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

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

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

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