DGVCL Exam Paper (11-12-2011)
In the protection of transformers, harmonic restraint is used to guard against

Lightning
Unbalanced protection
Switching over voltages
Magnetizing inrush current

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DGVCL Exam Paper (11-12-2011)
The purpose of interpoles in DC machines is to nullify

Both the cross-magnetizing mmf and the reactance voltage
The reactance voltage
The cross-magnetizing effect of armature mmf
The demagnetizing effect of armature mmf

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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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DGVCL Exam Paper (11-12-2011)
The motor used in celling fans is

Split phase motor
Universal motor
Capacitor start motor
Capacitor start capacitor run motor

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

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

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