PNPN Questions and Answers
The PNPN structure forms the basis of semiconductor devices like SCRs and thyristors, making it a key topic in electronics aptitude exams. Questions related to PNPN are often included in aptitude questions and answers sections for GATE, ISRO, and PSU recruitment tests. Understanding its layer structure, operation, and switching characteristics helps you analyze semiconductor behavior effectively. This guide presents PNPN questions with answers and explanations designed for quick learning. Practicing these aptitude test practice online questions will strengthen your core knowledge in power electronics and improve your performance in technical exams.
PNPN
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24 questions
1. Which of the following devices does not have a cathode terminal?
- SCR
- SCS
- Triac
- Shockley diode
3. Which of the following devices is unquestionably of the greatest interest today?
- SCR
- GTO
- LASCR
- SCS
4. Which of the following devices has a negative-resistance region in its characteristics curve?
- SCR
- SCS
- Unijunction transistor
- Phototransistor
5. How many terminals does a programmable unijunction transistor (PUT) have?
- 4
- 3
- 2
- 1
6. The ISO-LIT Q1 16-pin Litronix opto-isolator DIP contains ________ opto-isolators.
- 4
- 8
- 12
- 6
8. Which one of the SCR terminals fires the SCR?
- Anode
- Cathode
- Gate
- All of the above
9. Which of the following devices has the smallest turn-off time?
- SCR
- GTO
- SCS
- LASCR
10. What is the frequency range of application of SCRs?
- About 10 kHz
- About 50 kHz
- About 250 kHz
- About 1 mHz