DGVCL Exam Paper (11-12-2011)
The insulation coordination for UHV lines (above 500 kV) is done based on

Voltage level of the line
Switching surges
Lightning surges
Lightning and switching surges

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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
The length of the conductor
Spacing between the conductors
Diameter of the conductor

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DGVCL Exam Paper (11-12-2011)
A Mho relay is a

Directional restrained over voltage relay
Voltage controlled over current relay
Directional restrained over current relay
Voltage restrained directional relay

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