# Malvino: MCQ in Special Purpose Diodes

(Last Updated On: February 7, 2020)

This is the Multiple Choice Questions in Chapter 5: Special-Purpose Diodes from the book Electronic Principles 7th Edition by Albert Malvino. 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.

### Topic Outline

• MCQs in Zener Diode
• MCQs in Zener Regulator
• MCQs in Second Approximation of Zener Diode
• MCQs in Zener Drop-Out Point
• MCQs in Optoelectronic Devices
• MCQs in Schottky Diode
• MCQs in Varactor
• MCQs in Other Diodes

### Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. What is true about the breakdown voltage in a zener diode?

• a. It decreases when current increases.
• b. It destroys the diode.
• c. It equals the current times the resistance.
• d. It is approximately constant.

2. Which of these is the best description of a zener diode?

• a. It is a rectifier diode.
• b. It is a constant-voltage device.
• c. It is a constant-current device.
• d. It works in the forward region.

3. A zener diode

• a. Is a battery
• b. Has a constant voltage in the breakdown region
• c. Has a barrier potential of 1 V
• d. Is forward-biased

4. The voltage across the zener resistance is usually

• a. Small
• b. Large
• c. Measured in volts
• d. Subtracted from the breakdown voltage

5. If the series resistance decreases in an unloaded zener regulator, the zener current

• a. Decreases
• b. Stays the same
• c. Increases
• d. Equals the voltage divided by the resistance

6.In the second approximation, the total voltage across the zener diode is the sum of-the breakdown voltage and the voltage across the

• a. Source
• b. Series resistor
• c. Zener resistance
• d. Zener diode

7. The load voltage is approximately constant when a zener diode is

• a. Forward-biased
• b. Reverse-biased
• c. Operating in the breakdown region
• d. Unbiased

8. In a loaded zener regulator, which has the largest current?

• a. Series current
• b. Zener current
• d. None of these

9. If the load resistance decreases in a zener regulator, the zener current

• a. Decreases
• b. Stays the same
• c. Increases
• d. Equals the source voltage divided by the series resistance

10. If the load resistance decreases in a zener regulator, the series current

• a. Decreases
• b. Stays the same
• c. Increases
• d. Equals the source voltage divided by the series resistance

11. When the source voltage increases in a zener regulator, which of these currents remains approximately constant?

• a. Series current
• b. Zener current
• d. Total current

12. If the zener diode in a zener regulator is connected with the wrong polarity, the load voltage will be closest to

• a. 0.7 V
• b. 10 V
• c. 14 V
• d. 18 V

13. At high frequencies, ordinary diodes don’t work properly because of

• a. Forward bias
• b. Reverse bias
• c. Breakdown
• d. Charge storage

14. The capacitance of a varactor diode increases when the reverse voltage across it

• a. Decreases
• b. Increases
• c. Breaks down
• d. Stores charges

15. Breakdown does not destroy a zener diode provided the zener current is less than the

• a. Breakdown voltage
• b. Zener test current
• c. Maximum zener current rating
• d. Banier potential

16. To display the digit 8 in a seven-segment indicator,

• a. C must be lighted
• b. G must be off
• c. F must be on
• d. All segments must be on

17. A photodiode is normally

• a. Forward-biased
• b. Reverse-biased
• c. Neither forward- nor reverse biased
• d. Emitting light

18. When the light increases, the reverse minority carrier current in a photodiode

• a. Decreases
• b. Increases
• c. Is unaffected
• d. Reverses direction

19. The device associated with voltage-controlled capacitance is a

• a. Light-emitting diode
• b. Photodiode
• c. Varactor diode
• d. Zener diode

20. If the depletion layer gets wider, the capacitance

• a. Decreases
• b. Stays the same
• c. Increases
• d. Is variable

21. When the reverse voltage increases, the capacitance

• a. Decreases
• b. Stays the same
• c. Increases
• d. Has more bandwidth

22. The varactor is usually

• a. Forward-biased
• b. Reverse-biased
• c. Unbiased
• d. Operated in the breakdown region

23. The device to use for rectifying a weak ac signal is a

• a. Zener diode
• b. Light-emitting diode
• c. Varistor
• d. Back diode

24. Which of the following has a negative-resistance region?

• a. Tunnel diode
• b. Step-recovery diode
• c. Schottky diode
• d. Optocoupler

25. A blown-fuse indicator uses a

• a. Zener diode
• b. Constant-current diode
• c. Light-emitting diode
• d. Back diode

26. To isolate an output circuit from an input circuit, which is the device to use?

• a. Back diode
• b. Optocoupler
• c. Seven-segment indicator
• d. Tunnel diode

27. The diode with a forward voltage drop of approximately 0.25 V is the

• a. Step-recovery diode
• b. Schottky diode
• c. Back diode
• d. Constant-current diode

28. For typical operation, you need to use reverse bias with a

• a. Zener diode
• b. Photodiode
• c. Varactor
• d. All of the above

### Complete List of MCQ in Electronic Principles by Albert Malvino

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