This set of FACTS Multiple Choice Questions & Answers (MCQs) focuses on “Power Semiconductor Devices – Thyristor Based Converter – Set 2”.
1. Which of the following exhibits both unidirectional current capability and unipolar voltage-withstanding capability?
a) MOSFET
b) SCR
c) SITH
d) SIT
View Answer
Explanation: Out of the given options, only MOSFET exhibits both unidirectional current capability and unipolar voltage-withstanding capability. SITH exhibits a unidirectional current capability. But it does not exhibit unipolar voltage-withstanding capability.
2. Which of the following exhibits both unidirectional current capability and unipolar voltage-withstanding capability?
a) GTO
b) SCR
c) SITH
d) SIT
View Answer
Explanation: Out of the given options, only GTO exhibits both unidirectional current capability and unipolar voltage-withstanding capability. SIT exhibits a unidirectional current capability. But it does not exhibit unipolar voltage-withstanding capability.
3. Which of the following exhibits both unidirectional current capability and unipolar voltage-withstanding capability?
a) IGBT
b) TRIAC
c) RCT
d) SIT
View Answer
Explanation: Out of the given options, only IGBT exhibits both unidirectional current capability and unipolar voltage-withstanding capability. RCT does not exhibit a unidirectional current capability. Also it does not exhibit unipolar voltage-withstanding capability.
4. Which of the following exhibits both unidirectional current capability and unipolar voltage-withstanding capability?
a) MCT
b) TRIAC
c) RCT
d) SIT
View Answer
Explanation: Out of the given options, only MCT exhibits both unidirectional current capability and unipolar voltage-withstanding capability. TRIAC does not exhibit a unidirectional current capability. Also it does not exhibit unipolar voltage-withstanding capability.
5. Diode rectifiers are ________ rectifiers.
a) controlled
b) uncontrolled
c) controlled or uncontrolled
d) neither controlled nor uncontrolled
View Answer
Explanation: Diode rectifiers are uncontrolled rectifiers. This is because its main constituent item is diode. Diodes are inherently uncontrolled devices due to lack of any gate terminal in it.
6. AC-DC converters are uncontrolled rectifiers.
a) True
b) False
View Answer
Explanation: AC-DC converters are NOT uncontrolled rectifiers. They are controlled rectifiers. This is because the control terminal also known as gate terminal is present in its design.
7. Input to the diode rectifiers is always single phase while the input to the ac-dc converters is always three phase.
a) True
b) False
View Answer
Explanation: Input to the diode rectifiers is NOT always single phase while the input to the ac-dc converters is also NOT three phase always. Basically diode rectifiers can respond to both single phase and three phase input. Similarly ac-dc converters can also respond to both single phase and three phase input.
8. An AC-DC converter converts ac into a __________
a) variable dc voltage
b) fixed dc voltage
c) variable ac voltage
d) fixed ac voltage
View Answer
Explanation: An AC-DC converter converts ac into a variable dc voltage. A single phase AC-DC converter employs two thyristors. These two are connected in such a manner so as to convert respective positive and negative halves of the ac input into dc output.
9. An AC-AC converter converts ac into a _________
a) variable dc voltage
b) fixed dc voltage
c) variable ac voltage
d) fixed ac voltage
View Answer
Explanation: An AC-AC converter converts ac into a variable ac voltage. A single phase AC-AC converter employs one triac. The triac is connected in such a manner so as to convert respective positive and negative halves of the fixed ac input into respective positive and negative halves of the variable ac output with a difference of firing angle in each half.
10. Choppers are ________
a) AC – DC converters
b) DC – DC converters
c) DC – AC converters
d) AC – AC converters
View Answer
Explanation: Choppers are dc-dc converters. It converts fixed dc into a variable dc voltage. The output voltage depends on the duty cycle of the chopper.
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