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Electrical Machines

Electrical Machines
In a synchronous motor, damper windings are provided on

  stator frame.
None of these
  pole faces.
  rotor shaft.

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Electrical Machines
Iron loss in a transformer mainly occurs in

 steel core in transformer.
 winding of transformer.
 transformer insulating oil.
 iron made tank of transformer.

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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

 30 W.
 36 W.
 28 W.
 25 W.

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Electrical Machines
Regenerative braking is possible in

 DC shunt motor with armature resistance control.
  DC shunt motor with field weakening control.
 DC series motor.
 DC compound motor.

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Electrical Machines
Tertiary winding in a transformer is mostly

 zig - zag delta connected.
 star connected.
 zig - zag star connected.
  delta connected.

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Electrical Machines
The dc motor which can provide zero speed regulation at full load without any controller, is

 cumulative compound.
 series.
 differential compound.
 shunt.

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MORE MCQ ON Electrical Machines

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