Acoustics, Audio, and High Fidelity – MCQs in Electronics

(Last Updated On: December 8, 2017)

Multiple choice questions in Acoustics, Audio, and High Fidelity

This is the Multiple Choice Questions (MCQs) in Chapter 31: Acoustics, Audio, and High Fidelity 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. Acoustics is important in the design of:

  • A. Amplifier power supplies.
  • B. Speaker enclosures.
  • C. Cables that connect components of a hi-fi system together.
  • D. Graphic equalizers.

2. Electromagnetic interference to a hi-fi amplifier can be caused by:

  • A. A nearby radio broadcast station.
  • B. Improperly designed receiving antennas.
  • C. Excessive utility voltage.
  • D. Improper balance between the left and right channels.

3. The midrange audio frequencies:

  • A. Are halfway between the lowest and highest audible frequencies.
  • B. Represent sounds whose volume levels are not too loud or too soft.
  • C. Are above the treble range but below the bass range.
  • D. Are between approximately 0.2 and 2 kHz.

4. An indoor concert hall such that sound reaches every listener’s ears perfectly at all audio frequencies requires:

  • A. A suspended ceiling with acoustical tile completely covering it.
  • B. Numerous baffles on the walls and ceiling.
  • C. A level of engineering beyond reasonable expectation.
  • D. Avoidance of excessive background noise.

5. A sound volume change of -3 dB represents:

  • A. A doubling of acoustic power.
  • B. A threefold increase in acoustic power.
  • C. A tenfold increase in acoustic power.
  • D. No change in acoustic power.

6. A sound whose wavelength is 6in in the air has a frequency of:

  • A. 550 Hz.
  • B. 1100 Hz.
  • C. 2200 Hz.
  • D. It is impossible to calculate from this information.

7. A sound wave that travels at 335 m per second has a frequency of:

  • A. 335 Hz.
  • B. 3350 Hz.
  • C. 33.5 Hz.
  • D. It is impossible to calculate from this information.

8. The relative phase of two acoustic waves, as they arrive at your ears, can affect:

  • A. How loud the sound seems.
  • B. The direction from which the sound seems to be coming.
  • C. Both A and B.
  • D. Neither A nor B.

9. In an acoustic sine wave:

  • A. The frequency and phase are identical.
  • B. The sound power is inversely proportional to the frequency.
  • C. The sound power is directly proportional to the frequency.
  • D. All of the sound power is concentrated at a single frequency.

10. Vinyl disks are:

  • A. Susceptible to physical damage.
  • B. Useful primarily in high-power sound systems.
  • C. Digital media.
  • D. Preferred for off-the-air sound recording.

11. If an amplifier introduces severe distortion in the waveforms of input signals, then that amplifier is:

  • A. Not delivering enough power.
  • B. Operating at the wrong frequency.
  • C. Operating in a nonlinear fashion.
  • D. Being underdriven.

12. If a 10-watt amplifier is used with speakers designed for a 100-watt amplifier:

  • A. The speakers are capable of handling the amplifier output.
  • B. The amplifier might be damaged by the speakers.
  • C. Electromagnetic interference is likely to occur.
  • D. The speakers are likely to produce distortion of the sound.

13. Which of the following frequencies cannot be received by an AM/FM tuner?

  • A. 830 kHz.
  • B. 95.7 kHz.
  • C. 100.1 MHz.
  • D. 107.3 MHz.

14. A woofer:

  • A. Is especially useful for reproducing the sounds of barking dogs.
  • B. Is designed to handle short, intense bursts of sound.
  • C. Should not be used with a graphic equalizer.
  • D. Is designed to reproduce low-frequency sounds.

15. Suppose you have an amateur radio station and its transmitter causes EMI to your hi-fi system. Which of the following would almost certainly not help?

  • A. Buy a radio transmitter that works on the same frequencies with the same power output, but is made by a different manufacturer.
  • B. Reduce the transmitter output power.
  • C. Use shielded speaker wires in the hi-fi system.
  • D. Move the radio transmitting antenna to a location farther away from the hi-fi system.

16. A tape recording head:

  • A. Converts sound waves to radio signals.
  • B. Converts sound waves to fluctuating electric current.
  • C. Converts audio-frequency currents to a fluctuating magnetic field.
  • D. Converts direct current to audio-frequency currents.

17. A microphone:

  • A. Converts sound waves to radio signals.
  • B. Converts sound waves to fluctuating electric current.
  • C. Converts audio-frequency currents to a fluctuating magnetic field.
  • D. Converts direct current to audio-frequency currents.

18. An audio mixer:

  • A. Cannot match impedances.
  • B. Cannot make an amplifier more powerful.
  • C. Will eliminate EMI.
  • D. Allows a microphone to be used as a speaker.

19. Which of the following media or devices use digital-to-analog conversion?

  • A. A CD player.
  • B. A speaker.
  • C. A microphone.
  • D. A vinyl disk.

20. Phase quadrature is sometimes used to:

  • A. Increase the output from a microphone.
  • B. Reduce the susceptibility of a hi-fi system to EMI.
  • C. Create the illusion of four-channel stereo when there are really only two channels.
  • D. Convert an analog signal to a digital signal, or vice-versa.

Complete List of Multiple Choice Questions from this Book

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Acoustics, Audio, and High Fidelity – MCQs in Electronics
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