DGVCL Exam Paper (11-12-2011)
The motor used in celling fans is

Split phase motor
Capacitor start motor
Universal motor
Capacitor start capacitor run motor

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

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

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

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

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

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