Home > Electronics Mechanic > Quizzes > Electronic Mechanic Practice Test: Opto - Electronics
Electronic Mechanic Practice Test: Opto - Electronics
Fast practice, instant feedback. Timer auto-submits when time’s up.
Avg score: 75% • Most missed: “What is the use of photo transistor?”
Electronic Mechanic Practice Test: Opto - Electronics
Time left 00:00
25 Questions

1. Which measuring instrument is used to check the working condition of a photo resistor (LDR)?
2. What is the type of transistor BPX81?
3. Which is the combination of photo transistor?
4. What is the advantage of PIN photo diodes?
5. Which is the combination of photo transistor?
6. Which circuit uses photo-darlington devices?
7. What is the forward voltage for the single colour orange LEDs?
8. What is the drawbacks of LDR?
9. What is the function of opto-coupler in the switching operation of digital input signal?
10. What is the maximum reverse voltage that can be applied across the general purpose LED?
11. What is the maximum reverse voltage that can be applied across the general purpose LED?
12. What is the use of photo transistor?
13. What is the typical forward voltage drop of the yellow colour LED?
14. Which electronic device inversely changes its resistance with the amount of light falling on it?
15. Which material is used to make LDR for lower end requirements?
16. What is the range of photo current for photo transistor BPX 38?
17. Which purpose the cadmium sulfide cells (CDS cells) are used?
18. What is the forward voltage drop of single colour Red LED?
19. Which of the device is opto-coupled TRIACS?
20. What is the main application of photo resistor?
21. Which circuit photo SCR opto couplers are used?
22. Which material is used to make LDR for lower end requirements?
23. What will happen if the photo resistor (LDR) is exposed to low level light condition?
24. What is the minimum forward current for single colour LEDs?
25. Which material is used to make LDR for higher end requirements?

⚡ Recently practiced quizzes in this topic
Live quiz activity
Electronic Mechanic Practice Test: Basic Gates, Combinational Circuits, Flip-flops Electronic Mechanic Practice Test: MOSFET & IGBT Electronic Mechanic Practice Test: Electronic Circuit Simulator Electronic Mechanic Practice Test: Basic SMD Electronics Mechanic Practice Test: Cathode Ray Oscilloscope Electronic Mechanic Practice Test: Electronic Cables and Connectors Electronics Mechanic Practice Test: Modulation And Detection Electronic Mechanic Practice Test: Communication Electronics
 
❤ If you liked Fatskills, consider supporting us by checking out The Life Manuals You Never Got.

🌈  Our mission is to help improve your scores in any subject and exam withonline quizzes, practice tests, study guides, & advice for students. Since 2018.
About | Explore | User Guide | Topics | Subjects | Doubt Solver | Career Aptitude Test | Answers | Free Tools | OSHA Basics Quiz | What Should We Know?
Privacy | Terms |
Without work one finishes nothing. - Ralph Waldo Emerson
© 2026 Fatskills.com

All trademarks, logos and brand names are the property of their respective owners. All company, product and service names used in this website are for identification purposes only. Use of these names, trademarks and brands does not imply endorsement.