ABC Wastewater 2 Verified Multiple Choice and Conceptual Actual Frequently Tested
Exam Questions With Reviewed 100% Correct Detailed Answers
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1. The fecal coliform group is comprised of Escherichia coli
and
A. Streptococcu C. Klebsiella
B. Enterobactor
C. Klebsiella
D. Citrobacter
2. Coliform bacteria are
A. Pathogens which cause hepatitis
B. More resistant to chlorination than pathogenic bacte- B. More resistant to chlorination than pathogenic bacteria
ria
C. Pathogens which can cause typhoid
D. Less resistant to chlorination than pathogenic bacteria
3. The typical air-to-solids ratio for a dissolved air floata-
tion unit is
A. 0.02 to 0.04 kg/kg (0.02 to 0.04 lb/lb) A. 0.02 to 0.04 kg/kg (0.02 to 0.04 lb/lb)
B. 10 to 40 kg/kg (10 to 40 lb/lb)
C. 0.2 to 0.4 kg/kg (0.2 to 0.4 lb/lb)
D. 1 to 5 kg/kg (1 to 5 lb/lb)
4. ORP stands for
A. Oxygen recirculation pump
D. Oxidation reduction potential
B. Oxygen reclamation process
C. Oxygen residual probe
D. Oxidation reduction potential
5. A confined space atmosphere contains a combustible
gas. At what percentage of the Lower Explosive Limit (LEL)
C. 15%
for that gas is the atmosphere considered "hazardous"?
, ABC Wastewater 2 Verified Multiple Choice and Conceptual Actual Frequently Tested
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A. 19.5%
B. 10%
C. 15%
D. 1%
6. When using an evaporator in disinfection, the chlo-
rine-pressure-reducing valve should be located
A. Next to the evaporator D. Downstream of the evaporator
B. Inside the evaporator
C. Upstream of the evaporator
D. Downstream of the evaporator
7. The vapor density of a hazardous gas present in a con-
fined space is 1.15. Where is this gas likely to be found?
A. At this density, the gas will dissipate immediately D. Near the floor
B. Near the ceiling
C. Equally distributed throughout the space
D. Near the floor
8. A pH drop in an aerobic digester can be caused by
A. Organic underloading C. Nitrification of CO2 buildup
B. Hydraulic overloading
C. Nitrification or CO2 buildup
D. Clogging of dittusers
9. A "dewatering" beach is a component of a(n)
B. Centrifuge
A. Anaerobic digester
B. Centrifuge
, ABC Wastewater 2 Verified Multiple Choice and Conceptual Actual Frequently Tested
Exam Questions With Reviewed 100% Correct Detailed Answers
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C. Belt filter press
D. Aeration basin
10. Potassium permanganate is used for
A. Stabilization D. Odor control
B. Disinfection
C. Coagulation
D. Odor control
11. If a good floc forms before contacting a gravity belt
thickener but the slurry exiting the belt is very wet, the
most likely cause is
C. The belt is dirty and clogged
A. The rollers are not parallel
B. The blet tension is too tight
C. The belt is dirty and clogged
D. All of the above
12. Mean cell residence time (MCRT) is mathematically
described as the mass of solids (lb or kg) in a process
A. Divided by the mass of solids leaving the process (lb/d
or kg/d) A. Divided by the mass of solids leaving the process (lb/d
B. Multiplied by the amount of solids entering the system or kg/d)
(lb/d or kg/d)
C. Divided by the concentration of solids in the system
(mg/L)
D. Multiplied by the concentration of solids in the system
(mg/L or ppm)
13. Aerobic digesters digest sludge, but can also be used
to
, ABC Wastewater 2 Verified Multiple Choice and Conceptual Actual Frequently Tested
Exam Questions With Reviewed 100% Correct Detailed Answers
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A. Disinfect the sludge
B. Ferment the sludge C. Thicken the sludge
C. Thicken the sludge
D. Filter the sludge
14. A good way to measure the biological activity
and aeration in your biological reactor is to use the
test
A. SOUR
A. SOUR
B. SS
C. TKN
D. VSS
15. If adding sodium bicarbonate to an anaerobic di-
gester for pH control, care should be taken not to over-
dose because
A. CO2 will be consumed and can result in a vacuum in the
B. Sodium toxicity can result
tank
B. Sodium toxicity can result
C. Calcium carbonate can precipitate and cause prob-
lems
D. pH may spike above 12.0
16. The optimum growth of nitrifying bacteria is typically
in a pH range of
A. 6.5 to 7.5 B. 7.5 to 8.5
B. 7.5 to 8.5
C. 5.5 to 6.5
D. 8.5 to 9.5
Exam Questions With Reviewed 100% Correct Detailed Answers
Guaranteed Pass!!Current Update!!
1. The fecal coliform group is comprised of Escherichia coli
and
A. Streptococcu C. Klebsiella
B. Enterobactor
C. Klebsiella
D. Citrobacter
2. Coliform bacteria are
A. Pathogens which cause hepatitis
B. More resistant to chlorination than pathogenic bacte- B. More resistant to chlorination than pathogenic bacteria
ria
C. Pathogens which can cause typhoid
D. Less resistant to chlorination than pathogenic bacteria
3. The typical air-to-solids ratio for a dissolved air floata-
tion unit is
A. 0.02 to 0.04 kg/kg (0.02 to 0.04 lb/lb) A. 0.02 to 0.04 kg/kg (0.02 to 0.04 lb/lb)
B. 10 to 40 kg/kg (10 to 40 lb/lb)
C. 0.2 to 0.4 kg/kg (0.2 to 0.4 lb/lb)
D. 1 to 5 kg/kg (1 to 5 lb/lb)
4. ORP stands for
A. Oxygen recirculation pump
D. Oxidation reduction potential
B. Oxygen reclamation process
C. Oxygen residual probe
D. Oxidation reduction potential
5. A confined space atmosphere contains a combustible
gas. At what percentage of the Lower Explosive Limit (LEL)
C. 15%
for that gas is the atmosphere considered "hazardous"?
, ABC Wastewater 2 Verified Multiple Choice and Conceptual Actual Frequently Tested
Exam Questions With Reviewed 100% Correct Detailed Answers
Guaranteed Pass!!Current Update!!
A. 19.5%
B. 10%
C. 15%
D. 1%
6. When using an evaporator in disinfection, the chlo-
rine-pressure-reducing valve should be located
A. Next to the evaporator D. Downstream of the evaporator
B. Inside the evaporator
C. Upstream of the evaporator
D. Downstream of the evaporator
7. The vapor density of a hazardous gas present in a con-
fined space is 1.15. Where is this gas likely to be found?
A. At this density, the gas will dissipate immediately D. Near the floor
B. Near the ceiling
C. Equally distributed throughout the space
D. Near the floor
8. A pH drop in an aerobic digester can be caused by
A. Organic underloading C. Nitrification of CO2 buildup
B. Hydraulic overloading
C. Nitrification or CO2 buildup
D. Clogging of dittusers
9. A "dewatering" beach is a component of a(n)
B. Centrifuge
A. Anaerobic digester
B. Centrifuge
, ABC Wastewater 2 Verified Multiple Choice and Conceptual Actual Frequently Tested
Exam Questions With Reviewed 100% Correct Detailed Answers
Guaranteed Pass!!Current Update!!
C. Belt filter press
D. Aeration basin
10. Potassium permanganate is used for
A. Stabilization D. Odor control
B. Disinfection
C. Coagulation
D. Odor control
11. If a good floc forms before contacting a gravity belt
thickener but the slurry exiting the belt is very wet, the
most likely cause is
C. The belt is dirty and clogged
A. The rollers are not parallel
B. The blet tension is too tight
C. The belt is dirty and clogged
D. All of the above
12. Mean cell residence time (MCRT) is mathematically
described as the mass of solids (lb or kg) in a process
A. Divided by the mass of solids leaving the process (lb/d
or kg/d) A. Divided by the mass of solids leaving the process (lb/d
B. Multiplied by the amount of solids entering the system or kg/d)
(lb/d or kg/d)
C. Divided by the concentration of solids in the system
(mg/L)
D. Multiplied by the concentration of solids in the system
(mg/L or ppm)
13. Aerobic digesters digest sludge, but can also be used
to
, ABC Wastewater 2 Verified Multiple Choice and Conceptual Actual Frequently Tested
Exam Questions With Reviewed 100% Correct Detailed Answers
Guaranteed Pass!!Current Update!!
A. Disinfect the sludge
B. Ferment the sludge C. Thicken the sludge
C. Thicken the sludge
D. Filter the sludge
14. A good way to measure the biological activity
and aeration in your biological reactor is to use the
test
A. SOUR
A. SOUR
B. SS
C. TKN
D. VSS
15. If adding sodium bicarbonate to an anaerobic di-
gester for pH control, care should be taken not to over-
dose because
A. CO2 will be consumed and can result in a vacuum in the
B. Sodium toxicity can result
tank
B. Sodium toxicity can result
C. Calcium carbonate can precipitate and cause prob-
lems
D. pH may spike above 12.0
16. The optimum growth of nitrifying bacteria is typically
in a pH range of
A. 6.5 to 7.5 B. 7.5 to 8.5
B. 7.5 to 8.5
C. 5.5 to 6.5
D. 8.5 to 9.5
