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

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DGVCL Exam Paper (11-12-2011)
Two parallel conductors are carrying the current in the same direction. Which of the following statements is correct?

The force increases when the distance between the conductors is increased
There is a repelling force between the conductors
The force increases when the distance between the conductors is decreased
There is an attracting force between the conductors

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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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