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

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

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

Diameter of the conductor
The length 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)
The advantage of slipring induction motor over the squirrel cage induction motor is

It has a higher efficiency
It's power factor is higher
It can be started with the help of rotor resistances
It is suitable for higher speeds

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