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DGVCL Exam Paper (11-12-2011)

DGVCL Exam Paper (11-12-2011)
The positive and negative sequence impedance of a transmission line are

Infinite
Equal
Different
Zero

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DGVCL Exam Paper (11-12-2011)
Permittivity is expressed in terms of

Weber /m
farad/sq. m.
Farad/m
N/m

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DGVCL Exam Paper (11-12-2011)
The mutual inductance between two unity coupled coils of 9 H and 4 H is

36 H
2.2 H
6 H
13 H

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DGVCL Exam Paper (11-12-2011)
Which type of back up protection is widely used for the protection of transmission lines?

Control backup
Breaker backup
Remote backup
Relay backup

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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 %
More than 90%
80 %
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)
The insulation coordination for UHV lines (above 500 kV) is done based on

Lightning and switching surges
Lightning surges
Voltage level of the line
Switching surges

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