electronic-devices-special-purpose-diodes Related Question Answers

1. Refer to this figure. If VIN increases, IZ will




2. What kind of diode is formed by joining a doped semiconductor region with a metal?





3. Refer to this figure. Which symbol is correct for a zener diode?






4. Which diode employs graded doping?





5. Refer to this figure. Identify the Schottky diode.






6. LEDs are made out of





7. The normal operating region for a zener diode is the





8. Refer to this figure. If VIN attempts to increase, VR will




9. An LED is forward-biased. The diode should be on, but no light is showing. A possible trouble might be





10. A 6.2 V zener is rated at 1 watt. The maximum safe current the zener can carry is





11. Refer to this figure. Find the tunnel diode symbol.






12. Refer to this figure. If the load current increases, IR will ________ and IZ will ________.





13. The process of emitting photons from a semiconductive material is called





14. An 8.2 V zener has a resistance of 5. The actual voltage across its terminals when the current is 25 mA is





15. What diode operates only with majority carriers?





16. Refer to this figure. Which symbol is correct for a photodiode?






17. What type of diode maintains a constant current?






18. What diode is used in seven-segment displays?





19. Refer to this figure. If VIN decreases, IR will




20. Zener diodes with breakdown voltages greater than 5 V operate predominantly in what type of breakdown?





21. Back-to-back varactor diodes are used for what reason?





22. A tunnel diode is used





23. What type of diode is commonly used in electronic tuners in TVs?





24. A laser diode normally emits





25. A varactor is a pn junction diode that always operates in ________-bias and is doped to ________ the inherent capacitance of the depletion region.





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