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DGVCL EXAM PAPER (11-12-2011)

DGVCL Exam Paper (11-12-2011)
Reactance relay is used to protect against

Phase faults only
Earth faults only
Over voltage faults
Both phase and earth faults

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DGVCL Exam Paper (11-12-2011)
It is difficult interrupt a capacitive current because

The restriking voltage can be high
It has a leading power factor
Current magnitude is very small
Stored energy in the capacitor is very high

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DGVCL Exam Paper (11-12-2011)
The transient stability of a power system can be improved by

Increasing the turbine valve opening
Excitation control
Phase shifting transformer
Single pole switching of circuit breakers

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DGVCL Exam Paper (11-12-2011)
If the dielectric strength of the medium between the contacts builds up more rapidly than the restriking voltage the arc will

Increase in size
Decrease in size
Extinguish
Restrike

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DGVCL Exam Paper (11-12-2011)
First zone distance relay protects the transmission line section upto

25 % of its full length
50 % of its full length
Its full length
80 % of its full length

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