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Electrical Machines

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

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

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Electrical Machines
To get the speed of DC motor is more than normal without wastage of electrical energy _____________ is used.

  Any of above method.
  None of above.
  Rheostatic control.
  Ward Leonard control.

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Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 625 W
 600 W
 700 W
 650 W

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Electrical Machines
CRGO steel is used in the core of transformer to reduce

  hysteresis loss.
 ohmic loss.
 eddy current loss.
 both eddy current and hysteresis loss.

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Electrical Machines
Which of these types of motor is used in elevators?

 None of these.
 DC shunt motor.
 DC series motor.
 DC compound motor.

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Electrical Machines
For a transformer to be tested at full load conditions but consuming only losses from the main, we do

 OC and SC tests
None of these
 back to back test
 load test

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