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DGVCL Exam Paper (11-12-2011)

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

Voltage source
Conductor
Resistor
Capacitor

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DGVCL Exam Paper (11-12-2011)
The transient stability of a power system can be improved by

Phase shifting transformer
Single pole switching of circuit breakers
Increasing the turbine valve opening
Excitation control

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DGVCL Exam Paper (11-12-2011)
Which lightning stroke is most dangerous?

Indirect stroke on conductor
Direct stroke on ground wire
Direct stroke on line conductor
Direct stoke on tower top

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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
10 MVA
20 MVA
60 MVA

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Short circuit kVA = Base kVA/%X

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

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

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DGVCL Exam Paper (11-12-2011)
The purpose of providing a choke in a tube light is

To eliminate corona effect
To improve the power factor
To avoid radio interference
To limit the current to an appropriate value

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