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Electrical Machines

Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 60°.
 30°.
 90°.
 120°.

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Electrical Machines
In a synchronous machine, if the field flux axis is ahead of the armature field axis in the direction of rotation, the machine operating is

  synchronous motor.
  asynchronous generator.
  synchronous generator.
  asynchronous motor.

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Electrical Machines
Hysteresis loss is proportional to

 f1.5.
 f3.
  f.
 f2.

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Electrical Machines
If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

 Fmax.
 (1/2)Fmax.
 3Fmax.
  (3/2)Fmax.

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Electrical Machines
Number of tappings for each equalizer ring is equal to

  number of poles.
  number of parallel paths.
  number of pole pairs.
  number of commutator segments.

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Electrical Machines
In DC series motor the speed is ______________ proportional to the armature current.

 none of these.
 has no relation.
 directly.
 inversely.

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MORE MCQ ON Electrical Machines

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