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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

 f3.
  f.
 f1.5.
 f2.

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Electrical Machines
In travelling cranes for crane travel, trolley and boom hoist which motor is preferred?

  Synchronous motor.
  Slip ring induction motor.
  Stepper motor.
  DC differential compound motor.

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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.
 2.
 1.

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Electrical Machines
Field winding of a DC series motor is usually provided with thick wire

 to reduce the insulation of materials.
 as it carries large load current.
 in order to reduce eddy current to provide large flux.
 to provide large flux.

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Electrical Machines
Maximum power will be developed when back emf is

 double the supply voltage.
 equal to supply voltage.
All of these
 half of the supply voltage.

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Electrical Machines
In DC generators, the brushes remain in contact with conductors which

 lie under south pole.
 lie under north pole.
 lie in the inter polar gaps.
 there is no hard and fast rule for this.

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