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

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

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DGVCL Exam Paper (11-12-2011)
Hysteresis in an instrument means

The change in the same reading when the input is first increased and then decreased
The repeatability of the instrument
The reliability of the instrument
The inaccuracy due to change in temperature

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

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

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