Term
| The method of determining noise exposure that combines sound level data with the duration of the exposures or activities is: |
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Definition
| the task-based exposure analysis method (T-BEAM) or area monitoring |
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Term
| Where should the microphone of the dosimeter be located? |
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Definition
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Term
| What parameters are required to determine noise exposure? |
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Definition
| threshold level, criterion and exchange rate |
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Term
| Is 100 dB for 1/4 hour a 100% dose using the OSHA method? |
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Definition
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Term
| A dose of 80% is displayed on a dosimeter after half a shift. Assuming the remaining half is similar, the projected dose for the day is: |
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Definition
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Term
| A company has a grinder that operates continuously. They will be adding 3 more. What effect will this have on the noise exposure of the employees in this area? |
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Definition
| will roughly double it (going from 1 - 2 noise sources +3 dB; from 2 - 4 is plus 6 dB) |
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Term
| After sampling for 30 seconds, the Leq is 88.2 dB. After a minute it is 90.0. What do you do next? |
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Definition
| Keep sampling, then compare the 2 min vs. 1 min readings |
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Term
| Nighttime community noise limits are typically what dB more stringent than daytime levels? |
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Definition
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Term
| Environmental noise measurements are typically made: |
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Definition
| on the property line near the noise source |
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Term
| The numerical part of the NCB rating for room noise is the average of: |
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Definition
| 500, 1000, 2000 and 4000 Hz |
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Term
| Architects don't seem to know what all the fuss is about classroom acoustics. After all, they don't have a problem hearing and understanding. What is the most likely reason? |
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Definition
| They are adults and probably have a good command of the language |
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Term
| What are risk factors for teachers due to excessive classroom noise and reverb? |
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Definition
| vocal disorders, headaches, tension, sick days, irritability |
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Term
| At what RT does speech intelligibility fall at or below 90% - even in a perfectly quiet background? |
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Definition
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Term
In terms of their effect on speech understanding in the classroom, noise and reverb are independent and mutually exclusive parameters
T/F |
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Definition
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Term
| The classrooms, auto traffic is an example of: |
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Definition
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Term
| What noise is an example of self-generated noise? |
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Definition
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Term
| The best (most comprehensive) type of room noise assessment is the: |
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Definition
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Term
| Reverberation time is the time it takes in seconds for the sound to decay how many dB? |
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Definition
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Term
| What equation = reverb time? |
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Definition
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Term
| According to ASA and ASHA, what SNR is recommended for adequate speech understanding in the classroom? |
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Definition
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Term
| In the classroom, what contributes most to good speech intelligibility |
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Definition
| direct sound, early reflected sound |
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Term
| What is the vocal effort (measured 3 feet from the mouth) of a female teacher speaking in a raised vocal effort? |
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Definition
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Term
| The loudness level of the teacher's voice at a student's ear depends on: |
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Definition
| vocal effort, distance, early reflections |
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Term
| Name the room acoustics criteria for acceptable classroom acoustics as established in the new ANSI standard |
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Definition
| Sound level not more than 35 dBA, reverberation time of not greater than 0.7 sec |
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Term
| In resolving classroom background noise problems, it is useful to break the problem up into the elements of: |
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Definition
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Term
| To be effective at reducing the transmission of noise from one classroom to another you should: |
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Definition
| ensure the common wall extends all the way up to the structural ceiling |
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Term
| Of concrete, glass, tapestry, chalk board and brick wall, which is likely to absorb sound? |
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Definition
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Term
| The side wall of a classroom is 50 feet by 10 feet; 60% brick and 40 % windows. The absorption coefficients are 0.10 and 0.20 for brick and window glazing respectively. What is the sound absorption of the wall? |
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Definition
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Term
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Definition
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Term
| Loudspeakers for a sound field system need to be placed: |
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Definition
| within the direct field of the room |
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