DGVCL Exam Paper (11-12-2011)
In carrier current protection, the purpose of the wave trap is for

Tripping fault current
Trapping power frequency waves
All of these
Trapping high frequency waves entering into generator/transformer unit.

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

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

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

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

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

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

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