# Floyd Self-test in Diodes and Applications

(Last Updated On: December 8, 2017)

This is the Self-test in Chapter 2: Diodes and Applications from the book Electronic Devices Conventional Current Version, 9th edition by Thomas L. Floyd. If you are looking for a reviewer in Electronics Engineering this will definitely help you before taking the Board Exam.

### Floyd Self-test Chapter 2 Topic Outline

• Floyd Self-test in Diode Operation
• Floyd Self-test in Voltage-Current (V-I) Characteristics of a Diode
• Floyd Self-test in Diode Models
• Floyd Self-test in Half-Wave Rectifiers
• Floyd Self-test in Full-Wave Rectifiers
• Floyd Self-test in Power Supply Filters and Regulators
• Floyd Self-test in Diode Limiters and Clampers
• Floyd Self-test in Voltage Multipliers
• Floyd Self-test in The Diode Datasheet

### Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. The average value of a half-wave rectified voltage with a peak value of 200 V is

• (a) 63.7 V
• (b) 127.2 V
• (c) 141 V
• (d) 0 V

2. When a 60 Hz sinusoidal voltage is applied to the input of a half-wave rectifier, the output frequency is

• (a) 120 Hz
• (b) 30 Hz
• (c) 60 Hz
• (d) 0 Hz

3. The peak value of the input to a half-wave rectifier is 10 V. The approximate peak value of the output is

• (a) 10 V
• (b) 3.18 V
• (c) 10.7 V
• (d) 9.3 V

4. For the circuit in the previous question, the diode must be able to withstand a reverse voltage of

• (a) 10 V
• (b) 5 V
• (c) 20 V
• (d) 3.18 V

5. The average value of a full-wave rectified voltage with a peak value of 75 V is

• (a) 53 V
• (b) 47.8 V
• (c) 37.5 V
• (d) 23.9 V

6. When a 60 Hz sinusoidal voltage is applied to the input of a full-wave rectifier, the output frequency is

• (a) 120 Hz
• (b) 60 Hz
• (c) 240 Hz
• (d) 0 Hz

7. The total secondary voltage in a center-tapped full-wave rectifier is 125 V rms. neglecting the diode drop, the rms output voltage is

• (a) 125 V
• (b) 177 V
• (c) 100 V
• (d) 62.5 V

8. When the peak output voltage is 100 V, the PIV for each diode in a center-tapped full-wave rectifier is (neglecting the diode drop)

• (a) 100 V
• (b) 200 V
• (c) 141 V
• (d) 50 V

9. When the rms output voltage of a bridge full-wave rectifier is 20 V, the peak inverse voltage across the diodes is (neglecting the diode drop)

• (a) 20 V
• (b) 40 V
• (c) 28.3 V
• (d) 56.6 V

10. The ideal dc output voltage of a capacitor-input filter is equal to

• (a) the peak value of the rectified voltage
• (b) the average value of the rectified voltage
• (c) the rms value of the rectified voltage

11. A certain power-supply filter produces an output with a ripple of 100 mV peak-to-peak and adc value of 20 V. The ripple factor is

• (a) 0.05
• (b) 0.005
• (c) 0.00005
• (d) 0.02

12. A 60 V peak full-wave rectified voltage is applied to a capacitor-input filter. If f = 120 Hz, RL= 10 kΩ, and C = 10µF, the ripple voltage is

• (a) 0.6 V
• (b) 6 mV
• (c) 5.0 V
• (d) 2.88 V

13. If the load resistance of a capacitor-filtered full-wave rectifier is reduced, the ripple voltage

• (a) increases
• (b) decreases
• (c) is not affected
• (d) has a different frequency

14. Line regulation is determined by

• (a) load current
• (b) zener current and load current
• (c) changes in load resistance and output voltage
• (d) changes in output voltage and input voltage

15. Load regulation is determined by

• (a) changes in load current and input voltage
• (b) changes in load current and output voltage
• (c) changes in load resistance and input voltage
• (d) changes in zener current and load current

16. A 10 V peak-to-peak sinusoidal voltage is applied across a silicon diode and series resistor. The maximum voltage across the diode is

• (a) 9.3 V
• (b) 5 V
• (c) 0.7 V
• (d) 10 V
• (e)4.3 V

17. In a certain biased limiter, the bias voltage is 5 V and the input is a 10 V peak sine wave. If the positive terminal of the bias voltage is connected to the cathode of the diode, the maximum voltage at the anode is

• (a) 10 V
• (b) 5 V
• (c) 5.7 V
• (d) 0.7 V

18. In a certain positive clamper circuit, a 120 V rms sine wave is applied to the input. The dc value of the output is

• (a)119.3 V
• (b) 169 V
• (c) 60 V
• (d) 75.6 V

19. If the input voltage to a voltage tripler has an rms value of 12 V, the dc output voltage is approximately

• (a) 36 V
• (b) 50.9 V
• (c) 33.9 V
• (d) 32.4 V

20. In a rectifier circuit, if the secondary winding in the transformer opens, the output is

• (a) 0 V
• (b) 120 V
• (c) less than it should be
• (d) unaffected

21. If one of the diodes in a bridge full-wave rectifier opens, the output is

• (a) 0 V
• (b) one-fourth the amplitude of the input voltage
• (c) a half-wave rectified voltage
• (d) a 120 Hz voltage

22. If you are checking a 60 Hz full-wave bridge rectifier and observe that the output has a 60 Hz ripple,

• (a) the circuit is working properly
• (b) there is an open diode
• (c) the transformer secondary is shorted
• (d) the filter capacitor is leaky

### Check your work.

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