This set of FACTS Multiple Choice Questions & Answers (MCQs) focuses on “Current-Sourced Versus Voltage-Sourced Converters”.
1. Current-sourced converters having thyristors with no gate turn-off capability ________
a) do not consume reactive power
b) only supply reactive power
c) neither consume nor supply reactive power
d) only consume but cannot supply reactive power
View Answer
Explanation: Current-sourced converters based on thyristors with no gate turn-off capability only consume reactive power. They cannot supply reactive power. Current-sourced converters are more economical for large HVDC schemes.
2. Voltage-sourced converters having thyristors with gate turn-off capability _______
a) do not consume any power
b) can supply reactive power
c) neither consume nor supply reactive power
d) only consume but cannot supply reactive power
View Answer
Explanation: The voltage-sourced converters with gate turn-off thyristors can supply reactive power. It is the additional feature other than being capable of consuming reactive power. Practically speaking, the most dominant converters that are employed in FACTS Controllers are the voltage sourced ones.
3. Which among the following employs thyristors with gate turn off capability?
a) Voltage-sourced converters
b) Current-sourced converters
c) Neither current-nor voltage-sourced converters
d) Power sourced converters
View Answer
Explanation: Practically speaking, voltage sourced converters are based on thyristors with gate turn-off capability. They are preferably employed in FACTS Controllers. On the other hand, current-sourced converters are more economical for large HVDC schemes.
4. Which among the following employs thyristors with no gate turn off capability?
a) Voltage-sourced converters
b) Current-sourced converters
c) Both current-and voltage-sourced converters
d) Power sourced converters
View Answer
Explanation: Practically speaking, current-sourced converters employ thyristors with no gate turn-off capability. They are more economical for large HVDC schemes. On the other hand, voltage sourced converters are preferred in FACTS Controllers.
5. A current source can be ________
a) a passive element
b) an active element
c) both a passive and an active element
d) neither a passive or an active element
View Answer
Explanation: By definition an element of any circuit which provides or delivers power independently is termed as an active element. Current sources are active elements. Again, any circuit element which cannot provide or deliver power independently is known as a passive element, e.g. resistance, inductance and capacitance.
6. A voltage source can be ________
a) a passive element
b) an active element
c) both a passive and an active element
d) neither a passive or an active element
View Answer
Explanation: By definition, any circuit element which cannot provide or deliver power independently is known as a passive element, e.g. resistance, inductance and capacitance. Again an element of any circuit which provides or delivers power independently is termed as an active element. Voltage sources are active elements.
7. Both current and voltage sources can be of independent and dependent types.
a) True
b) False
View Answer
Explanation: Both current and voltage sources can be of independent and dependent types. Actually current source and voltage source are the duals of each other. Dependent varieties of both current and voltage sources can be either voltage or current dependent.
8. An ideal voltage source ________ to an ideal short circuit.
a) can always be connected
b) can never be connected
c) is equal
d) may or may not be connected
View Answer
Explanation: An ideal voltage source can never be connected to an ideal short circuit. This is because the theoretical definition of these two terms ‘ideal voltage source’ and ‘ideal short circuit’ do contradict between themselves. Ideal voltage source is characterized by finite non-zero voltage rather constant voltage in the circuit while ideal short circuit is typified with zero voltage across it.
9. An ideal current source ________ to an ideal open circuit.
a) can always be connected
b) can never be connected
c) is equal
d) may or may not be connected
View Answer
Explanation: An ideal current source can never be connected to an ideal open circuit. This is because the theoretical definition of these two terms ‘ideal current source’ and ‘ideal open circuit’ do contradict between themselves. Ideal current source is characterized by finite non-zero current rather constant current in the circuit while ideal open circuit is typified with zero current across it.
10. A voltage source is equivalent to a current source with the ________ source impedance.
a) different
b) same
c) same or different
d) zero
View Answer
Explanation: A voltage source is equivalent to a current source with the same source impedance. So is true for a current source. A voltage source is the dual of a current source and vice-versa.
Sanfoundry Global Education & Learning Series – Flexible AC Transmission System (FACTS).
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