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Electrical Machines

Electrical Machines
The flux involved in the emf equation of a transformer has

  maximum value.
 rms value.
 total value.
 average value.

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Electrical Machines
Field weakening control method is used for the _________ ?

 above rated speed
 below rated speed
None of these
 both A and B

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Electrical Machines
When operating, two or more transformers in parallel, % impedance of these transformers should be

 such that actual impedance of all transformers would be same.
 inversely proportional to MVA rating of transformers.
  same.
 proportionate to MVA rating of transformers.

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Electrical Machines
Width of a carbon brush should be equal to

 the width of the 1 to 2 commutator segment.
 less than the width of commutator segment.
 the width more than 3 commutator segment.
 the width of the 2 to 3 commutator segment.

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Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?

 1
 6
 4
 2

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Electrical Machines
The synchronous speed of an induction motor will be increased by

  increasing number of poles.
  speed can not be increased.
  decreasing of frequency.
  increasing of frequency.

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MORE MCQ ON Electrical Machines

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