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Electrical Machines

Electrical Machines
In DC generators, the residual magnetism is of the order of

 10 %.
  20 %.
  2.5 %.
  15 %.

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Electrical Machines
If the excitation is critical, the power factor of the alternator is

 leading power factor.
 unity power factor.
 lagging power factor.
None of these

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Eddy current losses
 Hysteresis losses
 Both 1 and 2
 Copper losses

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Electrical Machines
Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :

 1 and 3
 2 and 3
 1 and 2
 1, 2 and 3

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Electrical Machines
The reduced air gap results in an increase

  starting torque.
  breaking torque.
  power factor.
  cost of operation.

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Electrical Machines
In DC shunt motor if load is increased, the speed

 remains constant.
 reduce slightly.
 increased slightly.
 increase proportional.

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