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

Low iron loss
Low voltage
Low copper as well as iron loss
Low copper 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 isolator close circuit breaker-open earthing switch
Open circuit breaker-open isolator-close earthing switch
Close circuit breaker-close isolator - open earthing switch

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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)
Hysteresis in an instrument means

The repeatability of the instrument
The change in the same reading when the input is first increased and then decreased
The inaccuracy due to change in temperature
The reliability of the instrument

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