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CAOHC REVIEW QUESTIONS AND ANSWERS
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CAOHC REVIEW QUESTIONS AND ANSWERS
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CAOHC REVIEW QUESTIONS AND ANSWERSUnit of measurement for frequency (pitch) - Answers- Hertz (Hz) or Kilohertz (kHz)
Time-Weighted Average changes if an employee works longer than _____ hour shifts. -
Answers- 8 hour
Time-Weighted Average calculates ________________________ or dB____ and the
________________ of noise exposure. - Answers- Amplitude ; dB(A) ; duration
According to OSHA, the ACTION LEVEL (AL) at which workers should be included in a
hearing conservation program occurs when they are exposed to a consistent sound
level of ___________ dB_____ for an entire ____-hour shift. - Answers- 85dB(A) ; 8-
hour shift
According to OSHA, the permissible exposure limit (PEL) for 8 hours that should not be
exceeded is: - Answers- 90 dB(A)
Several government agencies, including ______, _________, FRA, and individual state
and local governments, develop and publish noise related regulations requiring
compliance by employers. - Answers- OSHA ; DoD
If more than one regulation applies to a workplace, be sure to follow the most
_______________ one. - Answers- Stringent
Regardless of the 8-hour average, impact or impulse noise exposure should never
exceed ___________ dB(P) - Answers- 140 dB(P)
If the 8-hour Time-Weighted Average is 90 dB(A) or above, the Permissible Exposure
Limit has been reached and additional requirements apply. These include:
1. The use of __________ __________ becomes mandatory.
2. Employers must consider feasible ________________ or ________________
controls to reduce noise exposure.
3. Employers must ensure hearing protection reduces sound levels reaching the ear to
below ________ db_____. - Answers- 1. hearing protection
2. engineering or administrative
3. 90 dB(A)
Noise exposures are considered likely to be harmful if shouting is required in order to
communicate to a person __________ feet away. - Answers- 3 feet
The primary role of CAOHC is to advocate for comprehensive programs that promote
_____________ ________________ in occupational hearing conservation. - Answers-
Best Practices
, Which is true about the characteristics of sound called "frequency" (pitch, like piano
notes)? It is measured in _____________. - Answers- Hertz
Explain how to determine sound levels when the sound in an area is at 85 dB(A) and
another piece of equipment is added with a sound level of 85 dB(A)... - Answers- plus 3
dB increase to larger number.
A hearing conservation program should include:
1. __________________ controls to reduce noise levels
2. The use of _______________ ___________________.
3. ________________ _________________ testing - Answers- 1. engineering
2. hearing protection
3. Annual audiometric
________ measurements are unweighted and therefore referred to as just dB. -
Answers- Z
_______ weighting is mostly used for measuring impulse sounds like that generated by
weapons. - Answers- Z
Human Hearing Frequency Range is ______ to _____________ Hz. - Answers- 20 to
20,000 Hz
_______ weighting is unweighted across the human hearing frequency range of 20-
20,000 Hz. - Answers- Z
Most occupational noise data is presented using the _________ weighted scale. -
Answers- A
In "A" weighting, less importance or "weight" is given to ________ frequencies as it is to
___________ frequencies. - Answers- low ; high
What are the three main weighting networks (letters)? - Answers- A, C, Z
Decibels measure the _________________ of sound. - Answers- Amplitude (how loud)
Per the OSHA Hearing Conservation Standard for an 8-hour TWA, the Action Level (AL)
is ______________, and the Permissible Exposure Limit is ________________. -
Answers- 85 dB(A) ; 90 dB(A)
Exposure limits can be found in the OSHA standard at:
A. 28 CFR 1910.95(b)(2), table G-16
B. 29 CFR 1911.95(b)(2), table G-16
C. 29 CFR 1910.95(b)(2), table G-16 - Answers- C. 29 CFR 1910.95(b)(2), table G-16
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