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

An inverse characteristic for low values of the fault current and a definite time characteristic for high values of the fault current
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 time current characteristic

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DGVCL Exam Paper (11-12-2011)
A Mho relay is a

Voltage restrained directional relay
Voltage controlled over current relay
Directional restrained over current relay
Directional restrained over voltage relay

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

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

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DGVCL Exam Paper (11-12-2011)
Buchholz relay causes

Tripping for minor faults and alarm for major faults
Tripping for both major and minor faults
Tripping for major faults and alarm for minor faults
Alarm for both major and minor faults

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