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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
Resistor
Conductor
Capacitor

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DGVCL Exam Paper (11-12-2011)
People can interact with each other through any part of the world through video conferencing using

Webcam
Joystick
Speaker
Scanner

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DGVCL Exam Paper (11-12-2011)
In the protection of transformers, harmonic restraint is used to guard against

Switching over voltages
Magnetizing inrush current
Unbalanced protection
Lightning

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Initial inrush of magnetizing currents have high component of even and odd harmonics.
2nd - 63%
3rd -26.8%
4th- 5.1%
5th- 4.1%
6th- 3.7
7th-2.4

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

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

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DGVCL Exam Paper (11-12-2011)
Reactance relay is used to protect against

Phase faults only
Over voltage faults
Both phase and earth faults
Earth faults only

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

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

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