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

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

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DGVCL Exam Paper (11-12-2011)
DC series motors are best suited for traction work because

Torque and speed are inversely proportional to the square of the armature current
Torque and speed are proportional to the square of the armature current
Its torque is proportional to the square of the armature current and speed is directional proporational to torque
Its torque is proportional to the square of the armature current and speed is inversely proportional to torque

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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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