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Electrical Machines

Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.5.
  0.1.
  1.0.
  0.05.

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Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at

 lagging power factor.
 any of the above.
 leading power factor.
 unity power factor.

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Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Zero
 S.Ns
 Ns
 Nr

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Electrical Machines
In DC generator, armature reaction refers to what?

 Effect of field flux on the armature flux.
 Effect of armature flux on the load.
None of these
  Effect of armature flux on the main field flux.

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Electrical Machines
The slip of an induction motor normally does not depend on

  core loss component.
  rotor speed.
  shaft torque.
  synchronous speed.

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Electrical Machines
A 2 KVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer would occur when the total loss is

 250 W
 400W
 300 W
 500 W

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