DGVCL Exam Paper (11-12-2011)
The purpose of embedding the damper winding in the pole face of a synchronous motor is to

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

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

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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 increase the distributuion factor
To reduce the magnetic hum of the motor

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