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

Low iron loss
Low copper 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 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
A definite time cuttent characteristic

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DGVCL Exam Paper (11-12-2011)
The motor used in celling fans is

Split phase motor
Capacitor start motor
Universal motor
Capacitor start capacitor run motor

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