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)
An IDMT relay provides

An inverse time current characteristic
An inverse characteristic for low values of the fault current and a definite time characteristic for high values of the fault current
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 main advantage of using fractional pitch winding is to refuce

Harmonics in the generated emf
Size of the machine
Cost of the machine
Amount of copper in the winding

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

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