Three ventilation fans are installed in an industrial area. the produced sound pressure levels are 86 db, 90db, and 85 db for fan 1, fan 2, and fan 3 respectively. if all three are working at the same time what would be the sound pressure level?
is the sound levels accepted according to osha standard for 8 hr exposure?
o in the range of 88db -90 db / accepted
o in the range of 88db -90 db / not accepted
o in the range of 90 db-93 db / accepted
o in the range of 90 db-93 db /not accepted

An insulated tank truck containing 50,000 pounds of double-distilled, deionized water at 30 °c is pumped into a closed, refrigerated storage tank maintained at 5 °c in a facility located on top of mount mitchell, north carolina (elevation 6,684 feet & average july temperature of 84 °f). a)-determine the volume of the storage tank required to hold the purified water. b)- determine the initial and final pressure differences that must be overcome by a liquid pump assuming the storage tank initially contains air at 5 °c. assume the air is slowly bled out of the storage tank during the water transfer c.) during a routine operation today, the tank is slightly ruptured by a stainless steel pipe and a water acrosol of droplets begins to spray out of the storage tank. state all assumptions and determine the internal pressure within the water droplets produced