Acoustics

Question 1

Which surface finish provides the greatest NRC?
A.) plaster
B.) acoustical ceiling tile
C.) 1/4" pile carpet
D.) 1/2" pile carpet

Answer 1

B.) acoustical ceiling tile

Question 2

Which ceiling system would you use to accommodate acoustical ceiling tile, light fixtures, supply and return air grilles, fire sprinklers and partitions attachments in a consistent, unified way?
A.) integrated ceiling system
B.) demountable ceiling system
C.) suspended ceiling
D.) grid ceiling system

Answer 2

A.) integrated ceiling system

Question 3

All of the following are true about suspended acoustical ceilings EXCEPT?
A.) is perforated or fissured in various ways to absorb sound
B.) consists of thin panels of wood fiber, mineral fiber or glass fiber set in a support grid of metal framing
C.) prevent sound transmission to an appreciable extent
D.) offer easy access to electrical and mechanical components in the plenum

Answer 3

C.) prevent sound transmission to an appreciable extent

Question 4

Acoustic glass is also known as:

Answer 4

laminated glass

Question 5

What would be the easiest way to increase the IIC value of a conference room floor?
A.) providing sound-batting in the air space between the floor and the finished ceiling below
B.) providing a resiliently suspended ceiling below
C.) providing a thick flooring at least 1/8” thick
D.) carpeting the floor

Answer 5

D.) carpeting the floor

Question 6

Which is the most correct statement about acoustic quality?
A.) A good acoustic material absorbs all frequencies equally.
B.) A desirable goal of acoustic design is to eliminate all background noise.
C.) Sound of 50 dB is twice as loud as a sound of 25dB.
D.) A 7 dB reduction of the noise within a room would be clearly noticeable.

Answer 6

A 7 dB reduction of the noise within a room would be clearly noticeable.

Anything above 5 db is noticable

Question 7

If a material supplier says that adding his product to a wall assembly in a critical acoustic situation would increase the noise reduction (STC rating) between two rooms by slightly more than 3 dB, what should the designer’s reaction be?
A.) Thank them for stopping by, but explain that the amount of noise reduction is nominal
B.) Ask if some modification can be made to the product to increase its rating to 6 dB
C.) Determine what the additional cost would be and then decide whether or not to use the product
D.) Specify it as long as it does not affect the construction cost by more than 5%

Answer 7

A.) Thank them for stopping by, but explain that the amount of noise reduction is nominal

Question 8

The absorption of material is defined by the ratio of the sound intensity absorbed by the material to the total intensity reaching the material.
This is called the:

Answer 8

coefficient of absorption