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Electrical Machines

Electrical Machines
The material used for commutator brushes is mostly

 copper.
 cast iron.
  carbon.
 mica.

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Electrical Machines
Star - delta method of starting of motor is not possible in case of

  high speed motor.
  single phase induction motor.
  high torque motor.
  low horse power motor.

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Electrical Machines
The output power of any electrical motor is taken from the

 Coupling mounted on the shaft.
 Armature.
 Field.
 Motor frame.

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Electrical Machines
A generator may loose residual magnetism due to

  over excitation.
  vibrations.
  any of these.
  heating.

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Electrical Machines
When the excitation of normally operating unloaded, salient pole synchronous motor suddenly gets disconnected, it continues to run as a

 switched reluctance motor.
 DC motor.
 induction motor.
 variable reluctance motor.

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Electrical Machines
Flux density under leading pole tips in case of generator will

 either increase or decrease
None of these
 increase
 decrease

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MORE MCQ ON Electrical Machines

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