DGVCL Exam Paper (11-12-2011)
If the excitation of a synchronous generator fails, it acts as a

Induction generator
Synchronous motor
Synchronous generator
Induction motor

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DGVCL Exam Paper (11-12-2011)
The corona effect can be minimized by increasing

Both spacing between the conductors and diameter of the conductor
Spacing between the conductors
Diameter of the conductor
The length of the conductor

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

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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)
The main advantage of using fractional pitch winding is to refuce

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

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