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 is suitable for higher speeds
It can be started with the help of rotor resistances

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

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

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DGVCL Exam Paper (11-12-2011)
Due to skin effect

Current flows through the half cross section of the conductor
Uniform current flows through the conductor
Portion of the conductor near the surface carries more current and the core of the conductor carries less current
Portion of the conductor near the surface carries less current and the core of the conductor carries more current

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

The reliability of the instrument
The repeatability 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

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