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DGVCL Exam Paper (11-12-2011)

DGVCL Exam Paper (11-12-2011)
If a relay fails to operate inspite of a fault in its own zone of protection, it is said to

Pick up
Under reach
Reach
Over reach

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DGVCL Exam Paper (11-12-2011)
If the percentage reactance of the system upto the point of fault is 20% and the base kVA is 10,000 the short ciruit kVA is

60 MVA
10 MVA
50 MVA
20 MVA

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Short circuit kVA = Base kVA/%X

DGVCL Exam Paper (11-12-2011)
An AC series circuit has R = 6 Ω, XL = 20 Ω and Xc = 12 Ω. The ciruit power factor will be

0.6 leading
0.8 lagging
0.6 lagging
0.5 leading

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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

217.8 MW
500 MW
435.6 MW
251.5 MW

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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

Firm power
Hot reserve
Spinning reserve
Cold reserve

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DGVCL Exam Paper (11-12-2011)
The effect of electric shock on the human body depends on

Duration of contact
All of these
Current
Voltage

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