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)
Hysteresis in an instrument means

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

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

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

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DGVCL Exam Paper (11-12-2011)
The purpose of embedding the damper winding in the pole face of a synchronous motor is to

Eliminate losses on account of fair friction
Reduce winding losses
Eliminate hunting and provide adequate starting torque
Reduce bearing friction

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