Power Systems Questions and Answers – Symmetrical Component Transformation – 1

This set of Power Systems Multiple Choice Questions & Answers (MCQs) focuses on “Symmetrical Component Transformation – 1”.

1. The receiving end active power for a short transmission line is (where the angles have their usual meanings)

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Answer: a
Explanation: Receiving end active power for a short transmission line is

2. The receiving end reactive power for a short transmission line is (where the angles have their usual meanings)

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Answer: c
Explanation: Receiving end reactive power for a short transmission line is

3. The sending end active power for a 20 km transmission line with Vs as the sending end voltage and Vr as receiving end voltage, can be given by most appropriately

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Answer: a
Explanation: The sending end active power is

4. The sending end reactive power for a 20 km transmission line with Vs as the sending end voltage and Vr as receiving end voltage, can be given by most appropriately

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Answer: d
Explanation: The sending end reactive power is

5. The simplified ABCD representation of a 40 km transmission line is best given as

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Answer: a
Explanation: From the given length, it is a short TL. Hence,

6. For a 35 km transmission line having a lumped impedance of the line as 20 ohms, is required to be shown in the ABCD form, it is given as

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Answer: a
Explanation: From the given length, it is a short TL. Hence,

7. If it is tried to represent the active and reactive power on a circle, then the radius would be

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Answer: a
Explanation:

8. The maximum power delivered to the load for short transmission line is at
a) β=α
b) β>α
c) β=δ
d) β>δ
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9. The maximum real active power delivered to the load is defined most accurately by

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Answer: a
Explanation: The maximum real active power delivered to the load is

10. For a given power system, its zero and maximum regulation will occur at the impedance angle of
a) 45
b) 90
c) 0
d) 60
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11. The charging currents due to shunt admittance can be neglected for ______ transmission line?
a) short
b) long
c) medium
d) all of the mentioned
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12. The transmission line equations are given by the below set of equations based on the line diagram as given. Identify the missing term marked as ’?’.
V_s = ?*V_r+B*I_r
I_s = C*V_r+D*I_r

a) 1+YZ
b) Z
c) Y
d) 1
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13. The transmission line equations are given by the below set of equations based on the line diagram as given. Identify the missing term marked as ’?’.
V_s = A*V_r+?*I_r
I_s = C*V_r+D*I_r

a) 1+YZ
b) Z
c) Y
d) 1
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14. The transmission line equations are given by the below set of equations based on the line diagram as given. Identify the missing term marked as ’?’.
V_s = A*V_r+B*I_r
I_s = ?*V_r+D*I_r

a) 1+YZ
b) Z
c) Y
d) 1
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15. The transmission line equations are given by the below set of equations based on the line diagram as given. Identify the missing term marked as ’?’.
V_s = A*V_r+B*I_r
I_s = C*V_r+?*I_r

a) 1+YZ
b) Z
c) Y
d) 1
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Sanfoundry Global Education & Learning Series – Power Systems.

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