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Electrical Machines

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

 20KVA
 4KVA
 16KVA
 0KVA

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Electrical Machines
In a DC generator, the ripples in the direct emf generated are reduced by employing

  carbon brushes.
  commutator with large number of segments.
 graphite brushes.
  equalizer rings.

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Electrical Machines
If the excitation is reduced, the power factor is

None of these
 unity power factor
 lagging power factor
 leading power factor

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Electrical Machines
A smaller air gap in a polyphase induction motor helps to

  reduce the magnetizing current.
  reduce the chance of cogging.
  reduce the chance of crawling.
  increase the starting torque.

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Electrical Machines
A shaded pole single phase induction motor can be used for

 personal computers as cooling fan
 food mixers
 wet grinders
 tape recorders

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Electrical Machines
Which of the following is/are the methods to reduce the armature reaction and its effects?

 compensating winding
 pole chamfering
All of these
 pole stacking

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