ABA ABA Hearing Conservation & Occupational Audiology

Question 1

According to OSHA's Hearing Conservation Amendment (29 CFR 1910.95), the action level at which a hearing conservation program must be implemented is:

Accepted Answer

85 dBA TWA8

Answer

80 dBA TWA8

Answer

90 dBA TWA8

Answer

100 dBA TWA8

Question 2

OSHA's Permissible Exposure Limit (PEL) for occupational noise is based on which exchange rate?

Accepted Answer

5 dB exchange rate

Answer

3 dB exchange rate

Answer

4 dB exchange rate

Answer

6 dB exchange rate

Question 3

A standard threshold shift (STS) under OSHA's hearing conservation standard is defined as a change in hearing threshold averaging how many dB in either ear at 2000, 3000, and 4000 Hz?

Accepted Answer

15 dB

Answer

10 dB

Answer

20 dB

Answer

25 dB

Question 4

Which audiometric pattern is most characteristic of noise-induced hearing loss (NIHL)?

Accepted Answer

Notch at 4000 Hz with recovery at 8000 Hz

Answer

Flat sensorineural hearing loss

Answer

Low-frequency sensorineural hearing loss

Answer

Conductive hearing loss at all frequencies

Question 5

The Noise Reduction Rating (NRR) is used to estimate hearing protector performance. According to OSHA's method, the real-world noise attenuation is calculated by deducting 7 from the NRR and then:

Accepted Answer

Dividing the result by 2 when using A-weighted measurements

Answer

Subtracting the result directly from the C-weighted noise level

Answer

Multiplying the result by 0.75

Answer

Subtracting the result from the A-weighted level without further adjustment

Question 6

A baseline audiogram under OSHA's hearing conservation standard must be conducted within how many months of an employee's first noise exposure at or above the action level?

Accepted Answer

6 months

Answer

1 month

Answer

3 months

Answer

12 months