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

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

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DGVCL Exam Paper (11-12-2011)
Due to skin effect

Portion of the conductor near the surface carries less current and the core of the conductor carries more current
Portion of the conductor near the surface carries more current and the core of the conductor carries less current
Current flows through the half cross section of the conductor
Uniform current flows through the conductor

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