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Electrical Machines

Electrical Machines
In DC generator on no-load, the air gap flux distribution in space is

  sinusoidal.
  flat topped.
  pulsating.
 triangular.

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Electrical Machines
The sparking at the the brushes, in a DC machines is due to

  reactance voltage.
 high resistance of carbon brushes.
 presence of commutator.
 armature reaction.

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Electrical Machines
The constant losses in transformer is/are

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

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Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.3.
  0.54.
  1.
 0.7.

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Electrical Machines
In a synchronous motor torque or load angle δ ------------- with increase in load

 increases
 remains unaffected
None of these
 decreases

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Electrical Machines
A DC generator can be considered as

 power pump.
 rectifier.
 rotating amplifier.
 prime mover.

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MORE MCQ ON Electrical Machines

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