Question #1.
A worker exposure to noise in a given plant is measured as follows during various time periods in an 8-hour shift:
8:00 am - 9:00 am 86 dBA
9:00 am - 11:00 am 84 dBA
11:00 am - 12 noon 81 dBA
12 noon - 1:00 pm 101 dBA
1:00 pm - 4:00 pm 75 dBA
a. Perform computations to determine whether maximum PELs have been exceeded. SHOW YOUR CALCULATION.
b. Have ALs been exceeded? Why?
c. Given the noise exposure just described, would the employer be required to furnish hearing protectors? Why?
d. Would employees be required to use the hearing protectors? Why?
Question #2
A full-revolution press has 100 rpm flywheel rotation. The press is equipped with two-hand trip devices mounted on the machine at a distance of 20 inches from the point of operation. How many engagement points on the flywheel would be necessary to make this machine safe? Show your work.