Sound and Audio Fundamentals
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Questions and Answers

What is the term for the rate at which vibrations occur in sound?

  • Frequency (correct)
  • Wavelength
  • Amplitude
  • Displacement
  • What type of waves do sound travels through the air as?

  • Transverse waves
  • Longitudinal waves (correct)
  • Electromagnetic waves
  • Mechanical waves
  • What is the range of frequencies that the human ear can detect?

  • 10 Hz to 10 000 Hz
  • 1 Hz to 1 000 Hz
  • 20 Hz to 20 000 Hz (correct)
  • 100 Hz to 100 000 Hz
  • What is the term for the compression of air particles when a vibrating surface moves closer to them?

    <p>Compressions (C)</p> Signup and view all the answers

    What is the minimum particle displacement that the human ear can detect?

    <p>0.0000001 millimeters (A)</p> Signup and view all the answers

    Why are intercom systems necessary in aircraft?

    <p>To reduce the noise in the cockpit area (D)</p> Signup and view all the answers

    What is a common characteristic of intercom and telephone systems?

    <p>They allow both persons to talk and listen at the same time (A)</p> Signup and view all the answers

    What is the purpose of an antenna in a radio transmission system?

    <p>To generate an EM field (C)</p> Signup and view all the answers

    What type of current is required to produce an expanding and collapsing EM field?

    <p>AC current (B)</p> Signup and view all the answers

    What determines the required length of an antenna for effective transmission?

    <p>The frequency of the signal to be transmitted (D)</p> Signup and view all the answers

    What is the range of frequencies for human voice in normal speech?

    <p>90 Hz to 10 kHz (C)</p> Signup and view all the answers

    What happens to the EM field when an electric current is transmitted along a conductor?

    <p>It develops an EM field (D)</p> Signup and view all the answers

    What is the wavelength of a carrier frequency of 10 megahertz?

    <p>30 meters (C)</p> Signup and view all the answers

    What is the primary method of rejecting noise in AM receivers?

    <p>There is no means of rejecting noise (C)</p> Signup and view all the answers

    What is the main advantage of frequency modulation over amplitude modulation?

    <p>It is more resistant to amplitude noise (C)</p> Signup and view all the answers

    What is the primary characteristic of the wave that is changed in amplitude modulation?

    <p>Amplitude (D)</p> Signup and view all the answers

    What is the primary method of modulating a radio wave?

    <p>Changing the frequency or amplitude (D)</p> Signup and view all the answers

    Why is frequency modulation used instead of amplitude modulation?

    <p>It is more resistant to amplitude noise (C)</p> Signup and view all the answers

    What is a limitation of satellite communication systems in aircraft?

    <p>High cost and space requirements (D)</p> Signup and view all the answers

    What is a characteristic of full duplex operation in aircraft communication systems?

    <p>Needs a full suite of hardware for both transmitter and receiver (D)</p> Signup and view all the answers

    How are satellite calls, mainly over water, connected to the public telephone network?

    <p>Through a satellite earth station (D)</p> Signup and view all the answers

    What is required to provide connectivity to each passenger seat in an aircraft?

    <p>Significant additional wiring and control boxes (D)</p> Signup and view all the answers

    What is the purpose of a transceiver in a passenger communication system?

    <p>To send information from the phone handset to the ground radio base station (C)</p> Signup and view all the answers

    What type of data can be transmitted through a radio link between an aircraft and the ground?

    <p>Virtually unlimited types of data (B)</p> Signup and view all the answers

    What is the primary factor that affects the range of HF radio transmissions?

    <p>Frequency selected and time of day (C)</p> Signup and view all the answers

    Why do aircraft HF transmitters typically have higher output power than VHF transmitters?

    <p>To achieve long-distance communications (C)</p> Signup and view all the answers

    What is the primary reason why jet aircraft rarely have long wire HF antennas?

    <p>They are not suitable for high-speed flight (D)</p> Signup and view all the answers

    What is the purpose of the weak point in an HF antenna installation?

    <p>To prevent damage or loss of control in case of breakage (C)</p> Signup and view all the answers

    What is the typical configuration of an HF antenna on a light aircraft?

    <p>From a wingtip to the tail and then down to the HF transceiver (B)</p> Signup and view all the answers

    What is the primary advantage of HF radios over VHF radios in aircraft communications?

    <p>Longer range and global coverage (C)</p> Signup and view all the answers

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