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Electrical Machines

Electrical Machines
A generator may loose residual magnetism due to

  heating.
  vibrations.
  any of these.
  over excitation.

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Electrical Machines
Transformer action requires a

 alternating magnetic lux.
 increasing magnetic flux.
 constant magnetic flux.
 alternating electric flux.

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Electrical Machines
Hysteresis loss will depends on

 f1.6
 f³
 f
 f²

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Electrical Machines
The change in speed of a DC generator due to increased load is corrected by

 increasing armature cooling.
  increasing terminal voltage.
  increasing input power of the prime mover.
  increasing armature resistance.

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Electrical Machines
In auto transformer if the turn ratio is K, what is the power transferred inductively?

 K × input power
 (1-K) × input power
 both A and B
None of these

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Electrical Machines
A 3 - φ induction motor can also be referred to as a

  asynchronous motor.
  shunt motor.
  repulsion motor.
  transformer.

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MORE MCQ ON Electrical Machines

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