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DGVCL Exam Paper (11-12-2011)

DGVCL Exam Paper (11-12-2011)
A device connected to the computer which converts digital signals to analog and vice-versa is

Modem
Keyboard
CPU
UPS

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DGVCL Exam Paper (11-12-2011)
The form factor in AC means the ration of

R.M.S. value to peak value
Peak value to average value
R.M.S. value to average value
Peak value to r.m.s value

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DGVCL Exam Paper (11-12-2011)
A fixed step by step procedure for finding the solution of a problem on computer is called

Software
Algorithm
Hardware
Logic

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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
Lightning
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)
Bulk power transmission over long HVDC lines are preferred on account of

Simple protection
Low cost of HVDC terminals
Minimum line power losses
No harmonic problems

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

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

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