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20-1. Wjat ratings are the most important in evaluating the acoustic quality of a floor and ceiling assembly?
I. STC
II. NRC
III. IIC
IV. NC
a. I and II
b. I and III
c. II and III
d. III and IV |
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20-2. If a meterial supplier says that adding his product to a wall assembly in a critical acoustic situation would increse the noise reduction (STC rating) between two rooms by slightly more than 3 db, what should th e designer's reaction be?
a. Determine what the additional cost would be and then decide whether or not to use the product.
b. Thank him for stopping by but explain that the amount of noise reuction his product provides does not make it worth the effort or cost.
c. Specify the product as long as it does not affect the construction cost by more than 5%
d. Inquire whether some modification can be made to the product to increase its rating to 6dB |
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| b. Thank him for stopping by but explain that the amount of noise reuction his product provides does not make it worth the effort or cost. |
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20-3. During the design development phase of design, what method would NOT be used to reduce potential noise problems in a room whose exact size and shape had not yet been determined?
a. Design the room to have the largest ceiling surface area possible
b. plan for sound-absorbent material on the walls of the room
c. Study ways to increase the transmission loss of the room's partitions
d. Minimize the length of the wall separating the room from noisier areas.
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| a. Design the room to have the largest ceiling surface area possible |
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20-4. Which partition will perform better acoustically
a. a thick, heavy, stiffer wall
b. a wall weighing the same amount as in a but more made of flexible materials? |
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| b. a wall weighing the same amount as in a but more made of flexible materials? |
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20-5. Which is the most accurate statement about sound?
a. a sound of 50 dB is twice as loud as a sound of 25dB.
b. A desirable goal of acoustic design is to eliminate all background noise
c. A 7 dB reduction of the noise within a room would be clearly noticeable
d. A good acoustic material absorbs all frequencies equally |
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| c. A 7 dB reduction of the noise within a room would be clearly noticeable |
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20-6. To detail a doorframe for a conference room where privacy is critical, which of the following is LEAST likely to be required?
a. an automatic door bottom
b. a heavy-duty silent door closer
c. neoprene gasketing
d. a solid-core door |
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| b. a heavy-duty silent door closer |
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20-7. Insulation is used in interior walls to
a. prevent heat transmission from one side to the other
b. improve the strength of the wall
c. improve the acoustic characteristics of the wall
d. increase the fire resistance of the wall |
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| c. improve the acoustic characteristics of the wall |
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20-8. Changing a ceiling from gypsum wallboard to acoustic tile would most affect the room's
a. reverberation
b. sound transmission
c. decibel loss
d. impact insulation class |
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20-9. In a small lecture hall, it would be best to avoid
a. a sound amplification system
b. a vaulted ceiling
c. carpet
d. parallel walls |
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20-10. Which of the following is NOT true about noise reduction between two rooms?
a. Noise reduction increases with an increase in the transmission loss of the wall separating the two rooms
b. The stiffness of the wall can affect noise reduction
c. To improve noise reduction, the designer should place absorptive materials on both sides of the wall
d. An increase in wall area separatiung the two rooms is detrimental. |
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| c. To improve noise reduction, the designer should place absorptive materials on both sides of the wall |
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