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

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DGVCL Exam Paper (11-12-2011)
An IDMT relay provides

A definite time characteristic for low values of the failt current and an inverse characteristic for high values of the fault current
An inverse time current characteristic
A definite time cuttent characteristic
An inverse characteristic for low values of the fault current and a definite time characteristic for high values of the fault current

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