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

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

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DGVCL Exam Paper (11-12-2011)
Distribution transformers have good all day efficiency due to

Low iron loss
Low copper as well as iron loss
Low copper loss
Low voltage

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

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