DGVCL Exam Paper (11-12-2011)
The advantage of slipring induction motor over the squirrel cage induction motor is

It is suitable for higher speeds
It has a higher efficiency
It's power factor is higher
It can be started with the help of rotor resistances

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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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