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Electrical Machines

Electrical Machines
The no load current in a transformer lags the applied voltage by

 0°.
 90°.
  about 75°.
 about 115°.

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Electrical Machines
In travelling cranes for crane travel, trolley and boom hoist which motor is preferred?

  Stepper motor.
  Synchronous motor.
  Slip ring induction motor.
  DC differential compound motor.

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Electrical Machines
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when

  there is no load on the generator.
  the generator runs on designed speed.
  the generator runs on full load.
  the generator runs on overload.

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Electrical Machines
Eg (generated emf) and Eb (back emf) both are

 none of above.
 different.
 changes.
 same.

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Electrical Machines
A large series motor is never started without some mechanical load on it because otherwise it will

 open fuse or circuit breaker.
 produce sparking at brushes.
 draw too much current.
 develop excessive speed and damage itself.

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Electrical Machines
Which of the following voltage regulation method is accurate ?

 MMf method
 ZPF method
 Synchronous impedance method
 American standard association method

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