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Electrical Machines

Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

  4.
 32.
 16.
 8.

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Electrical Machines
When an electric train is moving down a hill, the DC motor will operate as

 DC shunt motor.
  DC series motor.
  DC series generator.
 DC shunt generator.

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Electrical Machines
Stray losses in transformer occurs in

 paper insulation in transformers.
 steel core.
 transformer insulating oil.
  winding conductors and steel structures of transformer.

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Electrical Machines
Transformer oil is used as

 an insulator.
 a coolant.
 inert medium.
 both A and B.

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Electrical Machines
Hysteresis loop represents the area of

 copper loss
 total iron losses
 eddy current loss
 hysteresis loss

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Electrical Machines
The breakdown torque of a synchronous motor varies as

 applied voltage V
 1/V
 1/V²
 V²

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