MCQs in Special-Purpose Diodes

(Last Updated On: December 8, 2017)
MCQs for Special-Purpose Diodes

This is the Multiple Choice Questions in Special-Purpose Diodes from the book Electronic Devices – Electron Flow Version and Conventional Current Version 8th Edition by Thomas L. Floyd. If you are looking for a reviewer in Electronics Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

Online Questions and Answers Topic Outline

  • MCQs in The Zener Diode
  • MCQs in Zener Diode Applications
  • MCQs in The Varactor Diode
  • MCQs in Optical Diodes
  • MCQs in Other Types of Diodes
  • MCQs in GreenTech Application 3: Solar Power

Practice Exam Test Quesions

Choose the letter of the best answer in each questions.

1. The process of emitting photons from a semiconductive material is called
  • A) photoluminescence.
  • B) gallium arsenide.
  • C) electroluminescence.
  • D) gallium phosphide.

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

  • A) forward-bias region.
  • B) reverse-bias region.
  • C) zero-crossing region.
  • D) reverse-breakdown region.

3. Schottky diodes are also known as

  • A) PIN diodes.
  • B) hot carrier diodes.
  • C) step-recovery diodes.
  • D) tunnel diodes.

4. A laser diode normally emits

  • A) coherent light.
  • B) monochromatic light.
  • C) coherent and monochromatic light.
  • D) neither coherent nor monochromatic light.
5. An 8.2 V zener has a resistance of 5 Ω. The actual voltage across its terminals when the current is 25 mA is
  • A) 8.2 V.
  • B) 125 mV.
  • C) 8.325 V.
  • D) 8.075 V.
6. A 6.2 V zener is rated at 1 watt. The maximum safe current the zener can carry is
  • A) 1.61 A.
  • B) 161 mA.
  • C) 16.1 mA.
  • D) 1.61 mA.
7. Refer to Figure 3-1. If the load current increases, IR will _____ and IZ will _____.

MCQs in Special-Purpose Diodes Fig. 01
Figure 3-1

  • A) remain the same, increase
  • B) decrease, remain the same
  • C) increase, remain the same
  • D) remain the same, decrease

8. Refer to Figure 3-1. If VIN attempts to increase, VR will

  • A) increase.
  • B) decrease.
  • C) remain the same.

9. Refer to Figure 3-1. If VIN increases, IZ will

  • A) increase.
  • B) decrease.
  • C) remain the same.

10. Refer to Figure 3-1. If VIN decreases, IR will

  • A) increase.
  • B) decrease.
  • C) remain the same.

11. Refer to Figure 3-2. Identify the Schottky diode.
MCQs in Special-Purpose Diodes Fig. 02
Figure 3-2

  • A) a
  • B) b
  • C) c
  • D) d
  • E) e

12. Refer to Figure 3-2. Which symbol is correct for a zener diode?

  • A) a
  • B) b
  • C) c
  • D) d
  • E) e

13. Refer to Figure 3-2. Find the tunnel diode symbol.

  • A) a
  • B) b
  • C) c
  • D) d
  • E) e

14. Refer to Figure 3-2. Which symbol is correct for a photodiode?

  • A) a
  • B) b
  • C) c
  • D) d
  • E) e

15. Refer to Figure 3-2. Which symbol is correct for an LED?

  • A) a
  • B) b
  • C) c
  • D) d
  • E) e
16. An LED is forward-biased. The diode should be on, but no light is showing. A possible trouble might be
  • A) the diode is open.
  • B) the series resistor is too small.
  • C) none. The diode should be off if forward-biased.
  • D) the power supply voltage is too high.

17. The Schottky diode is used

  • A) in high-power circuits.
  • B) in circuits requiring negative resistance.
  • C) in very fast-switching circuits.
  • D) in power supply rectifiers.

18. A tunnel diode is used

  • A) in high-power circuits.
  • B) in circuits requiring negative resistance.
  • C) in very fast-switching circuits.
  • D) in power supply rectifiers.
19. You have an application for a diode to be used in a tuning circuit. A type of diode to use might be
  • A) an LED.
  • B) a Schottky diode.
  • C) a Gunn diode.
  • D) a varactor.
20. Zener diodes with breakdown voltages less than 5 V operate predominantly in what type of breakdown?
  • A) avalanche
  • B) zener
  • C) varactor
  • D) Schottky
21. Zener diodes with breakdown voltages greater than 5 V operate predominantly in what type of breakdown?
  • A) avalanche
  • B) zener
  • C) varactor
  • D) Schottky

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

  • A) varactor
  • B) Schottky
  • C) LED
  • D) Gunn
23. A varactor is a pn junction diode that always operates in _____-bias and is doped to _____ the inherent capacitance of the depletion region.
  • A) forward, maximize
  • B) reverse, maximize
  • C) reverse, minimize
  • D) forward, minimize

24. LEDs are made out of

  • A) silicon.
  • B) germanium.
  • C) gallium.
  • D) silicon and germanium, but not gallium.

25. What type of diode maintains a constant current?

  • A) LED
  • B) zener
  • C) current regulator
  • D) pin
  • E) none of the above

26. What diode operates only with majority carriers?

  • A) laser
  • B) tunnel
  • C) Schottky
  • D) step-recovery
27. What kind of diode is formed by joining a doped semiconductor region with a metal?
  • A) laser
  • B) tunnel
  • C) pin
  • D) Schottky

28. Which diode employs graded doping?

  • A) zener
  • B) LED
  • C) tunnel
  • D) step-recovery

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

  • A) zener
  • B) LED
  • C) laser
  • D) Schottky

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

  • A) over-voltage protection
  • B) a wider tuning range
  • C) to eliminate harmonic distortion
  • D) no reason; only zeners are used in a back-to-back configuration

Check your work.

Complete List of Chapter Quiz in Floyd’s Electronic Devices

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MCQs in Special-Purpose Diodes
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