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Electrical Machines

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

  20 %.
  15 %.
 10 %.
  2.5 %.

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

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

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Electrical Machines
The DC generator runs at a speed of 1000 rpm and flux per pole is 0.2 Wb, number of poles are 2 the winding is wave wound and having 480 conductors. The critical speed is 1200 rpm. Then the generated emf ( Eg )

 2000 Volt.
  0 Volt.
 1600 Volt.
 1500 Volt.

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Electrical Machines
Which of the following motor is more expensive for same KW output rating ?

 Induction motor.
 Synchronous motor.
 DC Shunt Motor
 AC single phase motor.

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Electrical Machines
Which of following winding is connected in series with armature winding of DC machine?

 Compensating winding.
 Commutating pole winding.
 Both Compensating and Commutating pole winding.
 Auxiliary winding.

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Electrical Machines
The armature of DC motor is laminated

 to reduce the eddy current loss.
 to reduce the hysteresis loss.
 to reduce the inductor.
 to reduce the mass.

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