# MCQs in Diode Circuits

Multiple Choice Questions in Diode Circuits from the book Electronic Principles by Albert Malvino. Make sure to familiarize each and every questions

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

### Begin and Good luck!

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

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