This set of FACTS Multiple Choice Questions & Answers (MCQs) focuses on “Thyristor-Controlled Voltage and Phase Angle Regulators – Set 2”.
1. Before incorporation of thyristor, phase angle regulators were not employed.
a) True
b) False
View Answer
Explanation: Before incorporation of thyristor, phase angle regulators were employed. There were mechanical phase angle regulators present. They used to make use of on-load tap changers to control both real and reactive power flow.
2. PARs employing on-load tap changer with quadrature voltage injection controls ________
a) only real power
b) only reactive power
c) both real power and reactive power
d) neither real power nor reactive power
View Answer
Explanation: PARs employing on-load tap changer with quadrature voltage injection controls only real power. PARs employing on-load tap changer with quadrature voltage injection cannot control reactive power. Ensuring active-power flow control problems, it increases the utilization of transmission lines.
3. PARs employing on-load tap changer with in-phase voltage injection controls________
a) only real power
b) only reactive power
c) both real power and reactive power
d) neither real power nor reactive power
View Answer
Explanation: PARs employing on-load tap changer with in-phase voltage injection controls only reactive power. PARs employing on-load tap changer with in-phase voltage injection cannot control real power. Ensuring reactive-power flow control problems, it increases the utilization of transmission lines.
4. PSTs employing on-load tap changer utilizes the concept of ________ for reactive power control.
a) voltage magnitude adjustment
b) phase adjustment
c) either voltage magnitude or phase adjustment
d) neither voltage magnitude nor phase adjustment
View Answer
Explanation: PSTs employing on-load tap changer utilizes the concept of voltage magnitude adjustment for reactive power control. For this to achieve PSTs exhibit in-phase voltage injection. Quadrature voltage injection does not allow voltage magnitude adjustment.
5. PSTs employing on-load tap changer utilizes the concept of ________ for active power control.
a) voltage magnitude adjustment
b) phase adjustment
c) either voltage magnitude or phase adjustment
d) neither voltage magnitude nor phase adjustment
View Answer
Explanation: PSTs employing on-load tap changer utilizes the concept of phase adjustment for active power control. For this to achieve PSTs exhibit quadrature voltage injection. In-phase voltage injection does not allow voltage magnitude adjustment.
6. PARs cannot improve the loading of interconnected transmission systems.
a) True
b) False
View Answer
Explanation: PARs can improve the loading of interconnected transmission systems. PARs can redirect current flows to lessen inherent reactive loop flows in interconnected systems. Thus it reduces power loss and balances the loading of interconnected transmission systems.
7. PSTs cannot make both the reactive and real power flow control possible.
a) True
b) False
View Answer
Explanation: PSTs can make both the reactive and real power flow control possible. Actually PSTs encompasses both the functions of in-phase and quadrature injection of voltages. Their combined use makes PSTs to control both reactive and active components of power.
8. The voltage and angle regulators employing the classical arrangement of tap-changing transformers, lack the ability to exchange real power.
a) True
b) False
View Answer
Explanation: The voltage and angle regulators employing the classical arrangement of tap-changing transformers, do possess the ability to exchange real power. It is an added advantage over reactive compensators which lack in this quality. Thus voltage and angle regulators introduce this new property to the arena of controlling dynamic events.
9. The voltage and angle regulators employing the classical arrangement of tap-changing transformers can supply or absorb reactive power to the system.
a) True
b) False
View Answer
Explanation: The voltage and angle regulators employing the classical arrangement of tap-changing transformers cannot supply or absorb reactive power to the system. So the voltage and angle regulators when connected to a power system do make the system responsible for this to handle with. It is actually the reactive compensators who can supply or absorb reactive power.
10. The minimization of post-disturbance overloads is possible with voltage phase angle regulators employing fast electronic control.
a) True
b) False
View Answer
Explanation: The minimization of post-disturbance overloads is possible with voltage phase angle regulators employing fast electronic control. These voltage phase angle regulators employing fast electronic control possess the inherent property of delivering steady-state voltage control. They also exhibit power flow control.
Sanfoundry Global Education & Learning Series – Flexible AC Transmission System (FACTS).
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