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Electrical Machines

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

 120°.
 60°.
 90°.
 30°.

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

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

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Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 torque.
 power.
 speed.
 current.

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Electrical Machines
In above question, the output power delivered by generator G1 and G2 will be

  6.3 kW, 9.3 kW.
 9.6 kW, 12 kW.
 5.7 kW, 8.7 kW.
 9.3 kW, 9.3 kW.

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Electrical Machines
Which of the following are variable losses?

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

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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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