Chapter 4 & 5 CAOHC Study Guide
3 common signs of exposure to potentially hazardous loud noise - ANS-three-foot rule
experiencing tinnitus at the end of work shift
experiencing temporary threshold shift at end of work shift
3 primary reasons to conduct noise measurements - ANS-- identify employees exposed to
hazardous noise levels
- determine amount of protection required of hearing protections for different employee noise
exposures
- to determine the effectiveness of engineering controls
time weighted average - ANS-average of noise exposure based on all accumulated noise levels
across and 8-hour work shift
OSHA action level - ANS-noise levels at or above 85 dBA for 8-hour TWA
OSHA permissible exposure level and exchange rate - ANS-noise levels at or above 90 dBA; 5
dB exchange rate; for every 5 dB increase in noise the amount of allowable unprotected
exposure is halved
hearing conservations measures when action level is met - ANS-- annual hearing tests
- annual hearing conservation training education
- option to wear hearing protectors
OSHA sound level meter for noise measurement - ANS-- type 2 general purpose SLM (+/- 2 dB
accuracy
- octave band analyzer (optional)
octave band analyzer - ANS-used to measure sound levels at octave, half-octave, and
third-octave frequency bands; this information used in engineering controls and to document
ambient sound levels inside audiometric test booths
5 appropriate uses for a SLM in HCP - ANS-steady state or continuous noise, impulse noise,
area monitoring, random sampling, booth certification
SLM calibrator - ANS-used to check if SLM or dosimeter is functioning properly; emits a 1000Hz
tone at 114 dB and SLM adjusted to match intensity output; must be checked before and after
use; meters must not drift more than +/- .5 dB
noise dosimeter - ANS-records employee's individual noise exposure level over a determined
period of time. Results are provided in TWA and percent dose
3 common signs of exposure to potentially hazardous loud noise - ANS-three-foot rule
experiencing tinnitus at the end of work shift
experiencing temporary threshold shift at end of work shift
3 primary reasons to conduct noise measurements - ANS-- identify employees exposed to
hazardous noise levels
- determine amount of protection required of hearing protections for different employee noise
exposures
- to determine the effectiveness of engineering controls
time weighted average - ANS-average of noise exposure based on all accumulated noise levels
across and 8-hour work shift
OSHA action level - ANS-noise levels at or above 85 dBA for 8-hour TWA
OSHA permissible exposure level and exchange rate - ANS-noise levels at or above 90 dBA; 5
dB exchange rate; for every 5 dB increase in noise the amount of allowable unprotected
exposure is halved
hearing conservations measures when action level is met - ANS-- annual hearing tests
- annual hearing conservation training education
- option to wear hearing protectors
OSHA sound level meter for noise measurement - ANS-- type 2 general purpose SLM (+/- 2 dB
accuracy
- octave band analyzer (optional)
octave band analyzer - ANS-used to measure sound levels at octave, half-octave, and
third-octave frequency bands; this information used in engineering controls and to document
ambient sound levels inside audiometric test booths
5 appropriate uses for a SLM in HCP - ANS-steady state or continuous noise, impulse noise,
area monitoring, random sampling, booth certification
SLM calibrator - ANS-used to check if SLM or dosimeter is functioning properly; emits a 1000Hz
tone at 114 dB and SLM adjusted to match intensity output; must be checked before and after
use; meters must not drift more than +/- .5 dB
noise dosimeter - ANS-records employee's individual noise exposure level over a determined
period of time. Results are provided in TWA and percent dose
