Power Electronics MCQs Multiple Choice Questions and Answers Objective Questions and Answers

Power Electronics MCQs

1. The device which performs dc-dc conversion:

1. Inverter
2. Rectifier
3. Chopper
4. Switch

Ans: 3

2. The DIAC is a:

1. One terminal device
2. Two terminal device
3. Three-terminal device
4. Four terminal device

Ans: 2

3. The TRIAC is:

1. An SCR
2. Made up of three DIAC’s
3. Is alike a bi-directional SCR
4. None of these

Ans: 3

4. A thyristor has:

1. One pn junction
2. Two pn junctions
3. Three pn junctions
4. Four pn junctions

Ans: 3

5. The SCS has:

1. Single gate terminal
2. Two gate terminals
3. Three gate terminals
4. Four gate terminals

Ans: 2

6. Forced commutation on SCS can be achieved by:

1. Shorting anode and cathode terminals
2. By Applying a negative voltage between anode and cathode
3. Both of these
4. None of these

Ans: 3

7. The correct statement about SCR:

1. SCR is not a rectifier
2. A single SCR can’t be used in full ac control
3. SCR is not used commonly because it is very expensive
4. GTO is a variant of SCR

Ans: 2

8. PUT stands for:

1. Programmable Unijunction Transistor
2. Positive Unijunction Transistor
3. Photoconductive Unijunction Transistor
4. Pi Unijunction Transistor

Ans: 1

9. A DIAC conducts current in:

1. One direction
2. Two directions

Ans: 2

10. The LASCR is:

1. A laser activated SCR
2. A light-activated SCR
3. Lithium anode SCR
4. None of these

Ans: 2