CAOHC Exam review UPDATED ACTUAL Questions and CORRECT Answers
hearing protection, record keeping, training, noise moni-
Elements to an effective hearing program?
toring and control
In addition to noise, exposure can be caused by
Ototoxicant
sensorineral hearing loss?
Intensity is measured in decibels (dB)
Frequency is measured in Hz (Hertz)
collects sound waves and enhances high frequency
Functions of the outer ear
sounds
Functions of the middle transforms sound to mechanical energy
The three bones in the ear that help with hearing are the
Incus, Malleus, and Stapes
, , and the
Human hearing range at birth 20-20000 Hz
What causes sensorineural hearing loss?
When hearing is only available in one ear and not the
Unilateral
other is called hearing loss
Type S (limited function) offers lower accuracy with limited function
What is impulse/impact noise?
What part of the ear is shaped like a snail? The cochlea
OSHA defines 100% noise dose as 90dB(A)
IF the retest does not confirm the STS, are no longer
hearing protective devices
mandatory if TWA is 85-89dB(A)
What is intermittent noise?
What is Continuous noise?
Adding a muffler to an engine is an example of
engineering
control
Sound level meters and dosimeters should be calibrated yearly
, What part of the ear does hearing loss affect? Inner ear (cochlea)
is caused by auditory nerve damage Tinnitus
What is mixed hearing loss? combo of conductive and sensorineural
What part of the ear is affected by noise-induced hearing
outer or middle ear
loss?
The Noise Reduction Rating is calculated using the
B
weighted scale?
and are the two structures of the inner ear hearing and balance
An STS must be reported to the employee within days
21
of wrtiting?
are the smallest bone in the body ossicles
Excessive noise exposure is generally causes hear-
sensorineural
ing loss
Increase to 50dB, and 10 thereafter if there's still no rep-
What do you do if there's no response at 30db(HL)
sonse
Frequencies used to calculate and STS 2000, 3000, and 4000 Hz
Type II (general purpose) SLMs offer good and acceptable accuracy
When has an STS occured? When an average 10dB or more has
Too much noise in the testing environment will most likely
500 (lowest)
affect the Hz threshold
An STS results in Temporary hearing loss
Action Level in the US measured at 8-hour TWA? 85dBA
OSHA Permissable Exposure Limit for occupational noise? 90dB(A) TWL
use quieter machines, isolating the noise source, limiting
What can employers do to control worker exposure to
worker exposure, or using effective hearing protection
excessive noise and hearing loss?
equipment
2/5
hearing protection, record keeping, training, noise moni-
Elements to an effective hearing program?
toring and control
In addition to noise, exposure can be caused by
Ototoxicant
sensorineral hearing loss?
Intensity is measured in decibels (dB)
Frequency is measured in Hz (Hertz)
collects sound waves and enhances high frequency
Functions of the outer ear
sounds
Functions of the middle transforms sound to mechanical energy
The three bones in the ear that help with hearing are the
Incus, Malleus, and Stapes
, , and the
Human hearing range at birth 20-20000 Hz
What causes sensorineural hearing loss?
When hearing is only available in one ear and not the
Unilateral
other is called hearing loss
Type S (limited function) offers lower accuracy with limited function
What is impulse/impact noise?
What part of the ear is shaped like a snail? The cochlea
OSHA defines 100% noise dose as 90dB(A)
IF the retest does not confirm the STS, are no longer
hearing protective devices
mandatory if TWA is 85-89dB(A)
What is intermittent noise?
What is Continuous noise?
Adding a muffler to an engine is an example of
engineering
control
Sound level meters and dosimeters should be calibrated yearly
, What part of the ear does hearing loss affect? Inner ear (cochlea)
is caused by auditory nerve damage Tinnitus
What is mixed hearing loss? combo of conductive and sensorineural
What part of the ear is affected by noise-induced hearing
outer or middle ear
loss?
The Noise Reduction Rating is calculated using the
B
weighted scale?
and are the two structures of the inner ear hearing and balance
An STS must be reported to the employee within days
21
of wrtiting?
are the smallest bone in the body ossicles
Excessive noise exposure is generally causes hear-
sensorineural
ing loss
Increase to 50dB, and 10 thereafter if there's still no rep-
What do you do if there's no response at 30db(HL)
sonse
Frequencies used to calculate and STS 2000, 3000, and 4000 Hz
Type II (general purpose) SLMs offer good and acceptable accuracy
When has an STS occured? When an average 10dB or more has
Too much noise in the testing environment will most likely
500 (lowest)
affect the Hz threshold
An STS results in Temporary hearing loss
Action Level in the US measured at 8-hour TWA? 85dBA
OSHA Permissable Exposure Limit for occupational noise? 90dB(A) TWL
use quieter machines, isolating the noise source, limiting
What can employers do to control worker exposure to
worker exposure, or using effective hearing protection
excessive noise and hearing loss?
equipment
2/5
