Millwright Level 1 Practice Exam

What is the maximum sound intensity (in dB) a worker can be exposed to during an 8-hour shift before needing to wear hearing protection?

1. 75 dB

2. 80 dB

3. 85 dB

4. 90 dB

The correct answer is: 85 dB

The correct answer pertains to the guidelines established by occupational health and safety regulations regarding noise exposure in the workplace. For an 8-hour work shift, the permissible sound intensity without mandatory hearing protection is generally set at 85 dB. This threshold is based on the understanding that exposure to noise at or above this level can contribute to hearing loss over time. When noise levels reach 85 dB, OSHA (Occupational Safety and Health Administration) recommends that hearing conservation measures, including the use of hearing protection, be implemented to protect workers' auditory health. Continuing exposure beyond this level increases the risk of irreversible hearing damage, which is why regulations are in place to ensure safety in noisy environments. The other levels of sound intensity mentioned (75 dB, 80 dB, and 90 dB) fall outside the 85 dB threshold for mandatory hearing protection under the guidelines. In particular, while levels at 90 dB are still concerning, they represent a further increase in noise where protection should be consistently used, as they pose an even greater risk than 85 dB. Understanding these guidelines is crucial for maintaining a safe work environment and preventing long-term hearing issues among workers.