DGVCL Exam Paper (11-12-2011)
In the protection of transformers, harmonic restraint is used to guard against

Magnetizing inrush current
Lightning
Switching over voltages
Unbalanced protection

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DGVCL Exam Paper (11-12-2011)
The purpose of embedding the damper winding in the pole face of a synchronous motor is to

Eliminate hunting and provide adequate starting torque
Eliminate losses on account of fair friction
Reduce winding losses
Reduce bearing friction

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DGVCL Exam Paper (11-12-2011)
Distribution transformers have good all day efficiency due to

Low copper loss
Low voltage
Low copper as well as iron loss
Low iron loss

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

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