DGVCL Exam Paper (11-12-2011)
Two parallel conductors are carrying the current in the same direction. Which of the following statements is correct?

The force increases when the distance between the conductors is increased
There is a repelling force between the conductors
The force increases when the distance between the conductors is decreased
There is an attracting force between the conductors

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

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

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

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