# Envoirnmental Engineering Exam 1

What are the general units (mass, length, time, etc.) of "k" for a first order reaction?
a. mass
b. mass / concentration
c. concentration
d. volume / time
c. time^-1
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The two fundamental topics which govern the movement of pollutants within an environmental system are:
a. the law of conservation of pollutants and environmental regulations
b. the law of conversation of mass and the law of conservation of energy
c. environmental regulations and economics
d. the law of conservation of mass and the periodic table of elements
e. the law of conservation of energy and gravity
Which of the following should not be modeled using a continuously stirred tank reactor (CSTR)?
a. A lake fed by a polluted stream with a sewage outfall
b. the air within a well-ventilated classroom
c. a pollutant being carried in the jet stream in the Earth's upper atmosphere
d. the water in a shallow pond with an inlet and outlet
e. a nightclub with smoking allowed indoors
Which of the following should not be modeled using a plug flow reactor (PFR)?
a. a conveyer belt carrying a single-file line of bottles with no mixing of the contents of one bottle with another
b. salmon migrating downstream to the sea
c. a nightclub with smoking allowed indoors
d. a pollutant being carried in a river
e. a pollutant being carried in the jet stream in the Earth's upper atmosphere
the residence time of the fluid within a control volume is given by
a. the PFR control volume (V) divided by the fluid flow rate (Q)
b. the fluid flow rate (Q) divided by the fluid velocity (v)
c. the PFR control volume (V) divided by the fluid velocity (v)
d. the fluid velocity (v) divided by the length of the PFR (l)
e. the fluid flow rate (Q) divided by the PFR control volume (V)