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Electrical Machines

Electrical Machines
From no load to full load the slip will

None of these
 slightly decrease.
 slightly increase.
 not change.

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Electrical Machines
Under operating conditions the rotor conductor should be _________________ in induction motor.

  always opened.
  semi closed or semi opened.
  none.
  always closed.

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Electrical Machines
In diesel engine, gas engine type of machine contains ___________________ pole type of alternator.

 cylindrical.
  salient.
 non uniform cylindrical.
 none of these.

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Electrical Machines
In a transformer which of the following losses are zero?

 Rotational loss
 Iron loss
 Copper loss
All of these

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Electrical Machines
Which of following winding is connected in series with armature winding of DC machine?

 Auxiliary winding.
 Compensating winding.
 Commutating pole winding.
 Both Compensating and Commutating pole winding.

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Electrical Machines
Current in a coil undergoing commutation is not able to get reversed completely by the end of commutation period. It is due to

None of these
 armature emf.
  coil resistance.
  reactance voltage induced in the coil.

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