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Electrical Machines

Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 60°.
 30°.
 90°.
 120°.

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

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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will

 decrease
 increase gradually and then stay at rated voltage
 remain nearly constant
 increase to rated voltage and then may decrease

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Electrical Machines
A 4-pole DC generator runs at 1500 rpm. The frequency of current in the armature winding is:

 100 Hz.
 25 Hz.
 Zero Hz.
 50 Hz.

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Electrical Machines
The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce

 vibrations.
 copper loss.
 eddy electric current loss.
 hysteresis loss.

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Electrical Machines
If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field

 to earth.
  to a DC source.
 in reverse.
 to an AC source.

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