DGVCL Exam Paper (11-12-2011)
The efficiency of a transformer at full load, 0.8 p.f. lag is 90%. Its efficiency at full load, 0.8 p.f. lead will be

Less than 90%
90 %
80 %
More than 90%

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

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

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

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

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