How Diodes Are Used - Gibilisco MCQs in Electronics

MCQs in How Diodes Are Used from the book Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco.

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.

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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.
• 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:

• 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.
• 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:

• 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.

Complete List of Multiple Choice Questions from this Book

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