Power Systems Questions and Answers – Inductance of a Single-Phase Two-Wire Line – 2

This set of Power Systems Interview Questions and Answers focuses on “Inductance of a Single-Phase Two-Wire Line – 2”.

1. A 10 MVA, 11 kV alternators has positive, negative and zero sequence reactance of 25%, 40%, 10% respectively. The resistance that must be placed in the neutral such that zero sequence of fault current for a single phase to ground fault will not exceed the rated line current in pu is ______
a) 0.22
b) 0.11
c) 0.16
d) 0.97
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Answer: a
Explanation:

2. A 10 MVA, 11 kV alternator has positive, negative and zero sequence reactance of 25%, 40%, 10% respectively. The resistance that must be placed in the neutral such that fault current for a single phase to ground fault will not exceed the rated line current in pu is _____________
a) 0.97
b) 0.22
c) 0.87
d) 0.45
View Answer

Answer: a
Explanation:

3. A 10 MVA, 11 kV alternator has positive, negative and zero sequence reactance of 25%, 40%, 10% respectively. The resistance that must be placed in the neutral such that fault current for a single phase to ground fault will not exceed the rated line current in ohms is __________
a) 11.7
b) 12.8
c) 2.66
d) 5.2
View Answer

Answer: a
Explanation:

4. (I) Unsymmetrical spacing configurations cause the line interference.
(II) Unsymmetrical spacing causes the voltage induction in the communication lines.
a) (I) and (II) are valid
b) Only (I) is valid
c) Only (II) is valid
d) Both are invalid
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5. (I) Unsymmetrical spacing configurations cause the line interference.
(II) Unsymmetrical spacing causes the voltage induction in the communication lines.
The above problems can be eliminated by ________
a) transposition
b) parallel lines
c) three phase
d) all of the mentioned
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6.Transposition is the mean to balance ____________
a) Inductance
b) Voltage
c) Current
d) All of the mentioned
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7. Over the length of one transposition cycle of a power line, the total flux linkages of a nearby telephone line are zero for the unbalanced three phase currents.
a) True
b) False
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8. Over the length of one transposition cycle of a power line, the total flux linkages of a nearby telephone line are zero for the balanced three phase currents.
a) The above statement is valid
b) The above statement is invalid
c) It can’t be concluded
d) The above statement is valid for all conditions.
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Sanfoundry Global Education & Learning Series – Power Systems.

To practice all areas of Power Systems for Interviews, here is complete set of 1000+ Multiple Choice Questions and Answers.