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DGVCL Exam Paper (11-12-2011)

DGVCL Exam Paper (11-12-2011)
The main criterion for the design of a distributor is

Voltage drop
Corona loss
Radio interference
Temperature rise

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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)
Transposition of transmission line is done to

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

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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

6 H
13 H
2.2 H
36 H

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DGVCL Exam Paper (11-12-2011)
An over excited synchronous motor draws current at

Unity power factor
Lagging power factor
Leading power factor
Depends on nature of load

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Over excitation : leading current
Under excitation : lagging current
Normal excitation : current with unity PF (in phase current)

DGVCL Exam Paper (11-12-2011)
In a series RLC circuit at resonance

Current is maximum and power factor is 0.5
Current is maximum and power factor is unity
Current is minimum and power factor is unity
Current is minimum and power factor is 0.5

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