DGVCL Exam Paper (11-12-2011)
Bulk power transmission over long HVDC lines are preferred on account of

No harmonic problems
Low cost of HVDC terminals
Minimum line power losses
Simple protection

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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 purpose of skewing of rotor slots in an induction motor is

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

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

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