DGVCL Exam Paper (11-12-2011)
An over excited synchronous motor draws current at

Leading power factor
Unity power factor
Depends on nature of load
Lagging power factor

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

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

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