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Electrical Machines

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

 f
 V²
 V
 f²

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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?

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

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Electrical Machines
stepped cores are used in transformers in order to reduce

 volume of copper.
 iron loss.
 volume of iron.
 reluctance of core.

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Electrical Machines
What will be the e.m.f. generated by a 4 pole lap connected DC Generator rotating at 1500 r.p.m.? Its flux per pole is 0.4 mWb and total no of armature conductors is 1000.

 10 volts.
 20 volts.
 40 volts.
 30 volts.

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Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 50
 1
 10
 100

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Electrical Machines
Which of the following will vary the maximum torque?

 rotor reactance X
None of these
 rotor resistance R
 both 1 and 2

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