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

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DGVCL Exam Paper (11-12-2011)
Which of the following correctly represents the sequence of operations of isolator, circiut breaker and earthing switch while opening a circuit?

Close circuit breaker-close isolator - open earthing switch
Close earthing switch - open ciruit- breaker-open islotor
Open circuit breaker-open isolator-close earthing switch
Open isolator close circuit breaker-open earthing switch

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DGVCL Exam Paper (11-12-2011)
The purpose of skewing of rotor slots in an induction motor is

To increase the breadth factor
To increase the distributuion factor
To reduce the locking tendency of the rotor
To reduce the magnetic hum of the motor

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