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Electrical Machines

Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

 5.46 KW.
 1.644 KW.
  2.73 KW.
 0.9103 KW.

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Electrical Machines
What are the starters used for starting of cage motors?

 DOL starter.
 Star-delta starter.
  All of these.
 Auto transformer starter.

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

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

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Electrical Machines
The constant losses in transformer is/are

 hysteresis loss.
 eddy current loss.
 both 2 and 3.
 copper loss.

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Electrical Machines
In a synchronous machine, if the field flux axis is ahead of the armature field axis in the direction of rotation, the machine operating is

  asynchronous motor.
  synchronous motor.
  synchronous generator.
  asynchronous generator.

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Electrical Machines
Dynamic braking is very effective for

 separately excited motors.
 shunt motors.
 series motors.
 differential compound motors.

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