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At a manufacturing shop the noise exposure levels for an employee are as follows: 3 hours...

At a manufacturing shop the noise exposure levels for an employee are as follows:

3 hours and  45 minutes at 90 dBA

2 hour and 15 minutes at 92 dBA

45 minutes at 95 dBA

30 minutes at 97 dBA

45 minutes without any noise

What is the value of TWAN?

1.1900

0.1391

None of them is the answer

1.0021
business   Operations-Management   
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Answer #1
Hours of exposure, Ci Noise level, Li (in dBA) Reference exposure time used by OSHA,
Ti = 8 / 2(L - 90)/5		 Ci / Ti
3.75 90 8 0.47
2.25 92 6 0.37
0.75 95 4 0.19
0.50 97 3 0.16
0.75 0 2097152 0.00
TWAN = Σ(Ci / Ti) = 1.19
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