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Electrical Machines

Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 4KVA
 0KVA
 20KVA
 16KVA

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Electrical Machines
Inter pole winding is connected in-------------------------- ?

 parallel with armature
 parallel with main poles
 series with armature
 series with main poles

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Electrical Machines
Armature reaction in dc motor results

  short circuit.
  open circuit.
  increase in speed.
  decrease in speed.

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Electrical Machines
The armature reaction mmf in a DC machines has a form of

 rectangular.
 trapezoidal.
  triangular.
 sinusoidal.

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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.
 3Fmax.
  (3/2)Fmax.
 (1/2)Fmax.

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Electrical Machines
Breather is provided in a transformer to

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

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