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Electrical Machines

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

 30°.
 120°.
 60°.
 90°.

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Electrical Machines
What will be the eddy current loss if the supply frequency of a transformer becomes double?

 Eight times.
 Doubled.
 Remains same.
 Four times.

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Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor

 Oscillates around the rated speed.
 Remains unchanged.
 Increases.
  Decreases.

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Electrical Machines
In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called

  harmonics.
  cogging.
  crawling.
  resonance.

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Electrical Machines
In an auto-transformer, power is transferred through

 both A and B.
 conduction process only.
None of these
 induction process only.

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Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is

 θelec = P/2*θmech
 θelec = θmech
 θelec = 4/P*θmech
 θelec = 2/P*θmech

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MORE MCQ ON Electrical Machines

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