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Goshorn Industrial Final (1)
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Goshorn Industrial Final (1)
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Goshorn Industrial FinalWhat does CAOHC stand for? - ANS-Council for Accreditation of Occupational Hearing
Conservation
True or False: The OHC can be responsible for the diagnosis of hearing problems. - ANS-False
Name at least 6 activities the OHC is trained to carry out. - ANS-Take noise measurements
perform hearing screenings
refer to audiologists/physicians
Collect medical history
Perform a visual ear inspection
Maintain the Audiometer
True or False: Noise induced hearing loss can be reversed by medical treatment. - ANS-False
TTS stands for _______ and the OHC needs to catch these hearing losses before they become
_______. - ANS-Temporary Threshold Shift
Permanent Threshold Shifts
Name at least 3 agents besides noise that are toxic to the ear, especially when combined with
noise exposure. - ANS-Heavy metals (lead, trimethyltin)
Organic solvents (toulene, xylene)
Asphyxiants (CO)
What are 3 of the most useful abilities of human hearing? - ANS-Communication, perception of
warnings, diagnosing the sound of a machine malfunction
Inside the middle ear are situated three small bones called the ossicles, whose names are
_______, _______, and _______. The function of the ossicular chain is to _______. -
ANS-Malleus, Incus, Stapes
Conduct sound vibrations from the tympanic membrane to the middle ear.
In the inner ear, the snail-shaped end organ for hearing is the _______. - ANS-Cochlea
Noise exposed people tend to lose hearing first for the _________ tones. - ANS-High frequency
Under what conditions will the OHC need to diagnose hearing disorders? - ANS-If they are a
properly trained and certified audiologist or physician.
Give 3 examples of outer or middle ear conditions that could cause a conductive hearing loss. -
ANS-Otitis externa, otitis media, impacted cerumen
, Under what conditions should a worker refrain from wearing earplugs? - ANS-If they show
symptoms of external otitis
Name at least 5 possible causes of sensorineural hearing loss other than noise. -
ANS-Presbycusis, ototoxic drugs, genetics, prenatal infection, acoustic neuroma
Why is it important for the OHC to identify a one-sided hearing loss and refer the individual to an
ear specialist if he or she has not already received an examination for this condition? -
ANS-These results could be indicative of an acoustic neuroma
True or False: A hearing aid can restore hearing to normal. - ANS-False
If the air molecules themselves do not move very far, what is it that does travel, sometimes long
distances? - ANS-The energy created by the sound pressure wave.
Why was 20 uPa chosen as the zero reference level for the sound level meter? - ANS-20 uPa is
the smallest amount of sound pressure that can be detected by a normal ear.
What are the three most important properties of noise when hearing loss is considered? -
ANS-Frequency, intensity, and time
Most occupational noise exposures fluctuate in level during the work shift. The logarithmic
average sound exposure level normalized to an 8-hour day is called the _______ exposure
level, abbreviated _______. - ANS-8-hour time-weighted average
TWA
The relationship between level and duration of an allowance noise exposure is called the
_________. - ANS-exchange rate
What are the three main purposes of noise measurement in the occupational setting? -
ANS-Identify overexposed workers;
asses noise problems;
measure background levels in the audiometer rooms
The integrating SLM and noise dosimeter average sound levels _______. - ANS-Logarithmically
For most purposes OSHA requires the _______ (fast or slow) meter response. - ANS-Slow
True or False: When measuring the peak sound pressure level of an industrial impulse, one
should use the sound level meter's "impulse" setting. - ANS-False
What is the purpose of the octave band filter set? - ANS-To measure sound levels at particular
frequencies
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