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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

 f1.5.
 f2.
  f.
 f3.

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Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  none of these.
  wound.
  linear.
  cage.

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Electrical Machines
stepped cores are used in transformers in order to reduce

 volume of copper.
 volume of iron.
 reluctance of core.
 iron loss.

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Electrical Machines
What is the full form of MNP?

  Magnetic neutral plane.
  Magnetic neutral pole.
  Magnetic field neutral plane.
  Magnetic field neutral pole.

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Electrical Machines
For which of the following loads, armature reaction is magnetizing in nature?

 pure inductive load
 pure capacitive load
None of these
 pure resistive load

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

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

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