Summer Conservation Midterm
How many American workers in manufacturing jobs are exposed to noise levels above 85 dB? -
ANS-5 million
Which of the following pathologies is associated with acoustic trauma? - ANS-1. TM perf
2. Ossicular Discontinuity
3. Hair cell damage
Swelling and the loss of auditory neuron terminals as a byproduct of TTS is thought to be
associated with the excessive release of which neurotransmitter - ANS-Glutamate
A chain saw produces which type of potentially damaging noise? - ANS-Continuous
An example of an asphyxiate that can contribute to NIHL is - ANS-Carbon monoxide
Which of the following is the occupational hearing conservationist NOT responsible for
performing? - ANS-Audiogram interpretation
The noise level at which workers are required to wearing protection and engineering noise
controls must be considered is - ANS-90 dBA
True or false: The preferred method for determining the daily noise exposure of a worker whose
exposure is intermittent of variable is a dosimeter - ANS-True
A standard threshold shift (STS) is defined as an average change of how many dB or more at
2000, 3000, and 4000 Hz in either ear? - ANS-10 dB
True or false: According to a Cochrane Review by Brennan-Hones and colleagues (2019),
better hearing protectors are associated with a significant reduction in the risk of hearing loss -
ANS-false
True or false: The ANSI standard for allowable background noise in audiometric testing
environments is more stringent than OSHAs standard - ANS-TRUE
ACME wants to obtain a "pure" baseline audiogram on Sally, their new widget operator. Its best
that the test be conducted after how many hours since Sally's last exposure to noise? - ANS-14
hours
In addition to the baseline and annual hearing tests, OSHA requires an exit audiogram when the
employee retires, transfers, or otherwise leaves the company. - ANS-False
, True or false: When retesting 1000 Hz as apart of a hearing test and the difference at 1000 Hz
is greater than 10 dB compared to the initial threshold, the entire audiogram should be
repeated. - ANS-True
True or false: The Helleman et al (2010) study suggested that one of the potential benefits of
testing OAEs is the identification of pre-clinical hearing loss - ANS-True
The agency that conducts research, develops criteria and conducts health hazard evaluations in
all areas of occupational safety and health is known as - ANS-NIOSH
The counterpart to NIOSH for the mining industry is - ANS-Bureau of Mines
The exchange rate advocate by NIOSH is - ANS-3 dB
If the SPL of a piece of machinery is 108 dB at 2 feet from the worker, what will be the SPL of
that same piece of equipment at 4 feet? - ANS-102 dB
Which sound pressure weighting scale best represents the ear's response to noise at high
SPLs? - ANS-C
A worker at ACME manufacturing has been exposed to a time-weighted average of 85 dBA for
8 hours. According to NIOSH, he has received what percentage of his noise dosage? -
ANS-100%
ACME wants to reduce the widget machine operators noise exposure to below 85 dBA. They
are placing an acoustic barrier between the machine that produces 89 dBA, and the operator.
This is an example of - ANS-controlling noise along the path
ACME wants to avoid implementing a hearing conservation program for their workers who
operate the widget machine that produces 87 dBA by implementing split-shifts. This is an
example of: - ANS-administrative controls
If mobile test vans are used, the baseline audiogram must be conducted within how many
months following the workers initial exposure to 85 dBA or above? - ANS-12 months
Hearing protection devices must reduce the users noise exposure to a TWA of at least how any
dB if the worker has exhibited STS? - ANS-85 dBA
What is a possible explanation for tinnitus? - ANS-Tonotopic reorganization
Where there is damage to the cochlea there is no longer anything to stimulate that certain
region so there is reorganization for the area
Central gain: what would have been suppressed with a normal peripheral system is no longer
suppressed.
How many American workers in manufacturing jobs are exposed to noise levels above 85 dB? -
ANS-5 million
Which of the following pathologies is associated with acoustic trauma? - ANS-1. TM perf
2. Ossicular Discontinuity
3. Hair cell damage
Swelling and the loss of auditory neuron terminals as a byproduct of TTS is thought to be
associated with the excessive release of which neurotransmitter - ANS-Glutamate
A chain saw produces which type of potentially damaging noise? - ANS-Continuous
An example of an asphyxiate that can contribute to NIHL is - ANS-Carbon monoxide
Which of the following is the occupational hearing conservationist NOT responsible for
performing? - ANS-Audiogram interpretation
The noise level at which workers are required to wearing protection and engineering noise
controls must be considered is - ANS-90 dBA
True or false: The preferred method for determining the daily noise exposure of a worker whose
exposure is intermittent of variable is a dosimeter - ANS-True
A standard threshold shift (STS) is defined as an average change of how many dB or more at
2000, 3000, and 4000 Hz in either ear? - ANS-10 dB
True or false: According to a Cochrane Review by Brennan-Hones and colleagues (2019),
better hearing protectors are associated with a significant reduction in the risk of hearing loss -
ANS-false
True or false: The ANSI standard for allowable background noise in audiometric testing
environments is more stringent than OSHAs standard - ANS-TRUE
ACME wants to obtain a "pure" baseline audiogram on Sally, their new widget operator. Its best
that the test be conducted after how many hours since Sally's last exposure to noise? - ANS-14
hours
In addition to the baseline and annual hearing tests, OSHA requires an exit audiogram when the
employee retires, transfers, or otherwise leaves the company. - ANS-False
, True or false: When retesting 1000 Hz as apart of a hearing test and the difference at 1000 Hz
is greater than 10 dB compared to the initial threshold, the entire audiogram should be
repeated. - ANS-True
True or false: The Helleman et al (2010) study suggested that one of the potential benefits of
testing OAEs is the identification of pre-clinical hearing loss - ANS-True
The agency that conducts research, develops criteria and conducts health hazard evaluations in
all areas of occupational safety and health is known as - ANS-NIOSH
The counterpart to NIOSH for the mining industry is - ANS-Bureau of Mines
The exchange rate advocate by NIOSH is - ANS-3 dB
If the SPL of a piece of machinery is 108 dB at 2 feet from the worker, what will be the SPL of
that same piece of equipment at 4 feet? - ANS-102 dB
Which sound pressure weighting scale best represents the ear's response to noise at high
SPLs? - ANS-C
A worker at ACME manufacturing has been exposed to a time-weighted average of 85 dBA for
8 hours. According to NIOSH, he has received what percentage of his noise dosage? -
ANS-100%
ACME wants to reduce the widget machine operators noise exposure to below 85 dBA. They
are placing an acoustic barrier between the machine that produces 89 dBA, and the operator.
This is an example of - ANS-controlling noise along the path
ACME wants to avoid implementing a hearing conservation program for their workers who
operate the widget machine that produces 87 dBA by implementing split-shifts. This is an
example of: - ANS-administrative controls
If mobile test vans are used, the baseline audiogram must be conducted within how many
months following the workers initial exposure to 85 dBA or above? - ANS-12 months
Hearing protection devices must reduce the users noise exposure to a TWA of at least how any
dB if the worker has exhibited STS? - ANS-85 dBA
What is a possible explanation for tinnitus? - ANS-Tonotopic reorganization
Where there is damage to the cochlea there is no longer anything to stimulate that certain
region so there is reorganization for the area
Central gain: what would have been suppressed with a normal peripheral system is no longer
suppressed.
