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Electrical Machines

Electrical Machines
In alternator, the rotary part is

 core.
 armature.
  magnetic field poles.
 none of these.

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Electrical Machines
An unexcited single phase synchronous motor is

 reluctance motor.
  universal motor.
 AC series motor.
 repulsion motor.

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Electrical Machines
When pure inductive load is connected to the alternator, what is the effect of armature reaction?

 Cross magnetization
 Demagnetization
 Magnetization
None of these

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Electrical Machines
A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is

 4%
 25%
 2%
 5%

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Electrical Machines
Exciting current of an induction motor is

  none of these.
  equal as power transformer.
  lesser than power transformer.
  higher than power transformer.

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Electrical Machines
An induction motor is, in general analogous to

 two winding transformer with secondary open circuited.
 two winding transformer with secondary short circuited.
None of these
 auto transformer.

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