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
Reduce winding losses
Eliminate losses on account of fair friction
Reduce bearing friction

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DGVCL Exam Paper (11-12-2011)
The corona effect can be minimized by increasing

Both spacing between the conductors and diameter of the conductor
The length of the conductor
Spacing between the conductors
Diameter of the conductor

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DGVCL Exam Paper (11-12-2011)
The main advantage of using fractional pitch winding is to refuce

Size of the machine
Amount of copper in the winding
Harmonics in the generated emf
Cost of the machine

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