DGVCL Exam Paper (11-12-2011)
Ybus used in power flow studies and Zbus used in short circuit studies

Are the same
Are inverse of each other
Have no inter relation
Are transpose of each other

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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?

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

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

An inverse time current characteristic
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
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)
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
Close circuit breaker-close isolator - open earthing switch
Open isolator close circuit breaker-open earthing switch

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