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DGVCL Exam Paper (11-12-2011)

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

Shakle type
Pin type
Suspebsion type
Strain type

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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

13 H
6 H
36 H
2.2 H

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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

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

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

DGVCL Exam Paper (11-12-2011)
If the voltage at the two ends of a line are 132 kV, and its reactance is 40 Ω, the stability limit of the line is

500 MW
435.6 MW
251.5 MW
217.8 MW

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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 inverse of each other
Are the same

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DGVCL Exam Paper (11-12-2011)
Bulk power transmission over long HVDC lines are preferred on account of

Low cost of HVDC terminals
Simple protection
No harmonic problems
Minimum line power losses

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