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Noise and Vibration Control


Quiz Questions

1.Conversion of acoustic energy to heat energy or another form of energy within the medium of sound-absorbing materials is called ________________.
Absorption
Adsorption
2. The most frequently encountered noise sources in a ducted air distribution system designed to deliver a constant volume of air are fans, control dampers, and air outlets such as diffusers, grilles, and registers.
True
False
3.What does SIL stand for?
Speech Interference Levels
Speed Interactive Level
Speech Interference Load
None of the above
4.Rain, mist, fog, hail, sleet, and snow are the various forms of _______________.
Precipitation
Temperature
5.Felt strips or pads are effective for reducing structure borne sound transmission in the mounting of piping and vibrating conduit.
True
False
6.What does VAV stand for?
Variable Air Valves
Variety Air Valves
Variable Agency Valves
None of the above
7.Ten times the common logarithm to the base 10 of the ratio of the mean square sound pressure to the square of a reference pressure is called Sound Power Level.
True
False
8.________________ is defined as the number of cycles occurring per second.
Frequency
Wavelength
9.The arithmetic average of several related sound levels (or SPL in a specified frequency band) measured at different positions or different times, or both are called Average Sound levels.
True
False
10.What does ASHRAE stand for?
American Society of Heating, Refrigerating, and Air-Conditioning Engineers
American Standard of Heating, Refining, and Air-Conditioning Engineers
American Standard of Heating, Refrigerating, and Air-Conditioning Engineers
None of the above
11.__________ is defined as a unit for expressing the relative power level difference between acoustical or electrical signals.
Decibel
Power
12.Field Sound Transmission is the ratio of the airborne sound power incident on the partition to the sound power transmitted by the partition.
True
False
13.What does ASTM stand for?
American Society for Testing and Materials
American Society for Transportation and Materials
American Standard for Testing and Materials
None of the above
14. ________________ is the ratio of sound energy absorbed by the acoustical material to that absorbed by a perfect absorptive material.
Absorption coefficient
Noise coefficient
15.What does FSTC stand for?
Field Sound Transmission Class
Field Standard Transmission Class
Field Sound Testing Class
None of the above
16.A range of frequencies whose upper band limit frequency is nominally twice the lower band limit frequency is called _______________.
Octave Band
Noise Frequency
17.What does HVAC stand for?
Heating, Ventilation and Air Conditioning
Heating, Variety and Air Conditioning
Heavy, Ventilation and Air Conditioning
None of the above
18.Sound Transmission Loss is a measure of sound insulation provided by a structural configuration.
True
False
19.A __________ is a solid structure that intercepts the direct sound path from a source to a receiver.
Barrier
Diffraction
20.What does figure 5-9 illustrate about?
(Refer Pg 5-12)
Edge Effects at End of Barrier
Approximate Noise Reduction of Typical Exterior Wall Constructions
Sound Transmission
None of the above