DGVCL Exam Paper (11-12-2011)
An IDMT relay provides

An inverse characteristic for low values of the fault current and a definite time characteristic for high values of the fault current
An inverse time current characteristic
A definite time characteristic for low values of the failt current and an inverse characteristic for high values of the fault current
A definite time cuttent characteristic

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DGVCL Exam Paper (11-12-2011)
The advantage of slipring induction motor over the squirrel cage induction motor is

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

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

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

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