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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.
 36 W.
 30 W.
 25 W.

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Electrical Machines
In electric locomotive which of the following motor are used ?

  Separately compound motor.
  Synchronous motor.
  Shunt motor.
  DC series motor.

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 440 A.
 44 A.
 40 A.
 400 A.

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Electrical Machines
For high current and low voltage rating which winding is employed to DC machine?

 Both wave and lap winding.
 Wave winding.
 Lap winding.
 No wave and lap winding.

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Electrical Machines
In an auto-transformer, power is transferred through

None of these
 both A and B.
 conduction process only.
 induction process only.

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Electrical Machines
In a 3 - Φ IM in order to eliminate cogging the number of stator slots must be

  either (B) or (C).
  equal to number of rotor slots.
  an integral multiple of number of rotor slots.
  unequal to number of rotor slots and skewed in shape.

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