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Electrical Machines

Electrical Machines
Regenerative braking is not found in which motor?

 DC shunt.
 Induction motor.
 DC compound.
  DC series.

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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

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

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Electrical Machines
Which of the following motors has negative speed regulation?

 Series motors.
 Shunt motors.
 Differential compound motors.
 Both B and C.

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Electrical Machines
If the field of a dc shunt motor gets opened while the motor is running, then the

 motor will become slow.
 motor will attain dangerously high speed
 armature will oscillate about original speed as the mean speed
 armature current will drop

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Electrical Machines
Hunting in a synchronous motor takes place

  when load varies.
  motor is under loaded.
  when supply voltage fluctuates.
  when power factor is unity.

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Electrical Machines
In which of the following generators negative voltage regulation can occur?

 both B and C
 series generators
 over compound generator
 shunt generator

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