Acoustics Lecture Topics III Sound Reinforcement Systems Quiz

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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?

Noise reduction Signup and view all the answers

Which part of a building layout has a bearing on noise control?

Location of doors and windows Signup and view all the answers

What type of construction can help in noise reduction through absorption?

Cavity Walls Signup and view all the answers

What aspect of hedges contributes to their effectiveness as sound absorbers and reflectors?

Thickness, height, and density of growth Signup and view all the answers

What is the purpose of a sound reinforcement system?

To amplify the original sound Signup and view all the answers

In an ideal sound system, what should the frequency response be like?

It should be linear to retain original sound relation Signup and view all the answers

What characteristic ensures that sound appears to come from the originating source?

Directivity Signup and view all the answers

When might a sound system typically be required based on the text?

In spaces larger than 50,000 cu.ft. or 550 persons Signup and view all the answers

Which of the following is NOT a basic element of all sound systems?

Lighting Systems Signup and view all the answers

What are examples of input devices mentioned in the text?

Microphone, Phonograph, Cassette deck Signup and view all the answers

Which component is responsible for boosting the input signal in a sound system?

Amplifier(s) Signup and view all the answers

What is the principal mechanism through which sound is transmitted through a rigid partition?

Forced vibrations of the wall Signup and view all the answers

Why does double-wall construction offer high insulation?

Cavity between walls Signup and view all the answers

What are usually considered the paths of least resistance in sound insulation of a room?

Windows and doors Signup and view all the answers

How can the average transmission loss of a window be primarily improved?

Increasing the thickness of the pane Signup and view all the answers

What factor contributes to the increased transmission loss of a door?

Increased weight Signup and view all the answers

According to the rule for noise insulation requirements, what should be added to the difference between outside noise level and acceptable noise level?

+10 db Signup and view all the answers

What is the formula for determining the noise-insulation factor required for satisfactory noise insulation?

(Outside noise level - Acceptable noise level) + 10 db Signup and view all the answers

Which construction method frequently offers high insulation at moderate cost?

Double-wall construction Signup and view all the answers

What is the purpose of adding 10 dB in noise insulation?

To reduce the overall noise level Signup and view all the answers

What is one of the beneficial effects of installing acoustical materials in a room?

Reducing the reverberation time Signup and view all the answers

In what types of spaces are absorption techniques recommended?

Spaces with hard surfaces and little absorptive content Signup and view all the answers

What is a characteristic of noise localization achieved by acoustical materials?

Attenuating nearby noise sources more than distant ones Signup and view all the answers

Why are absorption techniques effective in certain spaces?

To change room reverberation characteristics Signup and view all the answers

What is one reason for installing acoustical materials in offices?

To reduce the overall reverberation time Signup and view all the answers

What is the speed of vibration through a solid building structure compared to sound in air?

Ten times faster than sound in air Signup and view all the answers

Which of the following materials is recommended to reduce impact transmission to the floor?

Cork tile on felt Signup and view all the answers

What is the primary source of solid-borne noise?

Impacts or machinery vibration Signup and view all the answers

What is the purpose of using heavy carpeting in sound reduction?

To reduce impact transmission to the floor Signup and view all the answers

Which of the following is NOT mentioned as a measure for solid-borne sound reduction?

Plastic piping Signup and view all the answers

What does the table provide ratings for in terms of floor constructions?

Comparisons between various floor materials laid on a concrete slab Signup and view all the answers

How does solid-borne noise typically travel through a building structure?

Faster than vibrations in air Signup and view all the answers

Which material is not recommended in the text for reducing solid-borne noise transmission?

Thin plastic sheets Signup and view all the answers