CAOHC Actual Exam 2 with Questions and 100% Correct Answers| Pass Guaranteed
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Course
CAOHC
Institution
CAOHC
DOD PEL - greater than or equal to 85 dBA TWA for 8 hours
or
greater than or equal to 140 dBP impulse noise
OSHA PEL - greater than or equal to 90 dBA for 8
hr or
140 dBP impulse noise
CAOHC Actual Exam 2 with
Questions and 100% Correct
Answers| Pass Guaranteed
DOD PEL - ✔✔greater than or equal to 85 dBA TWA for 8 hours
or
greater than or equal to 140 dBP impulse noise
OSHA PEL - ✔✔greater than or equal to 90 dBA for 8
hr or
140 dBP impulse noise
damage rise criteria - ✔✔risk of acquiring a hearing loss as a result of a specified noise exposure
provides a method for determining the acceptable limits of noise exposure, or the maximum safe
or allowable noise levels for various frequencies.
dose - ✔✔percentage of PEL
exchange rate - ✔✔time/intensity tradeoff
time weighting factor used in average varying levels of noise in an exposure
noise survey - ✔✔mapping of noise levels to determin need for more detailed assesment
noise study - ✔✔established exposures and identifies problem noise sources
octave band analysis - ✔✔breakdown of sound into frequency bands
,noise reduction rating - ✔✔single number indicator that can be used to determine attenuation
of hearing protection "best fit"
time weighted average - ✔✔average sound level or exposure for a 8 hour workday and 40 hour
work week.
PEL for DOD ACGIH NIOSH - ✔✔85 dBA TWA for 8 hr
PEL for OSHA, MSHA - ✔✔90dBA TWA for 8 hr
action level - ✔✔85 TWA over 8 hr
point at which a hearing conservation program is required
dose - ✔✔percentage of PEL 100%
based on 24 hr time
93dBA+93dBA=96dBA
50%+50%=100%
• Microprocessor - ✔✔- Test is computer-controlled or automated (e.g., DoD's Defense
Occupational and Environmental Health Registry System - Hearing Conservation [DOEHRS-HC])
manual audiometer - ✔✔- Examiner is in control of test
- Not automated
- Can be used for hard-to-test patients
Audiometer Specifications - ✔✔• Must meet ANSI S3.6 standard - current edition
• Earphones are not interchangeable between audiometers
, annual acoustic calibration - OSHA - ✔✔• Or if daily biological/ bioacoustic check is off by 10 dB or
more
• Checks linearity and output
biennial exhaustive calibration - ✔✔• Or if acoustic calibration is off by 15 dB or more
• Includes linearity, output, harmonics, rise and fall time, etc
• Calibrated to ANSI S3.6 - current edition
• Performed by trained personnel with appropriate equipment
Audiometer Daily Calibration and Functional Check - ✔✔• Calibration and functional check
are required at the start of every test day, before use for testing
• Audiometer and headphones are calibrated together as a unit
• If audiometer does not pass daily calibration or functional check, the audiometer cannot be used and
must be turned in for repair with its matching headphones
- Can perform multiple hearing tests at the same time
- Reduces human error
micro processor audiometer disadvantages - ✔✔- More expensive than manual audiometers
- Difficult for some employees
when is manual audiometry appropriate - ✔✔• Use to retest questionable thresholds or
when threshold determination is unsuccessful in automatic mode
• Subject has difficulty understanding instructions • Motor skill challenges with hand switch
• Distraction, lack of focus, sleepiness
• Fear, nervousness
• Tinnitus
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