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Electrical Machines

Electrical Machines
In alternator, the rotary part is

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

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Electrical Machines
Hunting in a synchronous motor takes place

  motor is under loaded.
  when load varies.
  when supply voltage fluctuates.
  when power factor is unity.

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Electrical Machines
Compensating winding are used to rectify the flux density waveform at

None of these
  region under main pole.
 interpole region.
 throughout the air gap.

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Electrical Machines
The principle of operation of a 3 - Φ induction motor is almost similar to that of

  transformer with secondary short circuited.
  repulsion start induction motor.
  synchronous motor.
  capacitor start induction motor.

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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are

 1/√3, 1/√3
 1/3, 1/3
 1/√3, 1/3
 1/3, 1/√3

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Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

 225 V.
  222 V.
 230 V.
 220 V.

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