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# Floyd: MCQ in 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

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

If you are looking for the Self-test in Floyd’s Electronic Devices proceed to

#### 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.

Solution:

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.

Solution:

3. Schottky diodes are also known as

A) PIN diodes.

B) hot carrier diodes.

C) step-recovery diodes.

D) tunnel diodes.

Solution:

4. A laser diode normally emits

A) coherent light.

B) monochromatic light.

C) coherent and monochromatic light.

D) neither coherent nor monochromatic light.

Solution:

5. An 8.2 V zener has a resistance of 5 โฆ. 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.

Solution:

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.

Solution:

7. Refer to Figure 3-1. If the load current increases, IR will ______ and IZ will ______.

Figure 3-1

A) remain the same, increase

B) decrease, remain the same

C) increase, remain the same

D) remain the same, decrease

Solution:

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

A) increase.

B) decrease.

C) remain the same.

D) none of the above

Solution:

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

A) increase.

B) decrease.

C) remain the same.

D) none of the above

Solution:

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

A) increase.

B) decrease.

C) remain the same.

d) none of the above

Solution:

11. Refer to Figure 3-2. Identify the Schottky diode.

Figure 3-2

A) a

B) b

C) c

D) d

E) e

Solution:

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

A) a

B) b

C) c

D) d

E) e

Solution:

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

A) a

B) b

C) c

D) d

E) e

Solution:

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

A) a

B) b

C) c

D) d

E) e

Solution:

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

A) a

B) b

C) c

D) d

E) e

Solution:

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.

Solution:

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.

Solution:

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.

Solution:

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.

Solution:

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

Solution:

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

Solution:

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

A) varactor

B) Schottky

C) LED

D) Gunn

Solution:

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

Solution:

24. LEDs are made out of

A) silicon.

B) germanium.

C) gallium.

D) silicon and germanium, but not gallium.

Solution:

25. What type of diode maintains a constant current?

A) LED

B) zener

C) current regulator

D) pin

E) none of the above

Solution:

26. What diode operates only with majority carriers?

A) laser

B) tunnel

C) Schottky

D) step-recovery

Solution:

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

A) laser

B) tunnel

C) pin

D) Schottky

Solution:

28. Which diode employs graded doping?

A) zener

B) LED

C) tunnel

D) step-recovery

Solution:

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

A) zener

B) LED

C) laser

D) Schottky

Solution:

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

Solution:

### Complete List of Chapter Quiz in Floyd’s Electronic Devices

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