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

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

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DGVCL Exam Paper (11-12-2011)
Distribution transformers have good all day efficiency due to

Low voltage
Low copper loss
Low iron loss
Low copper as well as iron loss

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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?

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

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