Practice Test Geeks(ABA) American Board of Audiology Practice Test
← All ABA Flashcard Decks

Emissions Control & Environmental Compliance Flashcards

7 cards from real ABA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Emissions Control & Environmental Compliance flashcards as text

  1. The U.S. Environmental Protection Agency identified what day-night average sound level (Ldn) as the threshold below which noise does not adversely affect public health and welfare?

    Answer: 55 dB Ldn

    The EPA's 1974 Levels Document identified 55 dB Ldn as the outdoor community noise level below which significant adverse effects on public health are not expected.

  2. A-weighting is applied when measuring occupational and environmental noise because it:

    Answer: Approximates the human ear's frequency-dependent sensitivity

    A-weighting attenuates low and very high frequencies to match the human auditory system's sensitivity, making dBA readings correlate with perceived loudness and hearing risk.

  3. A personal noise dosimeter is distinguished from a fixed-location sound level meter primarily because it:

    Answer: Integrates cumulative noise dose over a worker's full shift

    A dosimeter worn by the worker integrates all noise exposures throughout the shift, calculating total dose as a percentage of the OSHA permissible exposure.

  4. Using OSHA's 5 dB exchange rate, a worker exposed to 95 dBA has a permissible exposure time of:

    Answer: 4 hours

    With the 5 dB halving rule, each 5 dB increase above 90 dBA cuts allowable time in half; 95 dBA = 4 hours, 100 dBA = 2 hours, 105 dBA = 1 hour.

  5. C-weighting on a sound level meter is preferred over A-weighting when measuring:

    Answer: Impulse noise or low-frequency-dominant sound sources

    C-weighting has a relatively flat frequency response and captures low-frequency and impulse noise content that A-weighting would underestimate.

  6. The EPA Noise Control Act of 1972 granted EPA authority to regulate noise from all of the following EXCEPT:

    Answer: Individual workers in private industry facilities

    The Noise Control Act covers transportation noise sources (aircraft, rail, motor carriers) but occupational noise exposure of individual workers is regulated by OSHA, not the EPA.

  7. The maximum permissible ambient noise level (MPANL) for audiometric test rooms used in hearing conservation programs is specified in:

    Answer: OSHA 29 CFR 1910.95 Appendix D

    OSHA 29 CFR 1910.95 Appendix D references the ambient noise limits for audiometric test rooms used in occupational hearing conservation programs.