DGVCL Exam Paper (11-12-2011)
Under operating conditions, the secondary of a current transformer is always short ciruited because

It protects the primary ciruits
It is safe to human beings
It protects the secondary ciruits
It avoids core saturation and high voltage induction

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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

Reduce bearing friction
Eliminate hunting and provide adequate starting torque
Reduce winding losses
Eliminate losses on account of fair friction

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

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

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