# FACTS Questions and Answers – AC Transmission Interconnections – Set 2

This set of FACTS Multiple Choice Questions & Answers (MCQs) focuses on “AC Transmission Interconnections – Set 2”.

1. The inductance of a transmission line is measured in ________
a) henry/metre
b) coloumb/metre
d) ampere/metre

Explanation: The inductance of a transmission line is measured in henry/metre. Coloumb is the unit of charge. Farad is the unit of capacitance. Ampere is the unit of current.

2. The resistance of a transmission line is measured in ________
a) henry/metre
b) ohm/metre
d) ampere/metre

Explanation: The resistance of a transmission line is measured in ohm/metre. Farad is the unit of capacitance. Ampere is the unit of current. Henry is the unit of inductance.

3. The capacitance of a transmission line is measured in ________
a) henry/metre
b) coloumb/metre
d) ampere/metre

Explanation: The capacitance of a transmission line is measured in farad/metre. Ampere is the unit of current.Coloumb is the unit of charge. Henry is the unit of inductance.

4. What is the type of an electrical power transmission system?
a) distributed
b) lumped
c) lumped or distributed
d) unknown

Explanation: The electrical power transmission system is basically a distributed system of network. This is because the inductance and capacitance of transmission lines are distributed throughout their lengths. The inductance or capacitance of the total transmission line exhibits transit time effect and, therefore, cannot be considered to be separable from each other. So they cannot be lumped at a particular point in space and hence, it cannot be considered as a lumped network.

5. Can Kirchoff’s laws be applied to transmission system as a whole?
a) Yes, always
b) Never
c) May or may not be
d) Not known

Explanation: Kirchoff’s laws CANNOT be applied to a transmission system as a whole. None of the Kirchoff’s laws can be applied to distributed networks as it has its own limit of application to only lumped networks. An electrical power transmission system, as a whole, is a distributed one and hence their inductance and capacitance cannot be assumed to be of lumped nature due to its characteristic transit time effect.

6. In AC transmission interconnection capacitance and inductance are considered as ________
a) distributed parameters
b) lumped parameters
c) distributed or lumped parameters
d) zero

Explanation: In AC transmission interconnection capacitance and inductance are considered as the ‘ Distributed Parameters’ of the line. The underlying reason is that the inductance and capacitance of transmission lines are distributed throughout their lengths. By virtue of its inherent transit time effect the whole transmission line does not allow inductance or capacitance to get lumped at a particular point in space for calculation purposes and hence, it cannot be considered as a lumped network.

7. The leakage conductance of a transmission line is measured in ________
a) ohm/metre
b) coloumb/metre
c) mho/metre
d) ampere/metre

Explanation: The leakage conductance of a transmission line is measured in mho/metre. Ampere is the unit of current. Coloumb is the unit of charge. Ohm is the unit of resistance.

8. The distributed parameters of AC transmission interconnections are defined in per ________ of the line.
a) unit length
b) unit volume
c) unit surface area
d) unit conduction area

Explanation: The distributed parameters of AC transmission interconnections are defined in per unit length of the line. The leakage conductance of a transmission line is measured in mho/metre. The capacitance of a transmission line is measured in farad/metre.

9. For the analysis of the transmission system the lumped circuit model can be applied _______
a) always
b) never
c) for small section of the line of length limiting to zero
d) when desired

Explanation: For the analysis of the transmission system to be valid for all frequencies, the lumped circuit model can be applied for any small section of the transmission line of length limiting to zero. Under such conditions, Kirchoff’s laws can be applied for any small section of the transmission line of length limiting to zero. As a whole the electrical power transmission system is basically a distributed system of network because of its distributed parameters.

10. For the analysis of the transmission system, Kirchoff’s laws are applied to ________ of a transmission line.
a) an infinitesimal section
b) whole length
c) a small or total length
d) the end or the beginning

Explanation: For the analysis of the transmission system to be valid for all frequencies, the lumped circuit model can be applied for any infinitesimal section of the transmission line of length limiting to zero. Therefore, for this infinitesimal section, Kirchoff’s laws can be applied. When considered as a whole, the electrical power transmission system is basically a distributed system of network because of its distributed parameters; and Kirchoff’s laws cannot be applied.

Sanfoundry Global Education & Learning Series – Flexible AC Transmission System (FACTS).

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