DGVCL Exam Paper (11-12-2011)
It is difficult interrupt a capacitive current because

Current magnitude is very small
Stored energy in the capacitor is very high
It has a leading power factor
The restriking voltage can be high

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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 cross-magnetizing effect of armature mmf
The reactance voltage

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DGVCL Exam Paper (11-12-2011)
Buchholz relay causes

Tripping for both major and minor faults
Alarm for both major and minor faults
Tripping for major faults and alarm for minor faults
Tripping for minor faults and alarm for major faults

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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?

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

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