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Electrical Machines

Electrical Machines
The induction motor shaft is made of

  aluminium.
  stainless steel.
  cast iron.
  mild steel.

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Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Nr
 Zero
 Ns
 S.Ns

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Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 40%
 5%
 10%
 19%

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Electrical Machines
In DC machine torque depends on which of the following?

 both A and B
 speed
 flux (φ)
 armature current (I)

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Electrical Machines
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when

  there is no load on the generator.
  the generator runs on overload.
  the generator runs on full load.
  the generator runs on designed speed.

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Electrical Machines
Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque

 DC Shunt Motor
 Separately Excited DC Motor
 Compound Wound DC Motor
 DC Series Motor

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MORE MCQ ON Electrical Machines

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