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DGVCL Exam Paper (11-12-2011)

DGVCL Exam Paper (11-12-2011)
The positive and negative sequence impedance of a transmission line are

Equal
Different
Zero
Infinite

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DGVCL Exam Paper (11-12-2011)
The circuit breaker generally used in railway traction is

Vacuum CB
Air break CB
Bulk Oil CB
Minimum Oil CB

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

Keyboard
Modem
UPS
CPU

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DGVCL Exam Paper (11-12-2011)
What type of insulator is used if the direction of the transmission line is to be changed?

Strain type
Suspebsion type
Pin type
Shakle type

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

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

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

Unbalanced protection
Switching over voltages
Lightning
Magnetizing inrush current

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

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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