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Electrical Machines

Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 V
 f
 f2
 V2

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Electrical Machines
The flux is maximum in the following part of a DC motor:

 pole core.
 under the interpole.
 under trailing pole tip.
 under leading pole tip.

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

 both A and B
 none of above
 armature circuit
 shunt field

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Electrical Machines
For successful parallel operation of two single phase transformers, the most essential condition is that their

 polarities are properly connected
 percentage impedances are equal
 turn- ratios are exactly equal
 KVA ratings are equal

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Electrical Machines
A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

 somewhat more than 230 V
 somewhat less than 230 V
 6 V
 230 V

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

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

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MORE MCQ ON Electrical Machines

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