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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DGVCL Exam Paper (11-12-2011)
The advantage of slipring induction motor over the squirrel cage induction motor is

It can be started with the help of rotor resistances
It is suitable for higher speeds
It has a higher efficiency
It's power factor is higher

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DGVCL Exam Paper (11-12-2011)
Due to skin effect

Uniform current flows through the conductor
Portion of the conductor near the surface carries more current and the core of the conductor carries less current
Current flows through the half cross section of the conductor
Portion of the conductor near the surface carries less current and the core of the conductor carries more current

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

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

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