what does LASMax mean?
what is the limit? - A-weighted slow response
115 dB
what SLM does ANSI require for area sound level maps?
how far away is the A-weighted sound level measured from the equipment in the area of concern? -
- type 2 SLM (+/- 2 dB)
- 3ft or 1 meter
CAOHC Exam Study Guide
Questions Solved 100%
what does LASMax mean?
what is the limit? - ✔✔A-weighted slow response
115 dB
what SLM does ANSI require for area sound level maps?
how far away is the A-weighted sound level measured from the equipment in the area of concern? -
✔✔- type 2 SLM (+/- 2 dB)
- 3ft or 1 meter
what is the purpose of area sound level maps? - ✔✔- post noise hazardous areas for workers
- educational tool for training where HPD is required
- identify noise sources for further investigation within a noise control study
what are the ballpark estimates used to add decibel levels? - ✔✔dB is added to the higher
intensity level based on the differences in the values being added
* 0-1 difference = + 3 dB
* 2-3 difference = + 2 dB
* 4-9 difference = + 1 dB
* 10 or more = + 0 dB
proper dosimeter placement: - ✔✔- mic should be within a 2ft radius of the head
,- cables
- work clothing
what is steady state noise?
provide an example: - ✔✔noise with a long duration
ex: engine noise
example of intermittent noise: - ✔✔hydraulic lift
example of impact noise: - ✔✔hammer hitting a nail
example of impulse noise: - ✔✔gunshot
dBA is used for: - ✔✔OSHA, MSHA, FRA, DoD
what does CAOHC stand for? - ✔✔Council for Accreditation in Occupational Hearing Conservation
what does OSHA stand for? - ✔✔Occupational Safety and Health Administration
what does MSHA stand for? - ✔✔Mine Safety and Health Administration
what does FRA stand for? - ✔✔Federal Railroad Administration
what does NIOSH stand for? - ✔✔National Institute for Occupational Safety and Health
what does DoD stand for? - ✔✔Department of Defense
what is typically the highest output level on a pure-tone air conduction audiometer? - ✔✔90 dB HL
, what serves as the basis for all other U.S. hearing conservation regulations and OHC course
instruction? - ✔✔OSHA Amendment (29 CFR 1910.95)
what are the indications for manual audiometry? - ✔✔slow/inappropriate responses, no
responses, UHL, and functional HL
how long should pure tones be presented? - ✔✔1-2 seconds
background noise affects this frequency during an exam: - ✔✔500 Hz and below
acoustic calibrations must be done: - ✔✔yearly
functional and biological checks are part of: - ✔✔daily calibration
advantage of using a microprocessor vs a manual audiometer: - ✔✔ability to simultaneously
test multiple people
how much time should one wait after noise exposure before performing a baseline? - ✔✔14 hours
what is a temporary threshold shift? - ✔✔a reversible desensitization in hearing that disappears after
removal from hazardous noise
CAOHC certification period: - ✔✔5 years
which frequency tends to have a notch in cases of NIHL? - ✔✔4000 Hz
what two aspects of sound can cause damage to one's hearing? - ✔✔intensity and duration
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