Electrical Machines
Which type motors are preferred for lathes?

 Either A or B.
 Synchronous motor.
 DC shunt motors.
 Squirrel Cage induction motor.

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Electrical Machines
In a loaded DC generator, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 deteriorate with rise in terminal voltage.
 improve with fall of terminal voltage.
 deteriorate with fall of terminal voltage.
 improve with rise in terminal voltage.

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Electrical Machines
A dc shunt generator, when commissioned after a major repair of the field system, failed to build Up voltage. It was because

 field system lost residual magnetism
 field winding was wrongly connected
 there was a break in the armature circuit
 field resistance was higher than critical resistance

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