# MCQs in Diode Applications

(Last Updated On: December 8, 2017)

This is the Multiple Choice Questions in Diode Applications 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

• MCQs in Diode Operation
• MCQs in Voltage-Current (V-I) Characteristics of a Diode
• MCQs in Diode Models
• MCQs in Half-Wave Rectifiers
• MCQs in Full-Wave Rectifiers
• MCQs in Power Supply Filters and Regulators
• MCQs in Diode Limiters and Clampers
• MCQs in Voltage Multipliers
• MCQs in The Diode Datasheet
• MCQs in GreenTech Application 2: Solar Power

### Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. If the ac supply is 60 Hz, what will be the ripple frequency out of the half-wave rectifier?
• A) 30 Hz
• B) 50 Hz
• C) 60 Hz
• D) 120 Hz
2. If the ac supply is 50 Hz, what will be the ripple frequency out of the full-wave rectifier?
• A) 50 Hz
• B) 60 Hz
• C) 100 Hz
• D) 120 Hz
3. A silicon diode in a half-wave rectifier has a barrier potential of 0.7 V. This has the effect of
• A) reducing the peak output voltage by 0.7 V.
• B) increasing the peak output voltage by 0.7 V.
• C) reducing the peak input voltage by 0.7 V.
• D) no effect.
4. In a regulated supply, what term describes how much change occurs in the output voltage for a given change in the input voltage?
• B) voltage regulator
• C) line regulation
• D) ripple voltage
5. In a regulated supply, what term describes how much change occurs in the output voltage over a certain range of load current values, from minimum to maximum current?
• A) line regulation
• B) voltage regulator
• C) current regulator

6. PIV is which of the following?

• A) peak input voltage
• B) peak inverse voltage
• C) peak immediate voltage
• D) positive input voltage
7. Refer to Figure 2-1. The probable trouble, if any, indicated by these voltages is
Figure 2-1
• A) one of the diodes is open.
• B) a diode is shorted.
• C) an open transformer secondary.
• D) the filter capacitor is shorted.
• E) no trouble exists.
8. Refer to Figure 2-1. If the voltmeter across the transformer reads 0 V, the probable trouble, if any, would be
• A) one of the diodes is open.
• B) a diode is shorted.
• C) an open transformer secondary.
• D) the filter capacitor is shorted.
• E) no trouble exists.
9. Refer to Figure 2-2. Which oscilloscope trace indicates the output from a properly operating half-wave rectifier without a filter?

Figure 2-2.
Assume that each scope has the same settings

• A) a
• B) b
• C) c
• D) d
10. Refer to Figure 2-2. Which oscilloscope trace indicates the output from a properly operating full-wave rectifier with a filter?
• A) a
• B) b
• C) c
• D) d
11. Refer to Figure 2-2. Which oscilloscope trace indicates the output from a full-wave filtered rectifier with an open diode?
• A) a
• B) b
• C) c
• D) d
12. Refer to Figure 2-2. The oscilloscope trace in (b) could represent the output from
• A) a full-wave rectifier (no filter) with an open diode.
• B) a normal half-wave power supply.
• C) a filtered full-wave rectifier with an open diode.
• D) a full-wave rectifier with a shorted diode.
13. Refer to the circuit in Figure 2-3(a). Refer to the output waveforms shown in Figure 2-4 and select the correct approximate output waveform.

Figure 2-3

Figure 2-4

• A) a
• B) b
• C) c
• D) d
14. Refer to the circuit in Figure 2-3(b). Refer to the output waveforms shown in Figure 2-4 and select the correct approximate output waveform.
• A) a
• B) b
• C) c
• D) d
15. Refer to the circuit in Figure 2-3(c). Refer to the output waveforms shown in Figure 2-4 and select the correct approximate output waveform.
• A) a
• B) b
• C) c
• D) d
16. Refer to the circuit in Figure 2-3(d). Refer to the output waveforms shown in Figure 2-4 and select the correct approximate output waveform.
• A) a
• B) b
• C) c
• D) d
17. Refer to Figure 2-5. Which diode arrangement will supply a negative output voltage?

Figure 2-5

• A) a
• B) b
• C) c
• D) d
18. Refer to Figure 2-5. Which diode arrangement will supply a positive output voltage?
• A) a
• B) b
• C) c
• D) d
19. A silicon diode has a voltage to ground of –117 V from the anode. The voltage to ground from the cathode is –117.7 V. The diode is
• A) open.
• B) shorted.
• C) forward-biased.
• D) reverse-biased.
20. The output frequency of a half-wave rectifier is _____ the input frequency.
• A) one-half
• B) twice
• C) equal to
• D) none of the above
21. Each diode in a center-tapped full-wave rectifier is _____ -biased and conducts for _____ of the input cycle.
• A) forward, 90º
• B) reverse, 180º
• C) forward, 180º
• D) reverse, 90º
22. The output frequency of a full-wave rectifier is _____ the input frequency.
• A) one-half
• B) equal to
• C) twice
• D) one-quarter
23. What is the PIV for each diode in a full-wave center-tapped rectifier? Note: Vp(out) = peak output voltage.
• A) Vp(out) – 0.7 V
• B) Vp(out) + 0.7 V
• C) 2Vp(out) – 0.7 V
• D) 2Vp(out) + 0.7 V
24. In the operation of a half-wave rectifier with a capacitor-input filter, the ripple factor can be lowered by _____ the value of the filter capacitor or _____ the load resistors.
• A) decreasing, decreasing
• B) decreasing, increasing
• C) increasing, decreasing
• D) increasing, increasing
25. What type of diode circuit is used to clip off portions of signal voltages above or below certain levels?
• A) clipper or limiter
• B) clamper
• C) IC voltage regulator
• D) none of the above
26. What type of diode circuit is used to add or restore a dc level to an electrical signal?
• A) clipper or limiter
• B) clamper
• C) IC voltage regulator
• D) none of the above

27. What is the VRRM (PIV rating) for the 1N4001 rectifier diode?

• A) 50 V
• B) 100 V
• C) 200 V
• D) 400 V
• E) none of the above
28. How many terminals do the 7800 series fixed positive voltage regulators have?
• A) 2
• B) 3
• C) 4
• D) 5
• E) none of the above