# FACTS Devices Questions and Answers

This set of FACTS Multiple Choice Questions & Answers (MCQs) focuses on “FACTS Devices”.

1. In Electrical Engineering, FACTS is the abbreviation of ________
a) Flexible AC Transmission System
b) Flexible AC Transposition System
c) Fictitious AC Transmission System
d) Flexible AC Transduction System

Explanation: In Electrical Engineering, FACTS is the abbreviation of Flexible AC Transmission System or Flexible Alternating Current Transmission System. This scheme aims at providing control over the system parameters of one or more AC transmission system, thereby enhancing controllability and increasing power transfer capability of the network.

2. The transmission line impedance governs the transmitted reactive power through transmission power system.
a) True
b) False

Explanation: The transmission line impedance governs the transmitted reactive power through transmission power system. The transmission line impedance also governs the transmitted active power through transmission power system. The calculation of transmission line impedance is needed during design calculations for FACTS devices.

3. The phase angle between sending-end and receiving-end voltages influences the transmitted reactive power through transmission power system.
a) True
b) False

Explanation: The phase angle between sending-end and receiving-end voltages influences the transmitted reactive power through transmission power system. The phase angle between sending-end and receiving-end voltages also does influence the transmitted active power through transmission power system. The calculation of phase angle between sending-end and receiving-end voltages is needed during design calculations for FACTS devices.

4. The magnitude of ________ controls the transmitted reactive power through transmission power system.
a) both sending-end and receiving-end voltages
b) sending-end voltage
c) receiving-end voltage
d) neither sending-end nor receiving-end voltages

Explanation: The magnitude of both sending-end and receiving-end voltages controls the transmitted reactive power through transmission power system. These also govern the transmitted active power through transmission power system. The calculation of magnitude of both sending-end and receiving-end voltages is needed during design calculations for FACTS devices.

5. Z-parameters in 2port network are known as ________
a) short circuit impedance parameters
c) open circuit impedance parameters

Explanation: Z-parameters in 2port network are known as short circuit impedance parameters. There are four z-parameters. They are found by short circuiting either the input port or output port of 2port network.

6. Y-parameters in 2port network are known as ________
a) short circuit impedance parameters
c) open circuit impedance parameters

Explanation: Y-parameters in 2port network are known as open circuit admittance parameters. There are four y-parameters. They are found by open-circuiting either the input port or output port of 2port network.

7. Input impedance of a two-port network system cannot be characterized with Z-parameters.
a) True
b) False

Explanation: Input impedance of a two-port network system can be characterized with Z-parameters. It is known as open circuit input impedance. It is found by open circuiting the output port of 2port network.

8. Output impedance of a two-port network system cannot be characterized with Z-parameters.
a) True
b) False

Explanation: Output impedance of a two-port network system can be characterized with Z-parameters. It is known as open circuit output impedance. It is found by open circuiting the input port of two-port network.

9. Input admittance of a two-port network system cannot be characterized with Y-parameters.
a) True
b) False

Explanation: Input admittance of a two-port network system can be characterized with Y-parameters. It is known as short circuit input admittance. It is found by short circuiting the output port of 2port network.

10. Output admittance of a two-port network system cannot be characterized with Y-parameters.
a) True
b) False

Explanation: Output admittance of a two-port network system can be characterized with Y-parameters. It is known as short circuit output admittance. It is found by short circuiting the input port of 2port network.

11. Transfer impedance from output port to input port of a two-port network system cannot be characterized with Z-parameters.
a) True
b) False

Explanation: Transfer impedance from output port to input port of a two-port network system can be characterized with Z-parameters. It is known as open circuit transfer impedance from output port to input port. It is found by open circuiting the output port of 2port network.

12. Transfer impedance from input port to output port of a two-port network system cannot be characterized with Z-parameters.
a) True
b) False

Explanation: Transfer impedance from input port to output port of a two-port network system can be characterized with Z-parameters. It is known as open circuit transfer impedance from input port to output port. It is found by open circuiting the input port of 2port network.

13. Transfer admittance from output port to input port of a two-port network system cannot be characterized with Y-parameters.
a) True
b) False

Explanation: Transfer admittance from output port to input port of a two-port network system can be characterized with Y-parameters. It is known as short circuit transfer admittance from output port to input port. It is found by short circuiting the output port of 2port network.

14. Transfer admittance from input port to output port of a two-port network system cannot be characterized with Y-parameters.
a) True
b) False

Explanation: Transfer admittance from input port to output port of a two-port network system can be characterized with Y-parameters. It is known as short circuit transfer admittance from input port to output port. It is found by short circuiting the input port of 2port network.

15. ABCD parameters cannot be used to model transmission lines.
a) True
b) False

Explanation: ABCD parameters can be used to model transmission lines. They are also known as transmission parameters. Basically ABCD parameters find use in the representation of transmission lines using two-port network.

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

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