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Electrical Machines

Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 72
 36
 37
 74

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Electrical Machines
The current drawn by a DC motor at the time of starting is

 Zero.
 Normal.
 Very high.
 Very low.

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Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

 2 to 3.
 3 to 5.
 1.0.
  1.5 to 2.

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Electrical Machines
In salient pole synchronous machine, if direct axis reactance and quadrature axis reactance is equal, then power developed due to reluctance is

 zero
 maximum
 any of the above
 infinite value

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Electrical Machines
Breather is provided in a transformer to

 provide cold air in transformer.
  absorb moisture of air during breathing.
 absorb moisture from air entering in transformer.
 filter the transformer oil.

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Electrical Machines
For high current and low current rating which winding is employed to DC machine?

 Both lap and wave winding
 None of above
 Wave winding
 Lap winding

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MORE MCQ ON Electrical Machines

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