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DGVCL Exam Paper (11-12-2011)

DGVCL Exam Paper (11-12-2011)
Transposition of transmission line is done to

Reduce skin effect
Reduce corona
Balance line voltage drop
Reduce line loss

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DGVCL Exam Paper (11-12-2011)
Which type of back up protection is widely used for the protection of transmission lines?

Control backup
Relay backup
Remote backup
Breaker backup

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DGVCL Exam Paper (11-12-2011)
The best location of the power factor correction equipment to be installed in the transmission line is at

Middle of the line
Any place
The sending end
The receiving end

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

Lightning
Magnetizing inrush current
Switching over voltages
Unbalanced protection

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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)
In a series RLC circuit at resonance

Current is maximum and power factor is unity
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

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DGVCL Exam Paper (11-12-2011)
Different computers are connected to a LAN by a cable and a

Interface card
Telephone line
Special wires
Modem

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MORE MCQ ON DGVCL Exam Paper (11-12-2011)

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