ARE Study Review

What does a 1.0 sabin indicate about the absorptivity per square foot of a surface?

Which is true?  A. The level of airborne noise that passes through either a floor/ceiling or wall assembly at a specific location produces an IIC rating.  B. The level of airborne noise that passes through either a floor/ceiling or wall assembly at a specific location gives an STC rating.  C. Sound transmission occurring due to impact noise transferring through a floor-ceiling assembly gives an IIC rating.  D. Sound transmission occurring due to impact noise transferring through a floor-ceiling assembly produces an STC rating.

Which of the following acronyms expresses the level of continuous or ambient noise in indoor environments that is acceptable to the subject (receiver)? A. STC, B. NR, C. PNC, D . NRC, E. INR

Match the following statement Rapid succession of echoes as the result of sound waves reflecting back and forth between two parallel surfaces A. focusing B. diffraction C. reverberation D. flutter E. resonance F. attenuation Answer D. flutter - can sound like separate signals because of the amount of time between each reflection. ARE 4.0 exam prep: BS

Doubling the distance from the source of a sound reduces noise intensity (I) by: A. one quarter B. one half C. double D. nothing Answer A. one quarter ARE 4.0 exam prep: SPD

Which of the following building layout strategies would one consider to reduce noise? I. provide separation of all quiet areas from sources of noise II. locate mechanical rooms near noise sources III. locate storage rooms away from noise source IV. place openings close to noise sources V. locate all doors away from noise sources A. I, II, III B. II, IV, V C. I, II, V D. III, V Answer C. I, II, V: locate quiet areas and openings (incl doors) away from noise source and locate mech areas near the noise. ARE 4.0 exam prep: SD

What should the average height (H) in feet be for an auditorium whose desired reverberation time, not using drapes, is 1.20 seconds (T R )? Answer H = 20 x 1.2 = 24 feet, average height. ARE 4.0 exam prep: BS

Which can be said to be higher in a very thick wall assembly? A. STC B. NRC Answer A. STC - sound transmission class is applied to wall assemblies, whereas NRC (noise reduction coefficient) is applied to the absorptive qualities of materials." ARE 4.0 exam prep: BS

The average person sitting in an open office may begin to experience difficulty carrying on a telephone conversation once the loudness of the office reaches: A. 60 dB B. 80 dB C. 100 dB D. 120 dB Answer B. 80 dB is the level of a noisy office or average factory and renders the phone difficult to use. ARE 4.0 exam prep PPP

A double-loaded corridor in a hotel contains a series of doors to the guest rooms on both sides. What simple strategy can interrupt the path for noise along this corridor? Answer Staggering the doorway placement along the corridor breaks a straight-line path for noise to travel between rooms on opposing sides. ARE 4.0 exam prep: BS

What are some common design strategies used to control noise from mechanical equipment? Answer Isolation hangers for suspended piping, flexible duct connections, flexible conduit with looped connection, lined ducts, slab penetrations packed with glass fiber & sealant both sides, motor bases supported by stl springs on neoprene pads.

Which is a more effective placement for absorptive materials in a small room? A. ceiling B. walls Answer

A barrier with which STC rating below provides the best ability to control sound transmission? A. 50 B. 35 C. 25 Answer

In subjective evaluation terms, 70 dB is considered loud. Which of the following types of sound have this level of intensity? A. loud street noise B. kitchen blender C. average conversation D. average radio E. average street noise I. A, B II. D, E III. C, D IV. none of the above Answer II. Average radio and average street noise are about 70dB. Loud street noise and kitchen blender are commonly 90 dB (very loud) and the average conversation is moderate at 50 dB. ARE 4.0 exam prep: BS