Noise Exposure and Hearing Conservation Programs Flashcards

Using OSHA's method for estimating A-weighted attenuation, what is the estimated protected exposure for a worker at 100 dBA wearing earplugs with an NRR of 29?

Answer: 89 dBA

OSHA's method subtracts 7 dB from the NRR and halves it: (29-7)/2 = 11, so 100-11 = 89 dBA.

When earplugs and earmuffs are worn together, OSHA guidance estimates protection by adding how much to the higher NRR?

Answer: 5 dB

Dual protection is estimated by adding 5 dB to the attenuation of the higher-rated device.

To what level must hearing protectors attenuate exposure for an employee who has experienced an STS?

Answer: 85 dBA TWA

For employees with an STS, protectors must reduce exposure to 85 dBA TWA or below.

Which factor most commonly reduces real-world hearing protector performance below the labeled NRR?

Answer: Improper fit and inconsistent wearing

Poor insertion, bad seals, and removal during exposure sharply reduce actual attenuation.

A worker wearing safety glasses with thick temples and earmuffs is likely to experience what?

Answer: Reduced attenuation from a broken seal

Eyewear temples break the earmuff cushion seal, allowing noise leakage.

How often must employees in a hearing conservation program receive training?

Answer: Annually

OSHA requires training to be repeated annually for each employee in the program.

Which item is NOT a required training topic in an OSHA hearing conservation program?

Answer: Calculating octave-band sound power levels

Required topics include noise effects, HPD selection and care, and audiometric testing purpose, not acoustic engineering calculations.