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Electrical Machines

Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 0KVA
 20KVA
 16KVA
 4KVA

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

 Very low.
 Zero.
 Very high.
 Normal.

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Electrical Machines
The total core loss of a 400 V, 50 Hz transformer is 2400W, when it is supplied by 200 V, 25 Hz loss is 800W. Calculate eddy current loss and hysteresis loss?

 1600W, 800W
 1000W , 1400W
 800W, 1600W
 1400W, 1000W

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Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  25 Hz.
  60 Hz.
  16.67 Hz.
  50 Hz.

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Electrical Machines
To avoid formation of grooves in the commutator

  brush position has no effect on the commutator grooving.
None of these
  the brushes of opposite polarity should track each other.
 the brushes of same polarity should track each other.

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Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

 one fourth.
 half.
 double.
 4 times.

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