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Electrical Machines

Electrical Machines
Universal motor have which of the following application?

  Lift.
  Domestic pump.
  Food mixer.
  Traction.

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Electrical Machines
Which of the following windings are necessary in case of all dc machines?

 closed winding
 wave winding
 lap winding
 open type winding

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Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 increases
 remains unaffected
 decreases
 any of the above

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Electrical Machines
For successful parallel operation of two single phase transformers, the most essential condition is that their

 KVA ratings are equal
 turn- ratios are exactly equal
 polarities are properly connected
 percentage impedances are equal

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Electrical Machines
For high current and low voltage rating which winding is employed to DC machine?

 No wave and lap winding.
 Lap winding.
 Wave winding.
 Both wave and lap winding.

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Electrical Machines
The polarity of a DC generator can be reversed by

 any of above.
 reversing the field current.
 reversing field electric current as well as direction of rotation.
 increasing field current.

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