# FACTS Questions and Answers – Current-Sourced Versus Voltage-Sourced Converters – Set 3

This set of FACTS Multiple Choice Questions & Answers (MCQs) focuses on “Current-Sourced Versus Voltage-Sourced Converters – Set 3”.

1. An independent ________ source with a resistance in series finds application in Thevenin’s theorem.
a) voltage
b) current
c) voltage or current
d) unknown

Explanation: An independent voltage source with a resistance in series to it finds application in Thevenin’s theorem. On the other hand an independent current source with a resistance in parallel to it finds application in Norton’s theorem. Basically Thevenin’s theorem is the dual of Norton’s theorem.

2. An independent voltage source with a resistance in ________ finds application in Thevenin’s theorem.
a) parallel
b) series
c) series parallel combination
d) zig-zag connection

Explanation: An independent voltage source with a resistance in series to it finds application in Thevenin’s theorem. Actually Thevenin’s theorem is the dual of Norton’s theorem. In Norton’s theorem an independent current source with a resistance in parallel to it finds its application.

3. An independent current source with a resistance in ________ finds application in Norton’s theorem.
a) parallel
b) series
c) series parallel combination
d) zig-zag connection

Explanation: An independent current source with a resistance in parallel to it finds application in Norton’s theorem. On the other hand an independent voltage source with a resistance in series to it finds application in Thevenin’s theorem. Basically Norton’s theorem is the dual of Thevenin’s theorem.

4. An independent ________ source with a resistance in parallel finds application in Norton’s theorem.
a) voltage
b) current
c) voltage or current
d) unknown

Explanation: An independent current source with a resistance in parallel to it finds application in Norton’s theorem. Actually Norton’s theorem is the dual of Thevenin’s theorem. In Thevenin’s theorem an independent voltage source with a resistance in series finds its application.

5. Voltage-sourced converters do not require any other device with its main devices for reverse blocking capability.
a) True
b) False

Explanation: Voltage-sourced converters DO require any other device with its main devices for reverse blocking capability. They employ a reverse diode in parallel with each main device. These special diodes come with lowest possible reverse leakage current.

6. Current-Sourced Converters do not need elements with reverse voltage withstand capability to connect with the asymmetric main device.
a) True
b) False

Explanation: Current-Sourced Converters do need elements with reverse voltage withstand capability to connect with the asymmetric main device. Current-Sourced Converters need diode with reverse blocking voltage ability. These diodes are to be connected in series with the main device to obtain reverse voltage withstand functionality.

7. G-parameters can be used to model a voltage amplifier.
a) True
b) False

Explanation: G-parameters can be used to model a voltage amplifier. This two-port network representation denotes the output port as voltage controlled voltage source. This defines the main function of the voltage amplifier.

8. The G-parameter model of two-port network of a voltage amplifier characterizes no current controlled current source.
a) True
b) False

Explanation: The G-parameter model of two-port network of a voltage amplifier does characterize current controlled current source. Actually the input port is characterized by a voltage input port with its Norton equivalent representation. This shows that the input side possesses a current controlled current source.

9. Norton theorem can be applied, when the given circuit contains ________
a) only independent sources
b) only dependent sources
c) either independent or dependent sources
d) either independent or dependent sources or both

Explanation: Norton theorem can be applied, when the given circuit contains either independent or dependent sources or both. Norton theorem can also be applied to a circuit containing no sources. The later is done to find out only the equivalent Norton resistance.

10. The G-parameter model of two-port network of a voltage amplifier characterizes no voltage controlled voltage source.
a) True
b) False

Explanation: The G-parameter model of two-port network of a voltage amplifier does characterize voltage controlled voltage source. Actually the output port is characterized by a voltage output port with its Thevenin equivalent representation. This clarifies that the output side possess a voltage controlled voltage source.

11. The two-port representation with H-parameter model of current amplifier is the inverse of________
a) G-parameter model of current amplifier
b) H-parameter model of voltage amplifier
c) H-parameter model of current amplifier
d) G-parameter model of voltage amplifier

Explanation: The two-port representation with H-parameter model of current amplifier is the inverse of G-parameter model of voltage amplifier. The G-parameter modeling has a VCVS at the output port. The H-parameter modeling has a VCVS at the input port.

12. The two-port representation with H-parameter model of current amplifier exhibits ________
a) only VCVS
b) only CCCS
c) both CCCS and VCVS
d) both VCCS and CCVS

Explanation: The two-port representation with H-parameter model of current amplifier exhibits both CCCS and VCVS. The input port of H-parameter modeling depicts a VCVS. The output port of H-parameter modeling depicts a CCCS.

13. The two-port representation with G-parameter model of voltage amplifier exhibits ________
a) only VCCS
b) only CCVS
c) both CCCS and VCVS
d) both VCCS and CCVS

Explanation: The two-port representation with G-parameter model of voltage amplifier exhibits both CCCS and VCVS. From the mathematical calculation it follows that the there is neither VCCS nor CCVS in the model. The Thevenin equivalent output port houses a VCVS and the Norton equivalent input port houses a CCCS.

14. The G-parameters of two-port modeling exhibits ________
a) reverse current gain and forward voltage gain
b) reverse voltage gain and forward voltage gain
c) reverse current gain and forward current gain
d) reverse voltage gain and forward current gain

Explanation: The G-parameters of two-port modeling exhibits reverse current gain and forward voltage gain. It yields short circuit reverse current gain. It generates open-circuit forward voltage gain.

15. The H-parameters of two-port modeling exhibits ________
a) reverse current gain and forward voltage gain
b) reverse voltage gain and forward voltage gain
c) reverse current gain and forward current gain
d) reverse voltage gain and forward current gain

Explanation: The H-parameters of two-port modeling exhibits reverse current gain and forward voltage gain. It yields short circuit forward current gain. It generates open-circuit reverse voltage gain.

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