DGVCL Exam Paper (11-12-2011)
In carrier current protection, the purpose of the wave trap is for

All of these
Trapping power frequency waves
Tripping fault current
Trapping high frequency waves entering into generator/transformer unit.

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

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DGVCL Exam Paper (11-12-2011)
A fuse wire should have

High specific resistance and high melting point
High specific resistance and low melting point
Low specific resistance and high melting point
Low specific resistance and low melting point

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