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
Eliminate losses on account of fair friction
Reduce winding losses

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

Portion of the conductor near the surface carries less current and the core of the conductor carries more current
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

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DGVCL Exam Paper (11-12-2011)
The purpose of skewing of rotor slots in an induction motor is

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

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