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

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

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

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

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DGVCL Exam Paper (11-12-2011)
The purpose of embedding the damper winding in the pole face of a synchronous motor is to

Reduce bearing friction
Reduce winding losses
Eliminate losses on account of fair friction
Eliminate hunting and provide adequate starting torque

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

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