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

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DGVCL Exam Paper (11-12-2011)
The main advantage of using fractional pitch winding is to refuce

Size of the machine
Harmonics in the generated emf
Amount of copper in the winding
Cost of the machine

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DGVCL Exam Paper (11-12-2011)
Buchholz relay causes

Tripping for major faults and alarm for minor faults
Tripping for both major and minor faults
Alarm for both major and minor faults
Tripping for minor faults and alarm for major faults

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

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

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

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