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

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

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

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

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DGVCL Exam Paper (11-12-2011)
The corona effect can be minimized by increasing

Both spacing between the conductors and diameter of the conductor
The length of the conductor
Spacing between the conductors
Diameter of the conductor

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