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Electrical Machines

Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 36 W.
 28 W.
 30 W.
 25 W.

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Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 4 and 2
 2 and 2
 2 and 1
 4 ang 1

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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 size of inter poles is small as compared to main poles. What is the reason?

All of these
 In order to get saturated.
 In order to get more flux.
 In order to not to get saturated.

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Electrical Machines
Hopkinson test is conducted under which of the following condition?

 any of the above
 half load
 no load
 full load

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Electrical Machines
Iron losses in a DC machine are independent of variation in

 speed.
  speed and voltage.
  load.
  voltage.

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