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SLHS 570 CAOHC Test (1).
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SLHS 570 CAOHC Test (1).
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SLHS 570 CAOHC Testhow many people in the U.S. have noise-related hearing loss? - ANS-10 million
how many workers are exposed to potentially damaging noise each year? - ANS-22
million
four "P"s of NIHL - ANS-painless
permanent
progressive
preventable
noise is defined as... - ANS-any auditory stimulus intense enough to cause hearing loss
in the human hearing mechanism frequencies
what is TTS? - ANS-temporary threshold shift or a temporary decrease in hearing
sensitivity
name the 3 federal hearing conservation regulation standards - ANS-Occupational
safety and health act -OSHA (29 CFR 1910.95)
Federal Coal Mine and Safety Act-MSHA (30 CFR Part 62)
Occupational Noise Exposure for Railroad Operating Employees-FRA (49 CFR 227 &
229)
what are the 7 components of hearing conservation program? - ANS-noise
measurement
engineering and administrative controls
monitoring audiometry
hearing protection
employee training
,recordkeeping
program evaluation (a NIOSH recommendations)
what is a noise notch? - ANS-a noticeable dip primarily at 4000 Hz with subsequent
improvement in hearing in the high frequencies
define the physical characteristics of sound - ANS-a wave generated by pressure
changes of the particles in elastic mediums such as air, fluids, or solids
define air conduction sound waves compression phase - ANS-outward movement of
tuning fork causing area of high pressure of air molecules
define air conduction sound wave rarefraction phase - ANS-opposite movement of
tuning fork causing an area of low pressure of the air molecules
define sound wave cycle - ANS-completion of one compression phase and one
rarefraction phase
define frequency (pitch) - ANS-number of cycles per second of the sound wave known
as Hertz (Hz)
define intensity (loudness) - ANS-amplitude of amount of pressure of the sound wave
measured in decibels (dB) with is a logarithmic scale
standardized pressure reference of 0 dB HL - ANS-0.0002muBar (Microbar) or 20 muPA
(microPascals)
name the 3 temporal characteristics of sound - ANS-steady-state = continuous sound
intermittent = variable intensity
impulse or impact = <1/2 second in duration
define TWA - ANS-Time Weighted Average
which dB weighting network most closely stimulates the human ear by providing greater
low frequency suppression below 1000 Hz? - ANS-dBA
, 3 parts of the ear - ANS-outer ear
middle ear
inner ear
outer ear - ANS-pinna and external ear canal
middle ear - ANS-tympanic membrane and ossicles (malleus, incus, and stapes)
eustachian tube
inner ear - ANS-cochlea, vestibule, semi-circular canals, and auditory nerve
define criteria for normal hearing in adults - ANS-hearing thresholds between 0 dB HL
and 25 dB H between 250 - 8000 hz
9 possible causes of a CHL - ANS-cerumen
collapsed ear canal
external otitis
foreign body in the ear canal
perforated tympanic membrane
ossicula chain discontinuity
otitis media (acute/chronic)
eustachian tube dysfunction
otosclerosis
cerumen - ANS-mild to moderate flat HL that may affect all frequencies, most notable at
500 and 1000 Hz
collapsed ear canal - ANS-inconsistent results, usually HL at 500 and 1000 Hz
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