Funding for the U.S. Fish and Wildlife Service comes from property taxes in each state
a. True
b. False
Indicate whether the statement is true or false
a
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A traffic accident causes traffic to come to a halt in an underwater tunnel. The people in their vehicles allow their engines to idle. There are 100 vehicles stopped in the tunnel; assume their vehicle engines emit on average 0.269 g/min of VOC (aldehyde), 3.82 g/min CO, and 0.079 g/min NOx. The tunnel is long and narrow with a height of 10 m, a width of 25 m, and a length of 0.5 km. Assume the ambient air concentrations of CO, VOCs, and NOx are small. The mean air velocity through the tunnel, when traffic stops, is limited to 0.2 m/s.
a. Assuming traffic remains halted long enough for the concentration carbon monoxide, nitric oxides, and hydrocarbons in the canyon to reach steady state, what would the expected concentrations of carbon monoxide, nitric oxides and hydrocarbons be in ppmv in the tunnel? b. Do the CO and NOx concentrations exceed NAAQS? c. Does the CO concentration exceed the OSHA’s permissible exposure limit (PEL)? What will be an ideal response?
To prevent a one-shot bending shoe from digging in when bending rigid aluminum, you should _____.
a. use a size larger diameter shoe than the conduit b. coat the shoe with WD-40® or petroleum jelly c. operate the hydraulic pump rapidly d. wrap the conduit with rags
Express 0.25 as a binary number.
What will be an ideal response?
Combustion with a perfect stoichiometric mix of oil and air produces a vent gas CO2 percentage of:
A) 10.5 percent. B) 12.5 percent. C) 15.5 percent. D) 9.5 percent.