Power Electronics MCQs
Power Electronics combines the solid-state electronic components with control and power systems so as to control the electric power systems, drives, and industrial controls. While modern switchyards and substations heavily rely on power electronics, it is crucial to develop a clear image of the entire subject. In this regard, Electrical Engineering XYZ shares power electronics MCQs which are important for electrical jobs, competitive tests, university exams.
1. The device which performs dc-dc conversion:
- Inverter
- Rectifier
- Chopper
- Switch
Correct answer: c. Chopper
Explanation: Chopper is an electrical device which converts dc to dc.
2. The DIAC is a:
- One terminal device
- Two terminal device
- Three-terminal device
- Four terminal device
Correct answer: b. Two terminal device
3. The TRIAC is:
- An SCR
- Made up of three DIAC’s
- Is alike a bi-directional SCR
- None of these
Correct answer: c. Is alike a bi-directional SCR
The structure of TRIAC matches two SCR’s which are joined back to back in a parallel fashion. Thus we can relate a TRIAC with a bi-directional SCR.
4. A thyristor has:
- One pn junction
- Two pn junctions
- Three pn junctions
- Four pn junctions
Correct answer: c. Three pn junctions
5. The SCS has:
- Single gate terminal
- Two gate terminals
- Three gate terminals
- Four gate terminals
Correct answer: b. Two gate terminals
6. Forced commutation on SCS can be achieved by:
- Shorting anode and cathode terminals
- By Applying a negative voltage between anode and cathode
- Both of these
- None of these
Correct answer: c. Both of these
7. The correct statement about SCR:
- SCR is not a rectifier
- A single SCR can’t be used in full ac control
- SCR is not used commonly because it is very expensive
- GTO is a variant of SCR
Correct answer: b. A single SCR can’t be used in full ac control
8. PUT stands for:
- Programmable Unijunction Transistor
- Positive Unijunction Transistor
- Photoconductive Unijunction Transistor
- Pi Unijunction Transistor
Correct answer: a. Programmable Unijunction Transistor
9. A DIAC conducts current in:
- One direction
- Two directions
Correct answer: b. Two directions
10. The LASCR is:
- A laser activated SCR
- A light-activated SCR
- Lithium anode SCR
- None of these
Correct answer: b. A light-activated SCR
11. Sort the correct statement about DIAC and TRIAC:
- Both are bilateral devices
- TRIAC is bilateral, but DIAC is unilateral
- DIAC is bilateral, but TRIAC is unilateral
- Both are unilateral devices
Correct answer: a. Both are bilateral devices
12. Which one the following is not a thyristor:
- SCS
- UJT
- DIAC
- TRIAC
Correct answer: b. UJT
13. The device which performs dc-ac conversion:
- Inverter
- Rectifier
- Chopper
- Switch
Correct answer: a. Inverter
14. The SCS is a _____ terminal thyristor that has _____ gate terminals.
- Two, two
- Two, four
- Four, two
- Four, one
Correct answer: c. Four, two
15. The SCS is turned on by:
- Applying a negative pulse on anode gate
- Applying a positive pulse on anode gate
- Applying a negative pulse on cathode gate
- None of these
Correct answer: a. Applying a negative pulse on anode gate
16. UJT has ______ pn junction/junctions:
- Single
- Two
- Three
- Four
Correct answer: 1. Single
17. Which one of the following is not a thyristor:
- PUT
- UJT
- SCS
- DIAC
Correct answer: b. UJT
18. LASCR is a:
- Rectifier
- Thyristor
- Both of these
- None of these
Correct answer: 3. Both of these
19. ______ has/have no gate terminal:
- Diac
- Triac
- Both of these
- None of these
Correct answer: a. Diac
20. The method which can be used to latch Shockley diode:
- Exceed the critical rate of voltage rise from anode to cathode
- Exceed the breakover voltage from anode to cathode
- Both of these
- None of these
Correct answer: 3. Both of these
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