaneously, is known as
A.exhaust value angle
B.value angle
C.value overlap
D.none of the above
E.None of the above
Answer» C. value overlap

228.The angle of camber is usually
A.5? to 7?
B.Between
C.Less than
D.2? to 5?
E.More than 7?
Answer» B. Between

229.The valve is opened as the cam lobe on the cam raises the
A.Piston pin
B.Valve lifter
C.Bearing
D.Valve guide
E.Valve seat
Answer» B. Valve lifter

230.The device used to reduce the exhaust noise is known as
A.Exhaust manifold
B.Exhaust pipe
C.Tail pipe
D.Muffler
E.None of the above
Answer» D. Muffler

231.The firing order in case of four cylinder in-line engines is uaually
A.1-2-4-3
B.1-3-4-2
C.1-4-3-2
D.Either (A) or (B)
E.Either (B) or (C)
Answer» E. Either (B) or (C)

 (1)

232.The power developed in four stroke I.C. engine, for the same engine speed and cylinder volume, as compared to that of a two stroke engine is
A.two times
B.equal
C.one half
D.none of the above
E.None of the above
Answer» C. one half

233.Power assisted brakes are often provided on
A.motor cycles
B.air cooled engine vehicles
C.slow speed vehicles like road rollers etc.
D.heavy duty vehicles
E.None of the above
Answer» D. heavy duty vehicles

234.The magneto in an automobile is basically
A.Magnetic circuit
B.Transistor
C.A.C. generator
D.D.C. generator
E.Capacitor
Answer» D. D.C. generator

235.Mixing of fuel and air in case of a diesel engine occurs in
A.Injector
B.Engine cylinder
C.Inlet valve
D.Fuel pump
E.Inlet manifold
Answer» B. Engine cylinder

236.The minimum cranking speed in petrol engines is
A.2 – 3 rpm
B.Equal to the normal operating speed
C.60 – 80 rpm
D.Half of operating speed
E.One fourth of operating speed
Answer» C. 60 – 80 rpm

237.The function of a governor in automobile is to
A.Limit the power
B.Maintain constant engine speed
C.Effect maximum fuel economy
D.Maintain constant engine speed when the vehicle speed changes
E.Limit the speed
Answer» E. Limit the speed

238.The term master cylinder is associated with
A.Braking system
B.Starting mechanism
C.Engine
D.Lubrication system
E.Cooling cylinder
Answer» A. Braking system

239.Ignition advance in S.I. engine is not the direct function of
A.mixture strength
B.compression ratio
C.grade of petrol
D.load on engine
E.None of the above
Answer» D. load on engine

240.As carbon accumulates in a cylinder it causes an increase in
A.Clearance volume
B.Ignition time
C.Volumetric efficiency
D.Piston displacement
E.Effective compression ratio
Answer» E. Effective compression ratio

241.The speed of the engine is increased or decreased by operating
A.Throttle valve
B.Choke valve
C.Steering
D.Clutch
E.Any of the above
Answer» A. Throttle valve

242.Ethyl fluid is used as
A.To improve lubricating quality of fuel
B.To increase octane rating of fuel
C.As a detonating agent
D.To increase cetane rotary of fuel
E.As a superior type of fluid compared to others
Answer» B. To increase octane rating of fuel

243.Which tractor has an air cooled engine
A.Hindustan
B.HMT
C.Ford
D.Ferguson
E.Eicher
Answer» E. Eicher

244.The number of cylinders in an Ambassador car is
A.4
B.2
C.8
D.6
E.3
Answer» A. 4

245.Engine oil is usually renewed after
A.2500 – 6000 km
B.24 km
C.500 km
D.100 km
E.100 km
Answer» A. 2500 – 6000 km

246.By supercharging
A.Power stroke becomes stronger
B.Loss in exhaust is reduced
C.Engine can be made to run smoother
D.Thermal efficiency of the engine can be improved
E.None of the above
Answer» D. Thermal efficiency of the engine can be improved

247.Automobile radiator is filled with
A.Hard water
B.Acidic water
C.Alkaline water
D.Rain water
E.Soft water
Answer» E. Soft water

248.Brake shoes are made of
A.Pressed steel
B.Cast aluminium
C.Plastic fibre
D.Either (A) or (B)
E.Either (A) or (C)
Answer» D. Either (A) or (B)

249.Theoretical correct air-fuel ratio for tetrol engine is
A.6 ; 1
B.9 ; 1
C.12 ; 1
D.15 ; 1
E.20 ; 1
Answer» D. 15 ; 1

251.Magneto ignition system is used in scooters and motor cycles because
A.it is less costly
B.it is less bulky and requires less maintenance
C.it gives higher voltage across the terminals of spark plug
D.none of the above
E.None of the above
Answer» B. it is less bulky and requires less maintenance

252.In case of automobile moving under normal road conditions the amount of fuel injected is proportional to
A.speed of vehicle
B.square of speed of vehicle
C.square root of speed of vehicle
D.none of the above
E.None of the above
Answer» A. speed of vehicle

253.As a general rule if facing on the friction disc are worn down to the rivet heads
A.The clutch should be replaced
B.The linkage should be adjusted
C.Rivets head should be filed
D.Rivets should be replaced
E.The friction disc should be replaced
Answer» E. The friction disc should be replaced

254.The disadvantage of stratified charge engine is
A.reduced power for a given engine size
B.higher weight for bhp
C.poor reliability
D.All of the above
E.None of the above
Answer» D. All of the above

255.The device which is used for atomising and vapourising the petrol fuel and mixing it with the air in varying proportions, to suit the changing operating conditions of the engine, is known as
A.injector
B.Spark plug
C.carburettor
D.none of the above
E.None of the above
Answer» C. carburettor

256.As the gap between the electrodes of the spark plug increases
A.spark intensity increases
B.voltage required for sparking increases
C.voltage required for sparking decreases
D.frequency of sparking increases
E.None of the above
Answer» B. voltage required for sparking increases

257.In order to easily start the precombustion chamber diesel engine, in the early cold morning
A.Spark plug is used
B.Injector is used
C.Glow plug is used
D.Petrol is poured through inlet manifold
E.None of the above
Answer» C. Glow plug is used

258.Pick up the wrong statement
A.Theoretically correct air fuel mixture for petrol engine is about 1.5 : 1
B.Diesel engines are CI engines
C.SI engines are quality governed engines
D.High speed compression engines operate on dual combustion cycle
E.Thermal efficiency of diesel engine is about 34%
Answer» C. SI engines are quality governed engines

259.While starting a engine the starter pinion meshes with
A.Gears in differential
B.Engine flywheel ring gear
C.Clutch
D.Gears in gear box
E.Propellor shaft
Answer» B. Engine flywheel ring gear

260.The efficiency of mechanical brakes is usually
A.85 – 95 percent
B.60 – 70 percent
C.30 – 40 percent
D.99 percent
E.95 – 98 percent
Answer» B. 60 – 70 percent

261.Engine dynamo is usually driven by
A.V-belt drive
B.Gear drive
C.Chain drive
D.P-I-V drive
E.Flat belt drive
Answer» A. V-belt drive

262.In actual practice, the inlet value of a four stroke I.C. engine should open
A.exactly at the start of suction stroke
B.slightly after the start of suction stroke
C.slightly before the start of the suction stroke
D.none of the above
E.None of the above
Answer» C. slightly before the start of the suction stroke

263.Gudgeon pins are made of
A.White metal
B.Hardened and ground steel
C.Aluminium
D.Cast iron
E.Same material as that of piston
Answer» B. Hardened and ground steel

264.In a four stroke four cylinder petrol engine, the speed of distributor shaft is
A.Half the engine speed
B.Four times the engine speed
C.Same as engine speed
D.Double of engine speed
E.Quarter of the engine speed
Answer» A. Half the engine speed

265.Instead of values, ports are used in case of
A.Petrol engine
B.Diesel engine
C.Four-stroke I.C. engines
D.Two-stroke I.C. engines
E.None of the above
Answer» D. Two-stroke I.C. engines

266.In triptane rating the non-knocking reference fuel is
A.leaded 2,3,3 trimethyl butane
B.isobutane, C4H10
C.butadiene C4H6
D.none of the above
E.None of the above
Answer» A. leaded 2,3,3 trimethyl butane

267.Which type of pump is preferred for pumping lubricating oil in automobile
A.Reciprocating type
B.Centrifugal pump with impeller shrouded on one side only
C.Open impeller type
D.Gear pump
E.Centrifugal pump with impeller shrouded on both sides
Answer» D. Gear pump

268.In cars a temperature indicating instrument is usually provided which indicates the temperature of
A.Lubricating oil
B.Air surrounding engine cylinders
C.Jacket cooling water
D.Engine piston
E.Engine cylinder
Answer» C. Jacket cooling water

269.Which one of the following is not the trade name of tractor in India?
A.Standard
B.Kirloskar
C.Escort
D.Ford
E.HMT
Answer» A. Standard

270.The brake pipes in hydraulic brake systems are made of
A.Aluminium
B.Plastic
C.Steel
D.Rubber
E.Polyvinylchloride
Answer» C. Steel

271.The maximum temperature in an I.C. engine is of the order of
A.2000-2500?C
B.1000-1500?C
C.1500-2000?C
D.2500-3000?C
E.500-1000?C
Answer» A. 2000-2500?C

272.In automobile ignition system, a distributor is mounted on
A.low voltage side
B.high voltage side
C.both low as well as high voltage side
D.neither low voltage nor high voltage side
E.None of the above
Answer» B. high voltage side

273.The purpose of crankcase ventilation is to
A.Assist in maintaining the viscosity of oil
B.Supply oxygen to the crank case
C.Partly convert engine power into electric power
D.Remove vaporized water and fuel
E.Cool the oil
Answer» D. Remove vaporized water and fuel

274.In a S.I. engine, when most economical mixture is supplied, the colour of exhaust flame is expected to be
A.Yellow-red to red
B.Dark red
C.Bluish, transparent
D.Dark blue to reddish-yellow
E.Colour of exhaust flame has nothing to do with the mixture composition
Answer» D. Dark blue to reddish-yellow

276.The castor is called positive when
A.the top of the king pin axis is inclined to the rear of the vehicle
B.the top of the king pin axis is inclined to the front of the vehicle
C.the top of the king pin axis is inclined to the left of the vehicle
D.the top of the king pin axis is inclined to the right of the vehicle
E.None of the above
Answer» A. the top of the king pin axis is inclined to the rear of the vehicle

277.In a four stroke S.I engine the exhaust valve usually opens
A.35? to 60? after BDC
B.35? to 60? before BDC
C.At BDC
D.10? to 20? before TDC
E.At TDC
Answer» B. 35? to 60? before BDC

278.For a four stroke engine the maximum power output is reached at an air quantity
A.Deficient by 15 to 20 percent
B.Deficient by 25 to 30 percent
C.Surplus by 15 to 20 percent
D.Surplus by 5 to 10 percent
E.Deficient by 5 to 10 percent
Answer» E. Deficient by 5 to 10 percent

279.Which of the following is not incorporated in scooters?
A.Air cleaner
B.Muffler
C.Fuel pump
D.Fuel filter
E.None of the above
Answer» C. Fuel pump

280.The exhaust gases are driven out from engine cylinder by the fresh charge of the fuel enter in the cylinder, in case of
A.Petrol engine
B.Diesel engine
C.Four stroke I.C. engines
D.Two-stroke I.C. engines
E.None of the above
Answer» D. Two-stroke I.C. engines

281.The freezing temperature of ordinary petrol is
A.? 30?C to ? 50?C
B.? 100?C to ? 117?C
C.10?C
D.0?C
E.? 5?C to ? 10?C
Answer» A. ? 30?C to ? 50?C

282.The function of governor is
A.To increase the speed of the engine at full load
B.To decrease the speed of the engine at no load
C.To maintain constant load at varying speeds
D.To maintain constant speed at varying loads
E.None of the above
Answer» D. To maintain constant speed at varying loads

283.Air supply in case of Diesel engines is usually
A.5 to 10 percent surplus
B.About 40 percent surplus
C.10 percent deficient
D.Stoichometric
E.15 to 20 percent surplus
Answer» B. About 40 percent surplus

284.The capacity of a battery is usually expressed in terms of
A.Volts
B.Weight
C.Current in amperes
D.Ampere hours
E.Watts
Answer» D. Ampere hours
Explanation: The capacity of a battery is usually expressed in terms of ampere-hours (Ah), which is a unit of electric charge. This represents the amount of electrical energy that can be stored in the battery and is typically used to determine how long a battery will last before needing to be recharged or replaced. Voltage (volts) and current (amperes) are also important factors in determining the capacity of a battery, but they are not typically used as the primary measure of capacity. Weight and watts are also not typically used to express the capacity of a battery.

 (1)

285.Oil pan is attached
A.In a separate unit away from the crankcase
B.At the top of the cylinder block
C.To the bottom of the cylinder block
D.Adjacent to oil filters
E.At the outside wall of the crank case
Answer» C. To the bottom of the cylinder block

286.Dynamo in automobile is a
A.series generator
B.shunt generator
C.either of (A) and (B) above
D.none of the above
E.None of the above
Answer» B. shunt generator

287.In an engine the probable cause for low oil pressure cannot be
A.Use of dilute engine oil
B.Excessive clearances at valve pushers
C.Air leaks in oil pump suction line
D.Use of heavy engine oil
E.Water, sludge, dirt etc. restricting pump intake screen
Answer» D. Use of heavy engine oil

288.In a four stroke engine, each cylinder has
A.Three valves
B.One valve
C.Four valves
D.Number of valves depends upon the engine design
E.Two valves
Answer» E. Two valves

289.An automobile tyre will wear rapidly in case
A.It is overloaded
B.It is misaligned
C.It is incorrectly inflated
D.It is more frequently subjected to braking
E.Any of the above
Answer» E. Any of the above

290.About 5% of fuel in the lubricating oil lessen the ability to lubricate by about
A.30%
B.90%
C.10%
D.1%
E.5%
Answer» A. 30%

291.In forced feed lubrication system the device used to guard against excessive oil pressure is known as
A.Balancer
B.Stop valve
C.Release chamber
D.Pressure actuator
E.Relief valve
Answer» E. Relief valve

292.In actual practice, the exhaust value of a four stroke I.C. engine should close
A.exactly at the end of expansion stroke
B.slightly before the end of exhaust stroke
C.slightly after the end of exhaust stroke
D.none of the above
E.None of the above
Answer» C. slightly after the end of exhaust stroke

293.Latex
A.A milky juice of rubber
B.A plastic
C.A cover on wires carrying current to spark plugs
D.A variety of lubricant
E.A variety of P.V.C.
Answer» A. A milky juice of rubber

294.The pressure of air for braking in case of heavy duty trucks in usually of the order of
A.Depends upon the road conditions
B.1 to 2 atm
C.14 to 17 atm
D.4 to 7 atm
E.2 to 3 atm
Answer» D. 4 to 7 atm

295.The operation of removing trapped air from hydraulic braking system is known as
A.Pressurization
B.Tapping
C.Trapping
D.Clearing
E.Bleeding
Answer» E. Bleeding

296.For faultless operation of hydraulic braking system
A.Brake fluid should be pure
B.Boiling point of brake fluid should be high
C.Viscosity of brake fluid should be high
D.There should be minimum amount of trapped air
E.All of the above
Answer» D. There should be minimum amount of trapped air

297.If the first element of the fuel and C.I. air is having high temperature and a short ignition delay, then knocking will
A.accelerate
B.decrease
C.remain constant
D.none of the above
E.None of the above
Answer» B. decrease

298.Noisy brakes indicate
A.Grit on lining
B.Drums scored
C.Loose lining screws
D.Distored brake spiders
E.Any of the above
Answer» E. Any of the above

299.Steering gear
A.rack and pinion type
B.worm and roller type
C.recirculating ball type
D.Any of the above
E.None of the above
Answer» D. Any of the above

301.Which of the following symptoms will not show that the combustion is necessarily complete or not?
A.Presence of free carbon in exhaust
B.Presence of carbon monoxide in the exhaust
C.Presence of oxygen is the exhaust
D.Presence of nitrogen in the exhaust
E.None of the above
Answer» D. Presence of nitrogen in the exhaust

302.The turbulence in diesel engine ensures to
A.Increase the compression pressure
B.Reduce the engine vibrations
C.Bring the fuel quickly in contact with air
D.Increase the fuel consumption
E.Increase the volumetric efficiency
Answer» C. Bring the fuel quickly in contact with air

303.In a 2-stroke S.I. engine
A.exhaust and transfer (inlet) ports open and cloe simultaneously
B.exhaust port opens 5? before the transfer port and closes 5? after the transfer port
C.exhaust port opens 5? ahead of the transfer port but both ports close simultaneously
D.none of the above
E.None of the above
Answer» B. exhaust port opens 5? before the transfer port and closes 5? after the transfer port

304.In a S.I. engine, if the colour of exhaust flame is bluish, transparent, it indicates that the mixture supplied to the engine is
A.Suitable for maximum output
B.Too lean
C.Too rich
D.Chemical correct
E.Most economical
Answer» B. Too lean

305.The escape of burned gases from the combustion chamber past the pistons and into the crank case is called
A.Gas-loss
B.Crank case explosion
C.By-pass
D.Blow-by
E.Passed gas
Answer» D. Blow-by

306.Which instrument is used to measure specific gravity
A.Thermometer
B.Hydrometer
C.Hydrometer
D.Anemometer
E.None of the above
Answer» C. Hydrometer

307.The stationary part of the Wankel engine has an inner contour of
A.elliptical section
B.two lobed epitrochoid section
C.four lobed epitrochoid section
D.none of the above
E.None of the above
Answer» B. two lobed epitrochoid section

308.The efficiency of an oil bath type air cleaner is usually
A.90%
B.50%
C.60%
D.99%
E.80%
Answer» D. 99%

309.LPG mainly consists of
A.Methane and ethane
B.Propane and butane
C.Petrol and diesel
D.Hexane and butadiene
E.None of the above
Answer» B. Propane and butane

310.Over heating of a two stroke air cooled engine cannot be due to
A.Incorrect ignition or valve timing
B.Too lean fuel mixture
C.Lack of cylinder jacket cooling water
D.Partly restricted exhaust system
E.Restricted air cleaner
Answer» C. Lack of cylinder jacket cooling water

311.The diagram which shows the correct crank positions corresponding to the opening and closing of the valves, is known as
A.indicator diagram
B.value timing diagram
C.axial force diagram
D.None of the above
E.None of the above
Answer» B. value timing diagram

312.Which is the Diesel engined vehicle
A.Ambassador Mark II
B.Premier padmini
C.Standard Gazel
D.Maruti
E.None of the above
Answer» E. None of the above

313.Executive clutch clearance caused by improper adjustment or wear of sliding sleeve, generally results in
A.Clutch slip
B.Clutch failure to disengage
C.Clutch plate over heating
D.Uneven clutch engagement
E.Any of the above
Answer» B. Clutch failure to disengage

314.Balls for a ball bearing are made of
A.Stainless steel
B.Carbon chrome steel
C.High speed steel
D.Mild steel
E.Stainless steel
Answer» B. Carbon chrome steel

315.In spark plug the gap between the electrodes is
A.10 mm
B.around 5 mm
C.around 1 mm
D.less than 1 mm
E.None of the above
Answer» D. less than 1 mm

316.The device used to measure the clearance between the valve and tappet of an internal combustion engine is
A.Slip gauge
B.Thickness gauge
C.Feeler gauge
D.Snap gauge
E.Micrometer
Answer» C. Feeler gauge

317.The condenser in ignition circuit of an S.I. engine
A.increases the battery voltage
B.decreases the current from battery
C.avoids arcing at contact breaker
D.none of the above
E.None of the above
Answer» C. avoids arcing at contact breaker

318.In an automobile the probable cause for dragging brakes could be
A.Lack of clearance
B.Drums out of round
C.Loose wheel bearings
D.Weak retracting spring
E.Any of the above
Answer» E. Any of the above

319.When fully charged, the terminal voltage per cell for a battery is
A.1.5 volts
B.2.7 volts
C.1.7 volts
D.6 volts
E.12 volts
Answer» B. 2.7 volts

320.For the best utilization of fuel, in the engine cylinder, the air supply should be
A.About 10% surplus
B.15 to 20 percent deficient
C.About 25% surplus
D.5 to 10 percent deficient
E.Chemically correct
Answer» A. About 10% surplus

321.The phenomenon that causes pressure waves resulting in vibration of structure, rough running and melting of piston is
A.detonation
B.pre-ignition
C.knocking
D.none of the above
E.None of the above
Answer» A. detonation

322.Bead wires are made of
A.steel
B.copper
C.zinc
D.Aluminium
E.None of the above
Answer» A. steel

323.The efficiency of hydraulic braking system is
A.50 – 60 percent
B.40 – 50 percent
C.25 – 40 percent
D.About 90 percent
E.60 – 70 percent
Answer» D. About 90 percent

324.Diesel engines are generally preferred for road transport these days because of low
A.Maintenance cost
B.Operating cost
C.Initial cost
D.Prime cost
E.Manufacturing cost
Answer» B. Operating cost

326.The knocking in S.I. engines can be prevented if the end mixture is having
A.high density
B.medium density
C.low density
D.none of the above
E.None of the above
Answer» C. low density

327.The number of plies in a truck tyre is usually
A.2
B.5–8
C.8–10
D.3
E.12–16
Answer» E. 12–16

328.A four sylinder four stroke petrol engine running at 1000 rpm will have in all how many sparks in one minute?
A.250
B.500
C.1000
D.2000
E.None of the above
Answer» B. 500

329.Which one of the following is mounted between the engine and gear box?
A.Propellor shaft
B.Differential gear
C.Reduction gear
D.Clutch
E.None of the above
Answer» D. Clutch

330.A thermostat is provided in automobile engines for
A.Controlling the temperature of the piston
B.Regulating the temperature of lubricating oil
C.Regulating the temperature of suction air
D.Regulating the temperature of haust gases.
E.Controlling the temperature of the cooling system
Answer» E. Controlling the temperature of the cooling system

331.Bead of a tyre constitutes
A.metal foundations of the tyre
B.side walls of the tyre
C.shoulder region
D.none of the above
E.None of the above
Answer» A. metal foundations of the tyre

332.The probable cause for uneven wear of tyres for a truck could be
A.Low tyre pressure
B.Excessive camber
C.Tyres overloaded
D.Incorrect castor
E.Any of the above
Answer» E. Any of the above

333.Circumferential grooves on tyres
A.Lessen the danger of skidding
B.Increase load carrying capacity
C.Provide good traction
D.Remove any stones etc. from sticking to the tyre
E.All of the above
Answer» A. Lessen the danger of skidding

334.Which one of the following is a correct statement
A.the exhaust valve of a four stoke I.C. engine should open exactly at the end of expansion stroke
B.in actual practice, inlet valve of a four stroke I.C. engine should open exactly at the start of suction stroke
C.the inlet valve remains open approximately for 180?
D.valve overlap is the angle during which both the inlet and exhaust valves remain open simultaneously
E.None of the above
Answer» D. valve overlap is the angle during which both the inlet and exhaust valves remain open simultaneously

335.A heat-treated glass generally used in automobiles upon cracking bursts into
A.Sharp edged fragments
B.Small particles
C.Does not disintegrate
D.Either of the above
E.None of the above
Answer» B. Small particles

336.In a multi-cylinder engine, missing in one cylinder is likely to result from
A.Clogged exhaust
B.Vapour lock
C.A defective spark plug
D.An overheated engine
E.None of the above
Answer» C. A defective spark plug

337.Dirt or gum in fuel nozzle or jets may cause
A.Excessive fuel consumption
B.Uneven engine speed
C.Smoky black exhaust
D.Lack of engine power
E.White exhaust
Answer» C. Smoky black exhaust

338.When not in use, the self-discharge of an automobile battery in dry weather is usually
A.0.5 to 1%
B.7 to 7.5%
C.Not more than 10%
D.Not more than 15%
E.Any of the above
Answer» A. 0.5 to 1%

339.If the cut-off is decreased, the efficiency of Diesel cycle
A.increases
B.decreases
C.is same
D.none of the above
E.None of the above
Answer» A. increases

340.Connecting rod is attached to the piston by the
A.Piston pin
B.Rod cap
C.Cap bolt
D.Lower cap
E.Cap roller bearing
Answer» A. Piston pin

341.Clutch slippage while clutch is engaged is particularly noticeable
A.During acceleration
B.At low speed
C.While starting the engine
D.During idling
E.During braking
Answer» A. During acceleration

342.The function of Diesel feed pump (when ever provided) is to
A.Pump the fuel to the injector
B.Pump the fuel from the tank into the injection pump
C.Send back the fuel from the injector into the tank
D.Pump the oil into the main gallery
E.Pump the fuel from the injection pump to the injector
Answer» B. Pump the fuel from the tank into the injection pump

343.In automobile braking system retarders are
A.chemicals which limit the rate of pressure rise in engine
B.chassis components which face wind resistance
C.auxillary brakes which supplement the main brake
D.none of the above
E.None of the above
Answer» C. auxillary brakes which supplement the main brake

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