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Electrical Machines

Electrical Machines
The no load current in a transformer lags the applied voltage by

 0°.
 90°.
  about 75°.
 about 115°.

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

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Electrical Machines
Transformer cooling and insulating oil must be of

 high viscosity.
  low viscosity.
 low resistivity.
 low BDV.

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Electrical Machines
Under operating conditions the rotor conductor should be _________________ in induction motor.

  semi closed or semi opened.
  always opened.
  always closed.
  none.

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Electrical Machines
Synchronous reactance of an alternator represents

 armature reactance and leakage reactance
 a reactance operating at synchronous speed
 field winding reactance
All of these

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Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

 increased by 20%
 increased by 10%
 reduced by 20%
 reduced by 10%

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