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Electrical Machines

Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 0.2 lag
 0.2 lead
 0.9 lag
 unity

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Electrical Machines
A short circuit test on a transformer gives

 copper loss at full load.
 copper loss at over load.
 copper loss at half load.
  copper loss at any load.

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Electrical Machines
Which of the following transformer insulating oil generally used in India?

 Olefin based insulating oil.
  Paraffin based insulating oil.
 Naphtha based insulating oil.
 Aromatics based insulating oil.

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Electrical Machines
When pure inductive load is connected to the alternator, what is the effect of armature reaction?

None of these
 Demagnetization
 Cross magnetization
 Magnetization

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Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 72°
 18°
 30°
 36°

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Electrical Machines
In a three phase slip-ring induction motor, brushes are connected to

  external star-connected resistors.
  3 - Φ AC supply.
  DC supply.
  equalizing coils.

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