# Malvino: MCQ in Diode Circuits

(Last Updated On: September 29, 2020)

This is the Multiple Choice Questions in Chapter 4: Diode Circuits 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 Half-Wave Rectifier
• MCQs in Transformer
• MCQs in Full-Wave Rectifier
• MCQs in Bridge Rectifier
• MCQs in Choke-Input Filter
• MCQs in Capacitor-input Filter
• MCQs in Peak Inverse voltage and Surge Current
• MCQs in Power Supply
• MCQs in Clippers and Limiters
• MCQs in Clampers
• MCQs in Voltage Multipliers

### Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. If N1/N2 = 2, and the primary voltage is 120 V, what is the secondary voltage?

• a. 0 V
• b. 36 V
• c. 60 V
• d. 240 V

2. In a step-down transformer, which is larger?

• a. Primary voltage
• b. Secondary voltage
• c. Neither

3. A transformer has a turns ratio of 4: 1. What is the peak secondary voltage if 115 V rms is applied to the primary winding?

• a. 40.7 V
• b. 64.6 V
• c. 163 V
• d. 650 V

4. With a half-wave rectified voltage across the load resistor, load current flows for what part of a cycle?

• a. 0 degrees
• b. 90 degrees
• c. 180 degrees
• d. 360 degrees

5. Line voltage may be from 105 V rms to 125 rms in a half-wave rectifier. With a 5:1 step-down transformer, the maximum peak load voltage is closest to

• a. 21 V
• b. 25 V
• c. 29.6 V
• d. 35.4 V

6. The voltage out of a bridge rectifier is a

• a. Half-wave signal
• b. Full-wave signal
• c. Bridge-rectified signal
• d. Sine wave

7. If the line voltage is 115 V rms, a turns ratio of 5: 1 means the rms secondary voltage is closest to

• a. 15 V
• b. 23 V
• c. 30 V
• d. 35 V

8. What is the peak load voltage in a full-wave rectifier if the secondary voltage is 20 V rms?

• a. 0 V
• b. 0.7 V
• c. 14.1 V
• d. 28.3 V

9. We want a peak load voltage of 40 V out of a bridge rectifier. What is the approximate rms value of secondary voltage?

• a. 0 V
• b. 14.4 V
• c. 28.3 V
• d. 56.6 V

10. With a full-wave rectified voltage across the load resistor, load current flows for what part of a cycle?

• a. 0 degrees
• b. 90 degrees
• c. 180 degrees
• d. 360 degrees

11. What is the peak load voltage out of a bridge rectifier for a secondary voltage of 15 V rms? (Use second approximation.)

• a. 9.2 V
• b. 15 V
• c. 19.8 V
• d. 24.3 V

12. If line frequency is 60 Hz, the output frequency of a half-wave rectifier is

• a. 30 Hz
• b. 60 Hz
• c. 120 Hz
• d. 240 Hz

13. If line frequency is 60 Hz, the output frequency of a bridge rectifier is

• a. 30 Hz
• b. 60 Hz
• c. 120 Hz
• d. 240 Hz

14. With the same secondary voltage and filter, which has the most ripple?

• a. Half-wave rectifier
• b. Full-wave rectifier
• c. Bridge rectifier
• d. Impossible to say

15. With the same secondary voltage and filter, which produces the least load voltage?

• a. Half-wave rectifier
• b. Full-wave rectifier
• c. Bridge rectifier
• d. Impossible to say

16. If the filtered load current is 10 mA, which of the following has a diode current of 10 mA?

• a. Half-wave rectifier
• b. Full-wave rectifier
• c. Bridge rectifier
• d. Impossible to say

17. If the load current is 5 mA and the filter capacitance is 1000uF, what is the peak-to-peak ripple out of a bridge rectifier?

• a. 21.3 pV
• b. 56.3 nV
• c. 21.3 mV
• d. 41.7 mV

18. The diodes in a bridge rectifier each have a maximum dc current rating of 2 A. This means the dc load current can have a maximum value of

• a. 1 A
• b. 2 A
• c. 4 A
• d. 8 A

19. What is the PIV across each diode of a bridge rectifier with a secondary voltage of 20 V rms?

• a. 14.1 V
• b. 20 V
• c. 28.3 V
• d. 34 V

20. If the secondary voltage increases in a bridge rectifier with a capacitor-input filter, the load voltage will

• a. Decrease
• b. Stay the same
• c. Increase
• d. None of these

21. If the filter capacitance is increased, the ripple will

• a. Decrease
• b. Stay the same
• c. Increase
• d. None of these

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

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