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Electrical Machines

Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 2 V
 4 V
 1 V
 0 V

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Electrical Machines
A 4 pole DC generator rotates at 1500 rpm. How many times in a second, will the emf induced in each armature conductor changes its direction?

 750.
 200.
 500.
  100.

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Electrical Machines
The current drawn by a DC motor at the time of starting is

 Normal.
 Zero.
 Very low.
 Very high.

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Electrical Machines
Which of the following are variable losses?

 armature copper loss
 hysteresis loss
 eddy current loss
 shunt field copper loss

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Electrical Machines
Which of the following relation is correct?

 Xd > Xq.
None of these
 Xd < Xq.
 Xd = Xq.

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Electrical Machines
Which of the following induction motor has maximum speed?

 6 pole.
 8 pole.
 4 pole.
  2 pole.

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