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Electrical Machines

Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 28 W.
 30 W.
 36 W.
 25 W.

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Electrical Machines
In induction motor wound rotor motor is mainly is used in application where

  high starting torque.
 power factor is less.
  low starting torque.
  less costly motor is not required.

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Electrical Machines
What is the full form of MNP?

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

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Electrical Machines
Damper winding is used to

 increase the load current.
 suppress the hunting.
 decrease the load current.
 both 1 and 2.

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Electrical Machines
Speed of DC motor can be controlled by varying

 resistance of armature culture.
 applied voltage.
 all of these.
 its flux oer pole.

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Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?

 2
 6
 1
 4

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