 How Diodes Are Used – Gibilisco MCQs in Electronics

(Last Updated On: December 8, 2017) 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

• 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.