Acoustics Lecture Topics III Sound Reinforcement Systems Quiz

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Questions and Answers

What can be used to reduce noise impinging on a building without resorting to costly sound insulation?

  • Metal roofing
  • Glass windows
  • Earth embankment (correct)
  • Masonry garden wall

What type of structures act as sound absorbers and reflectors?

  • Hedges of trees with dense foliage (correct)
  • Concrete walkways
  • Brick buildings
  • Houses with metal roofs

Where is it advantageous to place the speakers platform in a building?

  • Opposite to the street
  • At the center of the room
  • In the basement
  • At the end of the room adjacent to the street (correct)

What is the science of converting acoustical energy into another form of energy?

<p>Noise reduction (D)</p>
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Which part of a building layout has a bearing on noise control?

<p>Location of doors and windows (D)</p>
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What type of construction can help in noise reduction through absorption?

<p>Cavity Walls (D)</p>
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What aspect of hedges contributes to their effectiveness as sound absorbers and reflectors?

<p>Thickness, height, and density of growth (B)</p>
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What is the purpose of a sound reinforcement system?

<p>To amplify the original sound (B)</p>
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In an ideal sound system, what should the frequency response be like?

<p>It should be linear to retain original sound relation (D)</p>
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What characteristic ensures that sound appears to come from the originating source?

<p>Directivity (A)</p>
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When might a sound system typically be required based on the text?

<p>In spaces larger than 50,000 cu.ft. or 550 persons (B)</p>
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Which of the following is NOT a basic element of all sound systems?

<p>Lighting Systems (C)</p>
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What are examples of input devices mentioned in the text?

<p>Microphone, Phonograph, Cassette deck (B)</p>
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Which component is responsible for boosting the input signal in a sound system?

<p>Amplifier(s) (B)</p>
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What is the principal mechanism through which sound is transmitted through a rigid partition?

<p>Forced vibrations of the wall (A)</p>
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Why does double-wall construction offer high insulation?

<p>Cavity between walls (B)</p>
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What are usually considered the paths of least resistance in sound insulation of a room?

<p>Windows and doors (D)</p>
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How can the average transmission loss of a window be primarily improved?

<p>Increasing the thickness of the pane (A)</p>
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What factor contributes to the increased transmission loss of a door?

<p>Increased weight (B)</p>
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According to the rule for noise insulation requirements, what should be added to the difference between outside noise level and acceptable noise level?

<p>+10 db (A)</p>
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What is the formula for determining the noise-insulation factor required for satisfactory noise insulation?

<p>(Outside noise level - Acceptable noise level) + 10 db (B)</p>
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Which construction method frequently offers high insulation at moderate cost?

<p>Double-wall construction (B)</p>
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What is the purpose of adding 10 dB in noise insulation?

<p>To reduce the overall noise level (D)</p>
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What is one of the beneficial effects of installing acoustical materials in a room?

<p>Reducing the reverberation time (D)</p>
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In what types of spaces are absorption techniques recommended?

<p>Spaces with hard surfaces and little absorptive content (C)</p>
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What is a characteristic of noise localization achieved by acoustical materials?

<p>Attenuating nearby noise sources more than distant ones (C)</p>
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Why are absorption techniques effective in certain spaces?

<p>To change room reverberation characteristics (A)</p>
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What is one reason for installing acoustical materials in offices?

<p>To reduce the overall reverberation time (D)</p>
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What is the speed of vibration through a solid building structure compared to sound in air?

<p>Ten times faster than sound in air (C)</p>
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Which of the following materials is recommended to reduce impact transmission to the floor?

<p>Cork tile on felt (B)</p>
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What is the primary source of solid-borne noise?

<p>Impacts or machinery vibration (D)</p>
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What is the purpose of using heavy carpeting in sound reduction?

<p>To reduce impact transmission to the floor (C)</p>
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Which of the following is NOT mentioned as a measure for solid-borne sound reduction?

<p>Plastic piping (A)</p>
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What does the table provide ratings for in terms of floor constructions?

<p>Comparisons between various floor materials laid on a concrete slab (C)</p>
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How does solid-borne noise typically travel through a building structure?

<p>Faster than vibrations in air (A)</p>
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Which material is not recommended in the text for reducing solid-borne noise transmission?

<p>Thin plastic sheets (C)</p>
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