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Electrical Machines

Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 18°
 30°
 36°
 72°

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Electrical Machines
In a transformer operating at constant voltage if the input frequency increases, the core loss

None of these
 decrease.
 remains constant.
 increase.

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

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

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Electrical Machines
What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field?

 Zero
 Slip speed
None of these
 Synchronous speed

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Electrical Machines
Armature reaction of an unsaturated DC machine is

  magnetising.
  none of above.
 demagnetising.
  crossmagnetising.

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Electrical Machines
An unexcited single phase synchronous motor is

 repulsion motor.
  universal motor.
 reluctance motor.
 AC series motor.

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MORE MCQ ON Electrical Machines

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