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 cross-magnetizing effect of armature mmf
The demagnetizing effect of armature mmf
The reactance voltage

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DGVCL Exam Paper (11-12-2011)
Which of the following correctly represents the sequence of operations of isolator, circiut breaker and earthing switch while opening a circuit?

Open isolator close circuit breaker-open earthing switch
Open circuit breaker-open isolator-close earthing switch
Close earthing switch - open ciruit- breaker-open islotor
Close circuit breaker-close isolator - open earthing switch

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

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

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

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

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