DGVCL Exam Paper (11-12-2011)
The form factor in AC means the ration of

Peak value to r.m.s value
R.M.S. value to peak value
Peak value to average value
R.M.S. value to average value

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

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

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

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