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DGVCL Exam Paper (11-12-2011)

DGVCL Exam Paper (11-12-2011)
The main criterion for the design of a distributor is

Temperature rise
Radio interference
Voltage drop
Corona loss

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DGVCL Exam Paper (11-12-2011)
If the dielectric strength of the medium between the contacts builds up more rapidly than the restriking voltage the arc will

Increase in size
Extinguish
Restrike
Decrease in size

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DGVCL Exam Paper (11-12-2011)
The picture on the monitor of a computer is made up of tiny coloured dots called

Points
Icons
Pixels
Spots

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DGVCL Exam Paper (11-12-2011)
Ybus used in power flow studies and Zbus used in short circuit studies

Are transpose of each other
Have no inter relation
Are the same
Are inverse of each other

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

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

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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

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