DGVCL Exam Paper (11-12-2011)
The purpose of skewing of rotor slots in an induction motor is

To reduce the locking tendency of the rotor
To increase the distributuion factor
To increase the breadth factor
To reduce the magnetic hum of the motor

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DGVCL Exam Paper (11-12-2011)
The purpose of interpoles in DC machines is to nullify

The cross-magnetizing effect of armature mmf
Both the cross-magnetizing mmf and the reactance voltage
The demagnetizing effect of armature mmf
The reactance voltage

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DGVCL Exam Paper (11-12-2011)
Distribution transformers have good all day efficiency due to

Low copper loss
Low iron loss
Low copper as well as iron loss
Low voltage

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