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DGVCL Exam Paper (11-12-2011)

DGVCL Exam Paper (11-12-2011)
In a power plant, a reserve generating capacity which is not in service but is in operation is known as

Spinning reserve
Hot reserve
Firm power
Cold reserve

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DGVCL Exam Paper (11-12-2011)
First zone distance relay protects the transmission line section upto

Its full length
25 % of its full length
80 % of its full length
50 % of its full length

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

Lightning
Unbalanced protection
Switching over voltages
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)
Permittivity is expressed in terms of

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

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

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DGVCL Exam Paper (11-12-2011)
If the voltage at the two ends of a line are 132 kV, and its reactance is 40 Ω, the stability limit of the line is

435.6 MW
217.8 MW
251.5 MW
500 MW

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