# FACTS Questions and Answers – Power Semiconductor Devices – Current Sourced Converter – Set 2

This set of FACTS Multiple Choice Questions & Answers (MCQs) focuses on “Power Semiconductor Devices – Current Sourced Converter – Set 2”.

1. ________ of network using G-parameters of two-port modeling is found out by short circuiting the output port.
a) The reverse current gain
b) The reverse voltage gain and forward voltage gain
c) The reverse current gain and forward current gain
d) No gain

Explanation: No gain of network using G-parameters of two-port modeling is found out by short circuiting the output port. The reverse current gain of network using G-parameters of two-port modeling is found out by short circuiting the input port. However, forward voltage gain of network using G-parameters of two-port modeling is found out by open circuiting the output port.

2. ________ of network using H-parameters of two-port modeling is found out by short circuiting the input port.
a) The reverse current gain
b) The reverse voltage gain and forward voltage gain
c) The reverse current gain and forward current gain
d) No gain

Explanation: No gain of network using H-parameters of two-port modeling is found out by short circuiting the input port. The reverse voltage gain of network using H-parameters of two-port modeling is found out by open circuiting the input port. However, forward current gain of network using H-parameters of two-port modeling is found out by short circuiting the output port.

3. CSC stands for ________
a) Current Sourced Converter
b) Current Sourced Capacitor
c) Current Sourced Compensation
d) Constant Sourced Converter

Explanation: CSC stands for Current Sourced Converter. The control scheme of CSC is complex as compared with that of CSC. Even the harmonic content of CSC is more than that of VSC.

4. The output voltage of CSC remains constant under any loading condition.
a) True
b) False

Explanation: The output voltage of CSC does not remain constant at load condition. The output voltage of CSC rather changes with load. This makes it unfavorable for FACTS application.

5. The losses of current source converter are ________ that of voltage source converter
a) higher than
b) lower than
c) equal to
d) either higher or lower than

Explanation: The losses of current source converter are higher than that of voltage source converter. This is because CSC does incorporate series reactor. This results in relatively less efficiency in the CCS.

6. In current source converter based transmission system the current polarity for power reversal________
a) changes
b) may or may not change
c) remains the same
d) cannot be ascertained

Explanation: In current source converter based transmission system the current polarity for power reversal remains the same. Actually power transfer depends only on the direction of the DC voltage. So change of voltage polarity manifests the power reversal.

7. The CSC cannot work in all four quadrants.
a) True
b) False

Explanation: The CSC can work in all four quadrants as it able to work both as a rectifier and an inverter. The converter able to convert dc into ac is known as an inverter. On the other hand the converter used to convert ac into dc is called a rectifier.

8. The amplitude of ________ in CSC does not depend upon loading condition.
a) output voltage
b) output current
c) neither output voltage nor output current
d) both output current and output voltage

Explanation: The amplitude of output current in CSC does not depend upon loading condition. On the other hand the amplitude of output voltage in CSC does depend upon load. Also the waveform of output voltage in CSC depends upon loading condition.

9. The current of power devices incorporating CSC is limited.
a) True
b) False

Explanation: The current of power devices incorporating CSC is limited. This is because the input current is maintained constant. So, the misfiring of switching device (if any) would not pose a serious problem.

10. A CSC is constructed based on the gate turn-off devices only.
a) True
b) False

Explanation: A CSC can be constructed based on the gate turn-off devices also. It may be based on conventional thyristors even. Also diode based CSC does exist.

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

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