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ELECTRICAL MACHINES

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?

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

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Electrical Machines
In a transformer which of the following losses are zero?

 Copper loss
All of these
 Rotational loss
 Iron loss

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Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 V
 f2
 f
 V2

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Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 V²
 f
 V
 f²

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Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 V
 f
 V²
 f²

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