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The pulsation losses are caused by the direct axis pulsation of magnetic flux.
Answer: a Explanation: The pulsation losses are one type of additional iron losses produced. They are produced by the direct axis pulsation of magnetic flux due to the variation of permeance caused by the continuous change in mutual positions of rotor and stator teeth during rotation of rotor.
Answer: a
Explanation: The pulsation losses are one type of additional iron losses produced. They are produced by the direct axis pulsation of magnetic flux due to the variation of permeance caused by the continuous change in mutual positions of rotor and stator teeth during rotation of rotor.
See lessHow many types are the additional losses in iron classified into?
Answer: a Explanation: The additional iron losses are classified into 2 types. They are i) pulsation losses and ii) surface losses.
Answer: a
See lessExplanation: The additional iron losses are classified into 2 types. They are i) pulsation losses and ii) surface losses.
What should be the maximum permissible level for frequency in normal operating conditions?
Answer: b Explanation: The normal condition operation depends upon the frequency levels in the machine. It should not exceed 3 Hz
Answer: b
See lessExplanation: The normal condition operation depends upon the frequency levels in the machine. It should not exceed 3 Hz
What is the use of skin effects in the induction motor?
Answer: c Explanation: The skin effect phenomenon is observed in stator and rotor windings in the induction motor. The effect may be used for improving starting characteristics.
Answer: c
Explanation: The skin effect phenomenon is observed in stator and rotor windings in the induction motor. The effect may be used for improving starting characteristics.
See lessHow can the additional losses be decreased in the induction motor?
Answer: d Explanation: There are 3 methods to decrease the additional losses in induction motor. They are chording the stator winding, skewing the rotor, having a proper slot combination.
Answer: d
Explanation: There are 3 methods to decrease the additional losses in induction motor. They are chording the stator winding, skewing the rotor, having a proper slot combination.
See lessThe additional losses owing to the higher order mmf harmonics occur mainly in windings of squirrel cage rotor.
Answer: a Explanation: The additional losses are depending on the higher order mmf harmonics and skin effect. The losses occur mainly in the squirrel cage rotor.
Answer: a
Explanation: The additional losses are depending on the higher order mmf harmonics and skin effect. The losses occur mainly in the squirrel cage rotor.
See lessWhat factor does the additional copper losses depend upon?
Answer: d Explanation: With a sinusoidal voltage impressed over the terminal of the motor, the additional copper losses are caused. They are caused due to the higher order mmf harmonics and skin effect.
Answer: d
Explanation: With a sinusoidal voltage impressed over the terminal of the motor, the additional copper losses are caused. They are caused due to the higher order mmf harmonics and skin effect.
See lessHow many types of additional losses are present?
Answer: c Explanation: The additional losses are divided into 2 types. They are i) Additional copper loss ii) Additional iron losses.
Answer: c
See lessExplanation: The additional losses are divided into 2 types. They are i) Additional copper loss ii) Additional iron losses.
What is the formula for efficiency at full load?
Answer: a Explanation: First the various losses are calculated for the machine. Then the output obtained is observed and the substitution of the values in the formula gives the efficiency at full load.
Answer: a
Explanation: First the various losses are calculated for the machine. Then the output obtained is observed and the substitution of the values in the formula gives the efficiency at full load.
See lessHow many losses are present in induction motors?
Answer: c Explanation: There are 5 losses present in the induction motor. They are i) Stator copper losses, ii) Rotor copper losses, iii) Stator iron losses, iv) Friction and winding losses, v) Additional losses.
Answer: c
Explanation: There are 5 losses present in the induction motor. They are i) Stator copper losses, ii) Rotor copper losses, iii) Stator iron losses, iv) Friction and winding losses, v) Additional losses.
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