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%
80 %
90 %
Less than 90%

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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 voltage
Low copper as well as iron loss

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DGVCL Exam Paper (11-12-2011)
An IDMT relay provides

A definite time cuttent characteristic
A definite time characteristic for low values of the failt current and an inverse characteristic for high values of the fault current
An inverse characteristic for low values of the fault current and a definite time characteristic for high values of the fault current
An inverse time current characteristic

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