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Electrical Machines

Electrical Machines
Hunting phenomenon is observed in which motor?

 Both A and C.
  Synchronous motor.
 Induction motor.
 DC motor.

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Electrical Machines
Rotor resistance speed control is used in

 squirrel cage induction motor.
 dc shunt motor.
 synchronous motor.
 slip ring induction motor.

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Electrical Machines
A compound motor has

  tertiary winding.
  only shunt field winding.
  both shunt and series field winding.
  only series field winding.

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Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 S
 1-S
 1/S
 1/(1-S)

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Electrical Machines
Hunting in a synchronous motor takes place

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

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Electrical Machines
In a synchronous machine, if the field flux axis is ahead of the armature field axis in the direction of rotation, the machine operating is

  synchronous motor.
  synchronous generator.
  asynchronous motor.
  asynchronous generator.

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