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Electrical Machines

Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 V
 f2
 V2
 f

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Electrical Machines
If the field of a dc shunt motor gets opened while the motor is running, then the

 motor will attain dangerously high speed
 armature will oscillate about original speed as the mean speed
 armature current will drop
 motor will become slow.

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Electrical Machines
In a DC generator the emf generated by the armature is maximum when

 induced voltage is high.
  rate of change of flux is maximum.
 shaft rotation is high.
 rate of change of flux is minimum.

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Electrical Machines
The noise resulting from vibrations of lamination set by magnetic forces, is termed as

 magnetostriction.
  hum.
 zoom.
 boo.

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Electrical Machines
Essential conditions for two DC generators are connecting for parallel operation is/are

 polarities should be same.
 terminal voltage should be same.
 rating of generators should be same.
 both A and B.

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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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