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DGVCL Exam Paper (11-12-2011)

DGVCL Exam Paper (11-12-2011)
Permittivity is expressed in terms of

Weber /m
N/m
Farad/m
farad/sq. m.

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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
Modem
Special wires

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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
Lightning
Unbalanced protection
Magnetizing inrush current

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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)
Fot fast load flow calculations, the best method is

De-coupled method
Gauss-Siedal
Approximate method
Newton-Raphson

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

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

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DGVCL Exam Paper (11-12-2011)
The mutual inductance between two unity coupled coils of 9 H and 4 H is

36 H
6 H
13 H
2.2 H

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

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