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

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

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DGVCL Exam Paper (11-12-2011)
The main advantage of using fractional pitch winding is to refuce

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

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

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

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