CAOHC Questions and Answers 100%
Solved
What does CAOHC do? Create comprehensive programs that promote best practices in
occupational hearing conservation
Primary activities include providing standardized training and credentialing to facilitate OHCs to
practice hearing loss prevention
CAOHC mission statement Advance best practice in occupational hearing conservation
worldwide
Types of training under CAOHC OHC
Professional supervisor
Course director
Educational resources for CAOHC CAOHC manual
Noise course (online)
Anatomy and physiology video
,Hearing conservation team OHCs
Audiologists
Occupational health nurse
Otolaryngologist or other physician
Safety professional
Acoustical engineer
Industrial hygienist
Employer representatives
Others as needed**
What is sound? Sound is present when pressure variations from a vibrating source are
transmitted in an elastic medium. Molecules are compressed and then decompressed which
results in a sound wave that continues to travel in all directions from source
Intensity or amplitude refers to Loudness (dB)
Weighting schemes for measuring sound dB SPL (sound pressure level): used to measure
sound pressure level
dB A: used to measure worker noise exposure in a HCP (hearing conservation program)
, dB C: used to measure hearing protector equipment efficiency (attenuation)
dB HL (hearing level): used to measure hearing range for an individual
Hearing level scale values and types of hearing loss 0-25 dB normal range
26-40 dB mild loss
41-55 dB moderate loss
56-70 dB moderately severe loss
71-90 dB severe loss
90+ dB profound loss
Hearing Threshold Level (HTL) The results obtained through an audiogram using the dB HL
scale
Frequency refers to Pitch (Hz)
One full phase is a compression and a rarefaction
In a 1k Hz tone; molecules compress and decompress 1k times in one second
Hz = cycles/second
Solved
What does CAOHC do? Create comprehensive programs that promote best practices in
occupational hearing conservation
Primary activities include providing standardized training and credentialing to facilitate OHCs to
practice hearing loss prevention
CAOHC mission statement Advance best practice in occupational hearing conservation
worldwide
Types of training under CAOHC OHC
Professional supervisor
Course director
Educational resources for CAOHC CAOHC manual
Noise course (online)
Anatomy and physiology video
,Hearing conservation team OHCs
Audiologists
Occupational health nurse
Otolaryngologist or other physician
Safety professional
Acoustical engineer
Industrial hygienist
Employer representatives
Others as needed**
What is sound? Sound is present when pressure variations from a vibrating source are
transmitted in an elastic medium. Molecules are compressed and then decompressed which
results in a sound wave that continues to travel in all directions from source
Intensity or amplitude refers to Loudness (dB)
Weighting schemes for measuring sound dB SPL (sound pressure level): used to measure
sound pressure level
dB A: used to measure worker noise exposure in a HCP (hearing conservation program)
, dB C: used to measure hearing protector equipment efficiency (attenuation)
dB HL (hearing level): used to measure hearing range for an individual
Hearing level scale values and types of hearing loss 0-25 dB normal range
26-40 dB mild loss
41-55 dB moderate loss
56-70 dB moderately severe loss
71-90 dB severe loss
90+ dB profound loss
Hearing Threshold Level (HTL) The results obtained through an audiogram using the dB HL
scale
Frequency refers to Pitch (Hz)
One full phase is a compression and a rarefaction
In a 1k Hz tone; molecules compress and decompress 1k times in one second
Hz = cycles/second
