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DGVCL EXAM PAPER (11-12-2011)

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

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

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DGVCL Exam Paper (11-12-2011)
Rated making capacity of a ciruit breaker is equal to

1.11 X rated symmetrical breaking capacity
2.55 X rated symmetrical breaking capacity
Rated symmetrical breaking capacity
√2 X rated symmetrical breaking capacity

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DGVCL Exam Paper (11-12-2011)
The bus bar zone faults are generally

Three phase short ciruits
Double line to ground faults
Phase to phase faults
Single line to ground faults

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

Temperature rise
Corona loss
Radio interference
Voltage drop

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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)

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