CAOHC Exam Study Questions With 100%Verified Answers(Guaranteed Success)A+GRADED
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Course
CAOHC
Institution
CAOHC
CAOHC Exam Study Questions With 100%Verified Answers(Guaranteed Success)A+GRADED
Unit of measurement for frequency (pitch) - correct answer...Hertz (Hz)
Unit of measurement for intensity (loudness) - correct answer...Decibel (dB)
Risk of damage from noise - correct answer...How loud (inten...
CAOHC Exam Study Questions With
100%Verified Answers(Guaranteed
Success)A+GRADED
Unit of measurement for frequency (pitch) - correct answer...✔✔Hertz (Hz)
Unit of measurement for intensity (loudness) - correct answer...✔✔Decibel (dB)
Risk of damage from noise - correct answer...✔✔How loud (intensity) and how long
(duration)
Steady-state or continuous noise, e.g. generator - correct answer...✔✔Lasts 1 second
or longer
Impulse or Impact noise, e.g. gunfire or nail gun - correct answer...✔✔Lasts less than
one second
Parts of the outer ear - correct answer...✔✔Pinna and external auditory canal
Parts of the middle ear - correct answer...✔✔Tympanic membrane, ossicles,
eustachian tube
Eustachian tube (auditory tube) - correct answer...✔✔Tube connecting the middle ear
to the pharynx and equalizes middle ear space with atmospheric pressure
Conductive HL occurs here - correct answer...✔✔Outer or middle ear
Sensorineural hearing loss - correct answer...✔✔Hearing loss resulting from damage
to the inner ear (cochlea) or the auditory nerve
Noise-induced hearing loss (NIHL) - correct answer...✔✔Condition caused by the
destruction of hair cells, the organs responsible for hearing, as a result of sounds that
are "too long, too loud, or too close"; a sensorineural hearing loss
Mixed hearing loss - correct answer...✔✔Combination of conductive and sensorineural
types in the same ear
Possible early symptoms/signs of noise induced hearing loss - correct answer...✔✔
Tinnitus; difficulty understanding in presence of background noise; read visual cues
AGRADESOLUTIONS
, Auditory effects of noise - correct answer...✔✔NIHL; tinnitus; hyperacusis
3 foot rule - correct answer...✔✔Good rule of thumb to recognize hazardous noise
exposure levels/situations: the rule is: if you have to shout at arms length (~3ft), in order
to be understood over the background noise, then you're likely exposed to hazardous
noise levels & should be wearing hearing protection to prevent NIHL
OSHA (Occupational Safety and Health Administration) versus National institute of
Occupational Safety and Heath (NIOSH) - correct answer...✔✔OSHA enforces
regulation and NIOSH recommends best practice based on science and research
Sound pressure level (SPL) versus hearing level (HL) - correct answer...✔✔SPL
describes noise measurements taken with a sound level meter or dosimeter; HL
describes Threshold levels obtained with an audiometer; 0 dB HL is not equal to 0 dB
SPL
Noise Dosimeter - correct answer...✔✔A sound measurement device used to record
the amount of sound exposure over an extended period of
time (usually a work day)
Personal vs. Area
Sound level meter - correct answer...✔✔Uses a microphone to sense pressure
variations in sound waves; the meter converts those pressures directly into decibels;
provides a noise measurement that is a snapshot in time.
Time Weighted Average (TWA) - correct answer...✔✔An evaluation of exposures that
is time-weighted over an established period. It allow the exposure levels to be averaged
generally over an eight-hour time period.
OSHA exchange rate - correct answer...✔✔5 dB; for every 5 dB you go over the PEL
of 90dBA TWA you half the allowable time of exposure
OSHA Action Level for noise - correct answer...✔✔85dBA TWA
AGRADESOLUTIONS
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