# Malvino: MCQ in Diode Theory

(Last Updated On: February 7, 2020)

This is the Multiple Choice Questions in Chapter 3: Diode Theory 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 Basic Ideas
• MCQs in the Ideal Diode
• MCQs in the Second Approximation
• MCQs in the Third Approximation
• MCQs in Up-Down Circuit Analysis
• MCQs in How to calculate Bulk Resistance
• MCQs in DC Resistance of a Diode
• MCQs in Surface-Mount Diodes

### Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1 . When the graph of current versus voltage is a straight line, the device is referred to as

• a. Active
• b. Linear
• c. Nonlinear
• d. Passive

2. What kind of device is a resistor?

• a. Unilateral
• b. Linear
• c. Nonlinear
• d. Bipolar

3. What kind of a device is a diode?

• a. Bilateral
• b. Linear
• c. Nonlinear
• d. Unipolar

4. How is a non-conducting diode biased?

• a. Forward
• b. Inverse
• c. Poorly
• d. Reverse

5. When the diode current is large, the bias is

• a. Forward
• b. Inverse
• c. Poor
• d. Reverse

6. The knee voltage of a diode is approximately equal to the

• a. Applied voltage
• b. Barrier potential
• c. Breakdown voltage
• d. Forward voltage

7. The reverse current consists of minority-carrier current and

• a. Avalanche current
• b. Forward current
• c. Surface-leakage current
• d. Zener current

8. How much voltage is there across the second approximation of a silicon diode when it is forward biased?

• a. 0
• b. 0.3 V
• c. 0.7 V
• d. 1 V

9. How much current is there through the second approximation of a silicon diode when it is reverse biased?

• a. 0
• b. 1 mA
• c. 300 mA
• d. None of the above

10. How much forward diode voltage is there with the ideal diode approximation?

• a. 0
• b. 0.7 V
• c. More than 0.7 V
• d. 1 V

11. The bulk resistance of a 1N4001 is

• a. 0
• b. 0.23 ohm
• c. 10 ohm
• d. 1 kohm

12. If the bulk resistance is zero, the graph above the knee becomes

• a. Horizontal
• b. Vertical
• c. Tilted at 450
• d. None of the above

13. The ideal diode is usually adequate when

• a. Troubleshooting
• b. Doing precise calculations
• c. The source voltage is low
• d. The load resistance is low

14. The second approximation works well when

• a. Troubleshooting
• b. Load resistance is high
• c. Source voltage is high
• d. All of the above

15. The only time you have to use the third approximation is when

• a. Load resistance is low
• b. Source voltage is high
• c. Troubleshooting
• d. None of the above

16. How much load current is there in Fig. 3-19 (see your textbook) with the ideal diode?

• a. 0
• b. 14.3 mA
• c. 15 mA
• d. 50 mA

17. How much load current is there in Fig. 3-19 (see your textbook) with the second approximation?

• a. 0
• b. 14.3 mA
• c. 15 mA
• d. 50 mA

18. How much load current is there in Fig. 3-19 with the third approximation?

• a. 0
• b. 14.3 mA
• c. 15 mA
• d. 50 mA

19. If the diode is open in Fig. 3-19, the load voltage is

• a. 0
• b. 14.3 V
• c. 20 V
• d. -15 V

20. If the resistor is ungrounded in Fig. 3-19, the voltage measured with a DMM between the top of the resistor and ground is closest to

• a. 0
• b. 15 V
• c. 20 V
• d. -15 V

21. The load voltage measures zero in Fig. 3-19. The trouble may be

• a. A shorted diode
• b. An open diode
• c. An open load resistor
• d. Too much supply voltage ### Complete List of MCQ in Electronic Principles by Albert Malvino

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