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Electrical Machines

Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 28 W.
 25 W.
 36 W.
 30 W.

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Electrical Machines
In a synchronous motor hunting can be reduced to minimum possible by

  any of above methods.
  using a flywheel.
  designing the motor for adequate synchronizing power.
  providing damper winding in the rotor pole faces.

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Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

 decreases with decrease in the load torque.
 increases with increase in the load torque.
 remains constant.
 decreases with increase in the load torque.

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Electrical Machines
The primary and secondary windings of a transformer are

  conductively linked.
  inductively linked.
 electrically linked.
 mechanically linked.

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Electrical Machines
Armature reaction of an unsaturated DC machine is

  magnetising.
  crossmagnetising.
 demagnetising.
  none of above.

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

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

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