This is the Multiple Choice Questions (MCQs) in Chapter 20: How Diodes Are Used from the book Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco. If you are looking for a reviewer in Electronics Engineering this will definitely help you before taking the Board Exam.
Start Practice Exam Test Questions
1. When a diode is forward-biased, the anode:
- A. Is negative relative to the cathode.
- B. Is positive relative to the cathode.
- C. Is at the same voltage as the cathode.
- D. Alternates between positive and negative relative to the cathode.
2. If ac is applied to a diode, and the peak ac voltage never exceeds the avalanche voltage, then the output is:
- A. Ac with half the frequency of the input.
- B. Ac with the same frequency as the input.
- C. Ac with twice the frequency of the input.
- D. None of the above.
3. A crystal set:
- A. Can be used to transmit radio signals.
- B. Requires a battery with long life.
- C. Requires no battery.
- D. Is useful for rectifying 60-Hz ac.
4. A diode detector:
- A. Is used in power supplies.
- B. Is employed in some radio receivers.
- C. Is used commonly in high-power radio transmitters.
- D. Changes dc into ac.
5. If the output wave in a circuit has the same shape as the input wave, then:
- A. The circuit is linear.
- B. The circuit is said to be detecting.
- C. The circuit is a mixer.
- D. The circuit is a rectifier.
6. The two input frequencies of a mixer circuit are 3.522 MHz and 3.977 MHz. Which of the following frequencies might be used at the output?
- A. 455 kHz.
- B. 886 kHz.
- C. 14.00 MHz.
- D. 1.129 MHz.
7. A time-domain display might be found in:
- A. An ammeter.
- B. A spectrum analyzer.
- C. A digital voltmeter.
- D. An oscilloscope.
8. Zener voltage is also known as:
- A. Forward breakover voltage.
- B. Peak forward voltage.
- C. Avalanche voltage.
- D. Reverse bias.
9. The forward breakover voltage of a silicon diode is:
- A. About 0.3 V.
- B. About 0.6 V.
- C. About 1.0 V.
- D. Dependent on the method of manufacture.
10. A diode audio limiter circuit:
- A. Is useful for voltage regulation.
- B. Always uses Zener diodes.
- C. Rectifies the audio to reduce distortion.
- D. Can cause objectionable signal distortion.
11. The capacitance of a varactor varies with:
- A. Forward voltage.
- B. Reverse voltage.
- C. Avalanche voltage.
- D. Forward breakover voltage.
12. The purpose of the I layer in a PIN diode is to:
- A. Minimize the diode capacitance.
- B. Optimize the avalanche voltage.
- C. Reduce the forward breakover voltage.
- D. Increase the current through the diode.
13. Which of these diode types might be found in the oscillator circuit of a
microwave radio transmitter?
- A. A rectifier diode.
- B. A cat whisker.
- C. An IMPATT diode.
- D. None of the above.
14. A Gunnplexer can be used as a:
- A. Communications device.
- B. Radio detector.
- C. Rectifier.
- D. Signal mixer.
15. The most likely place you would find an LED would be:
- A. In a rectifier circuit.
- B. In a mixer circuit.
- C. In a digital frequency display.
- D. In an oscillator circuit.
16. Coherent radiation is produced by a:
- A. Gunn diode.
- B. Varactor diode.
- C. Rectifier diode.
- D. Laser diode.
17. You want a circuit to be stable with a variety of amplifier impedance
conditions. You might consider a coupler using:
- A. A Gunn diode.
- B. An optoisolator.
- C. A photovoltaic cell.
- D. A laser diode.
18. The power from a solar panel depends on all of the following except:
- A. The operating frequency of the panel.
- B. The total surface area of the panel.
- C. The number of cells in the panel.
- D. The intensity of the light.
19. Emission of energy in an IRED is caused by:
- A. High-frequency radio waves.
- B. Rectification.
- C. Electron energy-level changes.
- D. None of the above.
20. A photodiode, when not used as a photovoltaic cell, has:
- A. Reverse bias.
- B. No bias.
- C. Forward bias.
- D. Negative resistance.
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