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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

Under reach
Over reach
Reach
Pick up

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DGVCL Exam Paper (11-12-2011)
It is difficult interrupt a capacitive current because

Current magnitude is very small
The restriking voltage can be high
Stored energy in the capacitor is very high
It has a leading power factor

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

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

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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?

Voltage source
Conductor
Resistor
Capacitor

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

Magnetizing inrush current
Switching over voltages
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)
What happens to the contents of RAM (Random Access Memory) when the power of the computer is turned off?

Content is lost
Content gets corrupted
Content remains intact
Content is transferred to other memory

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