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

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

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

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

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