DGVCL Exam Paper (11-12-2011)
The insulation coordination for UHV lines (above 500 kV) is done based on

Switching surges
Voltage level of the line
Lightning and switching surges
Lightning surges

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

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