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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

Decrease in size
Increase in size
Restrike
Extinguish

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DGVCL Exam Paper (11-12-2011)
In a power plant, a reserve generating capacity which is not in service but is in operation is known as

Spinning reserve
Firm power
Hot reserve
Cold reserve

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DGVCL Exam Paper (11-12-2011)
Transposition of transmission line is done to

Reduce corona
Balance line voltage drop
Reduce skin effect
Reduce line loss

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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?

Voltage source
Resistor
Capacitor
Conductor

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DGVCL Exam Paper (11-12-2011)
Ybus used in power flow studies and Zbus used in short circuit studies

Are transpose of each other
Have no inter relation
Are the same
Are inverse of each other

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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

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

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

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

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