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

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DGVCL Exam Paper (11-12-2011)
The purpose of embedding the damper winding in the pole face of a synchronous motor is to

Reduce bearing friction
Reduce winding losses
Eliminate hunting and provide adequate starting torque
Eliminate losses on account of fair friction

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

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

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

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

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