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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

None of these
 GNA
 either GNA or MNA
 MNA

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Electrical Machines
Synchronous reactance of an alternator represents

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

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Electrical Machines
Wave winding is employed in DC machine of

 high current and low voltage rating.
 high current and low voltage rating.
 low current and low voltage rating.
  low current and high voltage rating.

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Electrical Machines
Transformer cooling and insulating oil must be of

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

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Electrical Machines
No load test on induction motor is conducted to find which of the following losses?

All of these
 Stator copper loss
 Stator core loss
 Rotational loss

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Electrical Machines
At what power factor, the voltage regulation of a transformer can be zero ?

 Zero power factor.
 Lagging power factor.
  Leading power factor.
 Unity power factor.

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