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DGVCL Exam Paper (11-12-2011)

DGVCL Exam Paper (11-12-2011)
A fuse is inserted in

Phase wire
Both phased and neutral wire
Neutral wire
Earth continuity conductor

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DGVCL Exam Paper (11-12-2011)
All the peripheral devices connected to a computer require power to work. Which of the following voltages is required for the motherboard to work?

AC
Positive cycle of sine wave
DC
Negative cycle of sine wave

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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 %
90 %
Less than 90%
More 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 effect of electric shock on the human body depends on

Voltage
All of these
Current
Duration of contact

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DGVCL Exam Paper (11-12-2011)
The insulation coordination for UHV lines (above 500 kV) is done based on

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

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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

50 MVA
20 MVA
10 MVA
60 MVA

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Short circuit kVA = Base kVA/%X

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