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Electrical Machines

Electrical Machines
Which type of motors are preferred in lifts?

 DC shunt motors.
 DC compound motors.
 DC series motors.
None of these

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Electrical Machines
Armature reaction in dc motor results

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

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

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

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Electrical Machines
In a synchronous motor torque or load angle δ ------------- with increase in load

None of these
 decreases
 remains unaffected
 increases

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Electrical Machines
If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of

  8.
 4.
 1.
 2.

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Electrical Machines
If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?

 It will remain the same.
  It will be doubled.
  It will becomes four times.
  It will be halved.

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