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Electrical Machines

Electrical Machines
Open circuit test on transformer gives

 hysteresis loss
 copper loss
 both 1and 2
 eddy current loss

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Electrical Machines
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

 less than 6 V
 6 V
 more than 6 V
 zero

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

 50 Hz.
 100 Hz.
 Zero Hz.
 25 Hz.

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Electrical Machines
The crawling in the induction motor is caused by

 high loads
 low voltage supply
 improper design of stator laminations
 harmonics developed in the motor

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Electrical Machines
There are two 2-pole DC machines. Main field axis of machine A is horizontal and that of B is vertical. It is preferable to purchase

 none of these
 machine B
 any of the two machines
 machine A

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Electrical Machines
Which of the following are variable losses?

 shunt field copper loss
 armature copper loss
 eddy current loss
 hysteresis loss

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