DGVCL Exam Paper (11-12-2011)
In the protection of transformers, harmonic restraint is used to guard against

Lightning
Magnetizing inrush current
Switching over voltages
Unbalanced protection

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

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

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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
Reduce winding losses
Eliminate hunting and provide adequate starting torque
Reduce bearing friction

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