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DGVCL Exam Paper (11-12-2011)

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
Extinguish
Restrike
Decrease in size

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DGVCL Exam Paper (11-12-2011)
At time t= 0+ , with zero initial condition, which of the following acts as a short circuit?

Conductor
Resistor
Capacitor
Voltage source

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

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

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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

90 %
80 %
More than 90%
Less than 90%

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Efficiency= output power/input power
efficiency = (v*i*cosφ)/((v*i*cosφ)+(x² Pc)+(Pi)) x=fractional part of full load

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

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

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DGVCL Exam Paper (11-12-2011)
What type of insulator is used if the direction of the transmission line is to be changed?

Suspebsion type
Strain type
Shakle type
Pin type

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