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?

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

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Electrical Machines
In DC machines, the interpoles are provided

  both (B) and (C).
 to counteract demagnetizing effect of armature mmf in commutating zone.
  to make commutation spark less.
 to counteract the reactance voltage and the cross-magnetizi

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Electrical Machines
If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then

 lap-wound machine will have more rated voltage and less current
 wave-wound machine will have more rated voltage and less current
 lap-wound machine will have more rated voltage and more current
 wave-wound machine will have more rated current and more voltage

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