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

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

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

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

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

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