Special-Purpose Diodes Questions and Answers
Special-purpose diodes like Zener, LED, Schottky, and Varactor diodes play key roles in modern electronic circuits. These devices are common in aptitude questions and answers with explanations for PSU, BARC, and GATE electronics exams. Each diode type serves unique purposes—Zener diodes regulate voltage, LEDs emit light, and Schottky diodes allow fast switching. Understanding their characteristics helps solve circuit-based numerical and theoretical problems. Practicing electronics aptitude questions with solutions PDF ensures thorough exam readiness and clarity on diode applications in real-world devices.
Special-Purpose Diodes
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19 questions
11. What diode operates only with majority carriers?
- laser
- tunnel
- Schottky
- step-recovery
12. What type of diode maintains a constant current?
- LED
- zener
- current regulator
- pin
14. Zener diodes with breakdown voltages greater than 5 V operate predominantly in what type of breakdown?
- avalanche
- zener
- varactor
- Schottky
15. Back-to-back varactor diodes are used for what reason?
- over-voltage protection
- a wider tuning range
- to eliminate harmonic distortion
- no reason; only zeners are used in a back-to-back configuration
16. A tunnel diode is used
- in high-power circuits.
- in circuits requiring negative resistance.
- in very fast-switching circuits.
- in power supply rectifiers.
17. What type of diode is commonly used in electronic tuners in TVs?
- varactor
- Schottky
- LED
- Gunn
18. A laser diode normally emits
- coherent light.
- monochromatic light.
- coherent and monochromatic light.
- neither coherent nor monochromatic light.
19. A varactor is a pn junction diode that always operates in ________-bias and is doped to ________ the inherent capacitance of the depletion region.
- forward, maximize
- reverse, maximize
- reverse, minimize
- forward, minimize