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

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

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