Term
| 1. The goal of architectural acoustics is as follows: |
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Definition
| b) design spaces to meet hearing needs |
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Term
| 2. The critical frequency range for human speech communication is: |
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Definition
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Term
| 3. Human beings can hear sounds with frequencies ranging from: |
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Definition
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Term
| 4. In architectural acoustics, frequency is sometimes referred to as: |
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Definition
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Term
| 5. Which of the following terms does not relate to sound magnitude: |
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Definition
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Term
| 6. The decibel is best defined as the following: |
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Definition
| a) a numerical scale devised to conveniently describe sound magnitude |
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Term
. Sound intensity level changes by 3 dB with every doubling or halving of power and
changes by ____ dB with every doubling or halving of the distance from a point
source. |
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Definition
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Term
8. A typical sound pressure level (dBA) for human breathing is 10, and for a jet plane
takeoff is 150. The threshold of discomfort is about ____ dBA |
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Definition
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Term
| 9. The following is not a definition of noise: |
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Definition
| d) sound outside of the normative frequency ranges |
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Term
10. Which of the following is not a correct conclusion regarding annoyance as a result of
noise. Annoyance is: |
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Definition
d) greater for nonsense noise (foreign language) than information-bearing
noise (a neighbor’s radio) |
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Term
11. Prolonged exposure to high noise levels can lead to hearing loss. Which of the
following US-based agencies publishes acceptable noise exposure limits for workers. |
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Definition
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Term
The Articulation Index (AI) is determined by reading a carefully selected set of
phonetically balanced nonsense syllables to a test audience in the presence of
different levels of background noise. An AI (ratio of correctly identified syllables to
total syllables) of ____ is usually deemed an acceptable level of intelligibility for a
male voice. |
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Definition
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Term
A. A tone with a sound pressure level of 84 dB at 100 Hz frequency would sound
equally as loud as a tone of:
___ db at 40 Hz 97
___ dB at 200 Hz 79
___ dB at 1000 Hz 80
___ dB at 2000 Hz 77
___ dB at 4000 Hz 70 |
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Definition
_97__ db at 40 Hz
79_ dB at 200 Hz 79
_80__ dB at 1000 Hz
__77_ dB at 2000 Hz
70 dB at 4000 Hz |
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Term
B. What is the combined sound pressure level for the following situations:
40 dB + 40 dB 43 dB
52 dB + 50 dB 54 dB
52 dB + 58 dB 59 dB
55 dB + 40 dB 55 dB |
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Definition
40 dB + 40 dB _43 dB_
52 dB + 50 dB _54 dB_
52 dB + 58 dB _59 dB_
55 dB + 40 dB _55 dB_ |
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Term
| 1. The two primary acoustical characteristics of an enclosed space are: |
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Definition
| d) absorption and reverberation |
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Term
| 2. The term used to define a material’s sound absorption characteristic is: |
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Definition
| b) coefficient of absorption |
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Term
3. Reverberation is the persistence of sound after a sound source has ceased. Such
persistence of sound is a result of: |
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Definition
|
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Term
4. Reverberation time (TR) is defined as the time required for the sound pressure level
to decrease ____ dB after the sound source has stopped producing sound. |
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Definition
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Term
5. The converse of reverberation is articulation. An articulate environment keeps each
sound event separate rather than running them together. Spaces for speech
activities should be: |
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Definition
| b) more articulate, less reverberant |
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Term
| 6. Most indoor spaces contain the following sound fields: |
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Definition
| c) a near field, a reverberant field, and a free field |
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Term
7. Sound power level (PWL) is a measure of the amount of sound generated by a
source _____ of its environment. |
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Definition
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Term
| 8. The noise reduction coefficient (NRC) is: |
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Definition
| a) an arithmetic average of absorption coefficients at four frequencies |
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Term
9. The optimum reverberation time in seconds, for speech, can be approximated using
a formula based on the _____ of the space. |
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Definition
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Term
10. Concave domes, vaults, or walls will lead reflected sound into certain areas of a
room. This is called: |
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Definition
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Term
11. _______ is a design procedure for analyzing the reflected sound distribution
throughout a hall using the first reflection only. |
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Definition
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Term
| 12. Generally, sound amplification systems will be required in spaces larger than ____ft2 (m2). |
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Definition
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Term
| 1. The process of converting acoustical energy into heat is called: |
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Definition
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Term
| 2. Absorption techniques are generally useful and effective: |
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Definition
| b) to change room reverberation characteristics |
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Term
| 3. Structure-borne sound transmission is generally ______ than airborne sound. |
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Definition
| c) more difficult to control |
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Term
| 4. The noise reduction (NR) between two spaces separated by a barrier is defined as: |
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Definition
| b) the difference between the sound intensity levels in the two rooms |
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Term
| 5. The mass law is based on the principle that: |
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Definition
| a) the larger the mass, the less it will vibrate |
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Term
| 6. Stiffness in a panel construction reduces damping, making it a good ______ |
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Definition
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Term
| 7. The stiffness of a barrier is a function of its ______ and the rigidity of its mounting. |
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Definition
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Term
8. Transmission loss for a cavity wall increases with the width of the air space at the
rate of 5 dB per doubling. Performance can be improved still further by: |
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Definition
| d) filling the void with porous, sound-absorbent material |
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Term
9. ______ is a function of the degree of sound isolation provided by the barriers
between rooms and the ambient sound level in the receiving room. |
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Definition
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Term
| 10. An AI (Articulation Index) of 0 indicates: |
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Definition
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Term
11. Which of the following is not a reason that impact noise is at least as serious a
problem as airborne noise: |
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Definition
| a) resilient cushioning materials eliminate vibration |
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Term
| 12. Which of the following is not a form of isolation for structure-borne sound. |
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Definition
| b) reducing mechanical equipment sound power |
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