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Electrical Machines

Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 any of the above
 greater than
 equal to
 less than

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

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

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

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

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Electrical Machines
Under which of the following conditions hunting of synchronous motor is likely to occur ?

  Periodic variation of load.
  Over-loading for long period.
  Over-excitation.
  Small and constant load.

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Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

 T2 ∝ P3.
 T is independent of P.
 T ∝ √P.
 T ∝ P.

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Electrical Machines
Essential conditions for two DC generators are connecting for parallel operation is/are

 terminal voltage should be same.
 both A and B.
 polarities should be same.
 rating of generators should be same.

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