This set of FACTS Multiple Choice Questions & Answers (MCQs) focuses on “Multifunctional FACTS Controllers”.
1. IPC is the abbreviation of ________
a) Interphase Power Controller
b) Inductive Power Controller
c) Inherent Power Controller
d) Interactive Power Controller
View Answer
Explanation: IPC is the abbreviation of Interphase Power Controller. Basically it is a series-connected controller. It controls the active and reactive power of the transmission line independently by adjusting the phase shifts or the branch impedances or both.
2. Which of the following consists of inductive and capacitive branches in each phase?
a) IPC
b) IPFC
c) TCBR
d) TCVL
View Answer
Explanation: IPC consists of inductive and capacitive branches in each phase. These inductive and capacitive branches are subjected to separately phase shifted voltages. It can employ mechanical or electronic switches to set the active and reactive power by adjusting phase shifts, branch impedances.
3. Which of the following consists of MOV?
a) IPC
b) IPFC
c) TCBR
d) TCVL
View Answer
Explanation: MOV stands for metal-oxide varistor. A thyristor-switched MOV is employed in TCVL to limit the voltage across its terminals during transient conditions.
4. Which of the following FACTS devices consists of a resistor?
a) TCPST
b) TCVR
c) TCBR
d) TCVL
View Answer
Explanation: TCBR consists of a resistor which is thyristor switched. TCVL contains a variable resistor (varistor) made of metal-oxide. Transformer is present in both TCVR and TCPST.
5. Which of the following has the least influence on load flow control?
a) STATCOM
b) TCSC
c) SSSC
d) UPFC
View Answer
Explanation: Of the given options, STATCOM has the least influence on load flow control. TCSC shows an average influence on load flow control. Both SSSC and UPFC have strong influence on load flow control.
6. Which of the following has the highest influence on load flow control?
a) TCPAR
b) TCSC
c) STATCOM
d) SVC
View Answer
Explanation: Of the given options, TCPAR has the highest influence on load flow control. TCSC shows an average influence on load flow control. Both SVC and STATCOM have low influence on load flow control.
7. Which of the following has the least influence on voltage control?
a) STATCOM
b) TCSC
c) TCPAR
d) UPFC
View Answer
Explanation: Of the given options, TCSC has the least influence on voltage control. TCPAR shows an average influence on voltage control. Both STATCOM and UPFC have strong influence on voltage control.
8. Which of the following has the highest influence on voltage control?
a) SVC
b) TCSC
c) TCPAR
d) SSSC
View Answer
Explanation: Of the given options, SVC has the highest influence on voltage control. TCPAR shows an average influence on voltage control. Both TCSC and SSSC have the least influence on voltage control.
9. ________ has/have strong influence on Transient Stability of the system connected.
a) SVC
b) TCSC
c) TCPAR
d) SVC, TCSC
View Answer
Explanation: Both SVC and TCSC have strong influence on Transient Stability of the system connected. Same is true for STATCOM and SSSC. TCPAR has least influence on Transient Stability of the system connected.
10. ________ has/have strong influence on oscillation damping of the system connected.
a) SVC
b) TCSC
c) TCPAR
d) UPFC
View Answer
Explanation: UPFC has strong influence on oscillation damping of the system connected. SVC, TCSC, TCPAR have least influence on oscillation damping of the system connected. Same is true for STATCOM and SSSC.
11. A TSSC circuit may contain a number of ________ in series but each of them shunted by a switch.
a) capacitors
b) inductors
c) resistors
d) transformers
View Answer
Explanation: A TSSC circuit may contain a number of capacitors in series but each of them shunted by a switch. Each of that shunt/switch contains two anti-parallel thyristors. Like a TCSC, it is also a capacitive reactance compensator. Generally it gives stepwise control of series capacitive reactance.
12. A circuital combination of ________ with any energy source forms SSG.
a) STATCOM
b) TCSC
c) TCPAR
d) UPFC
View Answer
Explanation: A circuital combination of STATCOM with any energy source forms SSG. STATCOM can lead to both voltage-sourced and current-sourced converters. It can also be designed to form an active filter for absorbing system harmonics.
13. The chopping of reactive load by the electronically controlled thyristors in the system leads to form undesirable ________
a) odd-order harmonics
b) even-order harmonics
c) leading power factor
d) voltage control
View Answer
Explanation: The chopping of reactive load by the electronically controlled thyristors in the system leads to form undesirable odd-order harmonics. This brings in the high-power filter banks to smooth the waveform as required. Due to inherent capacitive property of filters, they contribute MVARs to the system connected.
14. The voltage collapse at any intense may occur and lead to ________
a) improper voltage depression
b) voltage amplitude variations
c) either improper voltage depression or voltage amplitude variations or both
d) neither improper voltage depression nor voltage amplitude variations ever
View Answer
Explanation: The voltage collapse at any intense may occur and lead to either improper voltage depression or voltage amplitude variations or both. Basically, the electric loads are dynamic in nature and along with its variation, the reactive power balance in the system varies. To control these dynamic voltage oscillations for better power distribution and stability, the appropriately chosen FACTS device can easily be fruitful.
15. TSC is a FACTS device with ________
a) no transients, with harmonics, high losses
b) no harmonics, with transients, low losses
c) no transients, no harmonics, low losses
d) no transients, with harmonics, low losses
View Answer
Explanation: TSC is a FACTS device with no transients, no harmonics, low losses. In TSC, a shunt connected capacitor is connected in series to bidirectional thyristor switches. The stepwise control of reactance in it is done with thyristors operated in either full conduction or zero conduction.
Sanfoundry Global Education & Learning Series – Flexible AC Transmission System (FACTS).
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