Power Electronics MCQs
1. The device which performs dc-dc conversion:
- Inverter
- Rectifier
- Chopper
- Switch
Ans: 3
2. The DIAC is a:
- One terminal device
- Two terminal device
- Three-terminal device
- Four terminal device
Ans: 2
3. The TRIAC is:
- An SCR
- Made up of three DIAC’s
- Is alike a bi-directional SCR
- None of these
Ans: 3
4. A thyristor has:
- One pn junction
- Two pn junctions
- Three pn junctions
- Four pn junctions
Ans: 3
5. The SCS has:
- Single gate terminal
- Two gate terminals
- Three gate terminals
- Four gate terminals
Ans: 2
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
Ans: 3
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
Ans: 2
8. PUT stands for:
- Programmable Unijunction Transistor
- Positive Unijunction Transistor
- Photoconductive Unijunction Transistor
- Pi Unijunction Transistor
Ans: 1
9. A DIAC conducts current in:
- One direction
- Two directions
Ans: 2
10. The LASCR is:
- A laser activated SCR
- A light-activated SCR
- Lithium anode SCR
- None of these
Ans: 2