Power Systems Questions and Answers – Inductance of Composite Conductor Lines – 2

This set of Power Systems Questions and Answers for Freshers focuses on “Inductance of Composite Conductor Lines – 2”.

1. Based on the below given phasor diagram, the condition for the zero voltage regulation occurs at ______________

a) OC = OA
b) OC > OA
c) OC = OD
d) DC = AB
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2. In the below given phasor diagram representation, the angle sine(AOD) for the condition of zero voltage regulation will be given by ___________


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The below given phasor diagram is for question number 3, 4 and 5

3. In the phasor diagram representation, the angle (AOD) for the condition of zero voltage regulation will be given by _______________

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4. In the phasor diagram, the angle Ф_r such that zero voltage regulation occurs at the receiving end of a transmission line for a leading load, is given as __________

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Answer: a
Explanation: It is geometrically sin(AOD) = AD/OA = (AC/2)/|Vr|.

5. In the phasor diagram, the angle Ф_r such that zero voltage regulation occurs at the receiving end of a transmission line for a lagging load, is given as ___________

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Answer: b

6. For a transmission line under study of failure analysis, it is observed that the current at the receiving end is same as that of the sending end, then what can be concluded about the nature of the transmission line?
a) It is short TL
b) It is medium TL
c) It is long TL
d) Current is always same at the receiving end and the sending end.
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7. A single phase 50 hz, generator supplies an inductive load of 5 MW at a power factor of 0.8 lagging using OHTL over 20 km. The resistance and reactance are 0.39Ω and 3.96 Ω. The voltage at receiving station is maintained at 10 KV. The sending end voltage is ______
a) 11.68 kV
b) 7.62 kV
c) 14.4 kV
d) 12.2 kV
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8. When the frequency of the system is increased, the charging MVAR of a system will __________
a) increase
b) decrease
c) remain constant
d) cannot be said
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9.Taking a case study for the long line under no load condition, the receiving end voltage is ____________
a) more than the sending-end voltage
b) less than the sending-end voltage
c) equal to the sending-end voltage
d) it will not be affected by the loading
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10. While given receiving-end voltage for a long transmission line, the sending-end voltage is more than the actual is found out using _____________
a) Nominal-pi method
b) Nominal-T method
c) Load end capacitance method
d) Any of the mentioned
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Sanfoundry Global Education & Learning Series – Power Systems.

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