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Electrical Machines

Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

 0.9103 KW.
 5.46 KW.
  2.73 KW.
 1.644 KW.

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Electrical Machines
The slip of an induction motor normally does not depend on which of the following?

  Core loss component.
 Rotor speed.
 Shaft torque.
 Synchronous speed.

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Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 +3%
 +3.33%
 -3%
 -3.33%

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Electrical Machines
During no load test, an induction motor draws power

  for core loss and copper loss.
  for copper loss and windage friction loss.
  for core loss and windage and friction loss.
  only for the small copper loss.

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Electrical Machines
The DC compound motors are generally

 Level Compound.
 Cummulative compound.
 Differentical compound.
 None of these.

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Electrical Machines
The no load and full load speed of DC mototr are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor?

 18.25%.
 14.28%.
 15.30%.
  16.67%.

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