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Electrical Machines

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

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

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Electrical Machines
The rotor slots are slightly skewed in squirrel cage induction motor to

 decrease the amount of copper to be used.
 increase the strength of rotor bars.
 reduce the magnetic hum and locking tendency of rotor.
 provide ease of fabrication.

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Electrical Machines
In escalator which motor is used?

  3 - φ IM.
  Universal motor.
  DC shunt motor.
  1 - φ IM.

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Electrical Machines
The main disadvantage(s) of the ward-Leonard system is/are

 high maintenance cost.
 all of above.
 high initial cost.
 poor overall efficiency.

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Electrical Machines
For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with

None of these
 constant supply voltage V, starting torque Tst decreases
 either of these
 constant V, Tst increases

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

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

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