Blow Machinist Operates Question & Answer Guide (With Explanation)

Understanding this question requires applying core subject principles.

What This Question Is About

This question relates to blow machinist operates and requires a structured academic response.

How to Approach This Question

Break the problem into smaller parts and analyze each logically.

Key Explanation

This topic involves blow machinist operates. A strong answer should include explanation, application, and examples.

Original Question

Joe Blow, a machinist, operates a metalworking router that produces a sound pressure level of 97.5 dBA for a total of 3 hours per 8-hour work shift. The rest of the time Joe is exposed to general shop noise which is measured at 83 dBA, except for 1 hour spent in the office where the noise level is 67 dBA. a) [4 pts] Calculate Joe Blow’s unprotected noise exposure dose (%) and the TWA (dBA) at the end of the work shift, using the OSHA hearing conservation amendment criteria for PEL, threshold, and exchange rate. b) [6 pts] You instruct Joe Blow to use NONOISE brand ear muffs when operating the router. NONOISE ear muffs have a NRR of 25 dB. Assume Joe does not wear the ear muffs when not using the router. Using NIOSH method # 3 (dBA Method), calculate the noise level (dBA) at Joe’s ear when wearing the ear muffs and his resultant noise dose in per cent for the 8-hour shift as in part a). For this calculation, derate the HPD NRR according to the OSHA directive.

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