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Power Systems - Interview Questions and Answers

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11. For a single phase overhead line having solid copper conductors of diameter 1 cm, spaced 60 cm between centers, the inductance in mH/km is
A. 0.05 + 0.2 ln 60
B. 0.2 ln 60
C. 0.05 + 0.2 ln (6010.5)
D. 0.2 ln (60/0.5)
Explanation:
12. For equilateral spacing of conductors of an untrasposed 3-phase line, we have
A. balanced receiving end voltage and no communication interference
B. unbalanced receiving end voltage and no communication interference
C. balanced receiving end voltage and communication interference
D. unbalanced receiving end voltage and communication interference.
Explanation:
13. The main consideration for higher and higher operating voltage of transmission is to
A. increase the efficiency of transmission
B. reduce power losses
C. increase power transmission capability
D. both (a) and (b) above
Explanation:
14. The load duration curve for a system, is shown in the figure below. The load factor will be
A. 0.83
B. 0.96
C. 0.67
D. 0.50
Explanation:
15. A medium line with parameters A, B, C, D is extended by connecting a short line of impedance Z in series The overall ABCD parameteres of the series combinatton will be
A. A, AZ, C + D/Z, D
B. A, AZ + B, C, CZ + D
C. A + BZ, B, C + DZ, D
D. AZ, B, C/Z, D
Explanation:
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