This set of FACTS Multiple Choice Questions & Answers (MCQs) focuses on “Power Semiconductor Devices – Current Sourced Converter”.
1. Current sourced converters are characterized by ________
a) unidirectional voltage
b) bidirectional current
c) bidirectional voltage
d) unidirectional current
View Answer
Explanation: Current-sourced converters are characterized by unidirectional current. They find economical applications in HVDC schemes. They are different from voltage-sourced converters.
2. The reversal of power in current sourced converters is achieved by ________
a) reversal of current
b) reversal of voltage
c) reversal of external supply terminals
d) reversal of phase sequence
View Answer
Explanation: The reversal of power in current sourced converters is achieved by reversal of voltage, keeping current unidirectional. They find economical applications in HVDC schemes. Current sourced converters are basically unidirectional current converters.
3. A current source is an active element.
a) True
b) False
View Answer
Explanation: By definition an element of any circuit which provides or delivers power independently, is termed as an active element. A current source does deliver power of its own and hence is an active element. It is different from a voltage source.
4. A current source is the ________ of voltage source.
a) dual
b) relic
c) model
d) folder
View Answer
Explanation: A current source is the dual of voltage source. Current sources can be of independent and dependent types. Dependent varieties of current sources can be either voltage or current dependent.
5. An ideal current source delivers or absorbs current ________ of voltage across it.
a) independent
b) dependent
c) reluctant
d) hesitant
View Answer
Explanation: An ideal current source delivers or absorbs current independent of voltage across it. An independent current source delivers a constant current. A dependent current source delivers a current which is proportional to some other voltage or current in the circuit.
6. An ideal current source can be connected to an ideal open circuit.
a) True
b) False
View Answer
Explanation: An ideal current source can never be connected to an ideal open circuit. 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. Thus the definition of these two terms ‘ideal current source’ and ‘ideal open circuit’ do contradict between themselves. Hence they cannot be connected to each other.
7. A constant current source does charging of a capacitor exhibiting ________ relationship with time.
a) unknown
b) constant
c) exponential
d) linear
View Answer
Explanation: Basically a constant current source does charging of a capacitor exhibiting linearity with time. On the other hand a voltage source does charging of a capacitor exhibiting non-linear relationship with time. These different phenomena of charging a capacitor by constant current source and that by a voltage source find different applications in electronics.
8. Choose the right option among the alternatives–The current/voltage sourced converter may be represented by a gate turn-off device with a diode in series/anti-parallel to it.
a) Current, anti-parallel
b) Voltage, series
c) Current, series
d) Current or voltage, series
View Answer
Explanation: The current sourced converter may be represented by a gate turn-off device with a diode in series to it. It is based on the dc to ac converter. It can exchange active and/or reactive power with the ac system connected.
9. Choose the right option among the alternatives–The current/voltage sourced converter may be represented by a power device with a dc capacitor/inductor as its voltage/current source.
a) Current, capacitor, current
b) Voltage, capacitor, current
c) Current, inductor, current
d) Voltage, inductor, current
View Answer
Explanation: The current sourced converter may be represented by a power device with a dc inductor as its current source. Here the dc current of the dc inductor is offered to the ac side as ac current through sequential switching of devices. The power reversal involves reversal of voltage, not the current.
10. CSC is a natural ________ converter.
a) boost-type
b) buck-type
c) universal
d) reversal
View Answer
Explanation: CSC is a natural buck-type converter. As a characteristic feature, its output voltage is always greater than the maximum value of instantaneous phase-to-phase voltage of the system connected. So it cannot be a buck-type converter.
Sanfoundry Global Education & Learning Series – Flexible AC Transmission System (FACTS).
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