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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 1 Hz
 0 Hz
 50 Hz
 5 Hz

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Electrical Machines
Hysteresis loop represents the area of

 copper loss
 hysteresis loss
 eddy current loss
 total iron losses

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Electrical Machines
What is the effect of armature reaction ?

 Armature flux distorts the main field flux.
  Both option B and C.
 Armature flux weakens the main field flux.
 None of the options.

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Electrical Machines
Value of specific electric loading of Induction motor is in the range of

 30000 - 100000 ampere conductor / metre.
  5000 - 45000 ampere conductor / metre.
  400 - 4000 ampere conductor / metre.
 40 - 400 ampere conductor / metre.

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Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

 burn.
 run at very low speed.
 start haunting.
 run at very high speed.

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Electrical Machines
Direction of the current in the compensating winding is________ to the direction of current in the armature conductors?

 same
None of these
 either of these
 exactly opposite

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MORE MCQ ON Electrical Machines

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