DGVCL Exam Paper (11-12-2011)
Two parallel conductors are carrying the current in the same direction. Which of the following statements is correct?

The force increases when the distance between the conductors is decreased
The force increases when the distance between the conductors is increased
There is an attracting force between the conductors
There is a repelling force between the conductors

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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 hunting and provide adequate starting torque
Eliminate losses on account of fair friction
Reduce bearing friction
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
Open circuit breaker-open isolator-close earthing switch
Close earthing switch - open ciruit- breaker-open islotor
Open isolator close circuit breaker-open earthing switch

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DGVCL Exam Paper (11-12-2011)
Due to skin effect

Portion of the conductor near the surface carries more current and the core of the conductor carries less current
Current flows through the half cross section of the conductor
Uniform current flows through the conductor
Portion of the conductor near the surface carries less current and the core of the conductor carries more current

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