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 circuit breaker-open isolator-close earthing switch
Open isolator close circuit breaker-open 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)
Buchholz relay causes

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

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DGVCL Exam Paper (11-12-2011)
A Mho relay is a

Voltage controlled over current relay
Directional restrained over current relay
Voltage restrained directional relay
Directional restrained over voltage relay

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