ENVIRONMENTAL ENGINEERING
EXAM QUESTIONS AND ANSWERS
Biochemical oxygen demand (BOD) - Correct Answers -is the amount of dissolved
oxygen needed by aerobic biological organisms in a body of water to break down
organic material present in a given water sample at certain temperature over a specific
time period.
Fixed suspended solids - Correct Answers -(FSS) is the matter remaining from the
suspended solids analysis which will not burn at 550°C. It represents the non-filterable
inorganic residue in a sample.
ideal gas law - Correct Answers -PV=nRT
molarity - Correct Answers -Whereas mole fraction is a ratio of moles to moles, molar
concentration is a ratio of moles to volume.
molar - Correct Answers -mol/m^3
mole fraction - Correct Answers -...
partial pressure - Correct Answers -In a mixture of ideal gases, each gas has a partial
pressure which is the pressure which the gas would have if it alone occupied the
volume.[1] The total pressure of a gas mixture is the sum of the partial pressures of
each individual gas in the mixture.
units atm
ppb by mass - Correct Answers -10^9
mole fraction
ppb by volume - Correct Answers -10^9
can be a volume fraction or a mole fraction
ppm by mass - Correct Answers -10^6
mole fraction
ppm volume - Correct Answers -10^9
can be a volume fraction or a mole fraction
ppt (parts per trillion) - Correct Answers -10^12
, Total dissolved solids (TDS) - Correct Answers -is the amount of dissolved matter in the
water.
TDS=VDS+FDS
total solids (TS) - Correct Answers -is the amount of organic and inorganic matter which
is contained in a water.
TS=TDS+TSS
Total Suspended solids - Correct Answers -(TSS) is the amount of suspended
(filterable) matter in a water.
TSS=VSS+FSS
total suspended particulates - Correct Answers -Tiny airborne particles or aerosols that
are less than 100 micrometers are collectively referred to as total suspended particulate
matter (TSP). These particles constantly enter the atmosphere from many sources.
Human sources include:
Motor vehicle use.
Combustion products from space heating.
Industrial processes.
Power generation.
Natural sources include:
Soil.
Bacteria and viruses.
Fungi, molds and yeast.
Pollen.
Salt particles from evaporating sea water.
volatile suspended solids - Correct Answers -after filtration- the total suspended solids
are heated 500-550C. the weight loss due to high temp provides the volatile suspended
solids.
universal gas constant - Correct Answers -is a physical constant which is featured in
many fundamental equations in the physical sciences, such as the ideal gas law and the
Nernst equation.
R=8.3144621 J/mol k
adsorption - Correct Answers -A surface phenomena in which a solute (soluble material)
concentrates or collects at a surface (the adsorbent).
acid - Correct Answers -a molecule or other entity that can donate a proton or accept an
electron pair in reactions.
EXAM QUESTIONS AND ANSWERS
Biochemical oxygen demand (BOD) - Correct Answers -is the amount of dissolved
oxygen needed by aerobic biological organisms in a body of water to break down
organic material present in a given water sample at certain temperature over a specific
time period.
Fixed suspended solids - Correct Answers -(FSS) is the matter remaining from the
suspended solids analysis which will not burn at 550°C. It represents the non-filterable
inorganic residue in a sample.
ideal gas law - Correct Answers -PV=nRT
molarity - Correct Answers -Whereas mole fraction is a ratio of moles to moles, molar
concentration is a ratio of moles to volume.
molar - Correct Answers -mol/m^3
mole fraction - Correct Answers -...
partial pressure - Correct Answers -In a mixture of ideal gases, each gas has a partial
pressure which is the pressure which the gas would have if it alone occupied the
volume.[1] The total pressure of a gas mixture is the sum of the partial pressures of
each individual gas in the mixture.
units atm
ppb by mass - Correct Answers -10^9
mole fraction
ppb by volume - Correct Answers -10^9
can be a volume fraction or a mole fraction
ppm by mass - Correct Answers -10^6
mole fraction
ppm volume - Correct Answers -10^9
can be a volume fraction or a mole fraction
ppt (parts per trillion) - Correct Answers -10^12
, Total dissolved solids (TDS) - Correct Answers -is the amount of dissolved matter in the
water.
TDS=VDS+FDS
total solids (TS) - Correct Answers -is the amount of organic and inorganic matter which
is contained in a water.
TS=TDS+TSS
Total Suspended solids - Correct Answers -(TSS) is the amount of suspended
(filterable) matter in a water.
TSS=VSS+FSS
total suspended particulates - Correct Answers -Tiny airborne particles or aerosols that
are less than 100 micrometers are collectively referred to as total suspended particulate
matter (TSP). These particles constantly enter the atmosphere from many sources.
Human sources include:
Motor vehicle use.
Combustion products from space heating.
Industrial processes.
Power generation.
Natural sources include:
Soil.
Bacteria and viruses.
Fungi, molds and yeast.
Pollen.
Salt particles from evaporating sea water.
volatile suspended solids - Correct Answers -after filtration- the total suspended solids
are heated 500-550C. the weight loss due to high temp provides the volatile suspended
solids.
universal gas constant - Correct Answers -is a physical constant which is featured in
many fundamental equations in the physical sciences, such as the ideal gas law and the
Nernst equation.
R=8.3144621 J/mol k
adsorption - Correct Answers -A surface phenomena in which a solute (soluble material)
concentrates or collects at a surface (the adsorbent).
acid - Correct Answers -a molecule or other entity that can donate a proton or accept an
electron pair in reactions.
