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DGVCL Exam Paper (11-12-2011)

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

0.5 leading
0.6 leading
0.6 lagging
0.8 lagging

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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
36 H
2.2 H
6 H

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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?

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

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

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

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DGVCL Exam Paper (11-12-2011)
At time t= 0+ , with zero initial condition, which of the following acts as a short circuit?

Capacitor
Voltage source
Resistor
Conductor

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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 %
More than 90%
Less than 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

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