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Power Systems - Interview Questions and Answers

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46. A voltage of 1000 kV is applied to an overhead line with its receiving end open. If the surge impedance of the line is 500 ohm, then the total surge power in the line ill
A. 2000 MW
B. 500 MW
C. 2 MW
D. 0.5 MW
Explanation:
47. A lossless radial tranemission line with surge impedance loading
A. takes negative VAr at sending end and zero VAr at receiving end
B. takes positive VAr at sending end and zero VAr at receiving end
C. has flat voltage profile and unity power factor at all points along it
D. has sending end voltage higher than receiving end voltage and unity power factor at sending end
Explanation:
48. The corona loss on a particular system at 50 Hz is 1 kw/phase per km. The corona loss on the same system with supply frequency 25 Hz will be
A. 1 kW/phase/km
B. 0.5 kW/phase/km
C. 0.667 kW/phase/km
D. none of the above
Explanation:
49. A 60 Hz, 320 km loesless line has Bending end voltage 1.0 p.u, The receiving end voltage on no load is
A. 1.1 p.u.
B. 1.088 p.u.
C. 1.116 p.u.
D. none of the above
Explanation:
50. The order of the sub-harmonic during SSR for 50 Hz nornal frequency is
A. 25 Hz
B. 16 2/3 Hz
C. 10 HZ
D. none of the above
Explanation:
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