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Electrical Machines

Electrical Machines
In a synchronous motor, damper windings are provided on

  rotor shaft.
None of these
  stator frame.
  pole faces.

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Electrical Machines
The armature reaction mmf in a DC machines has a form of

  triangular.
 sinusoidal.
 rectangular.
 trapezoidal.

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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is

 50 KVA
 123.3 KVA
 83.33 KVA
 100 KVA

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Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 3 or 4
 2
 0
 1

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Electrical Machines
The constant losses in transformer is/are

 copper loss.
 eddy current loss.
 hysteresis loss.
 both 2 and 3.

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Electrical Machines
A generator may loose residual magnetism due to

  vibrations.
  heating.
  over excitation.
  any of these.

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MORE MCQ ON Electrical Machines

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