DGVCL Exam Paper (11-12-2011)
It is difficult interrupt a capacitive current because

The restriking voltage can be high
It has a leading power factor
Stored energy in the capacitor is very high
Current magnitude is very small

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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
Eliminate hunting and provide adequate starting torque
Reduce bearing friction
Reduce winding losses

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DGVCL Exam Paper (11-12-2011)
Buchholz relay causes

Alarm for both major and minor faults
Tripping for both major and minor faults
Tripping for major faults and alarm for minor faults
Tripping for minor faults and alarm for major faults

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

An inverse time current characteristic
A definite time cuttent 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

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