Wastewater Class 2 Ohio ABC Part 2
2025/2026 Exam Questions with 100%
Correct Answers | Latest Update
The fecal coliform group is comprised of Escherichia coli and
____________.
A) streptococcu
B) Enterobactor
C) Klebsiella
D) Citrobacter - 🧠 ANSWER ✔✔C
Coliform bacteria are ____________.
A) pathogens which cause hepatitis
,B) more resistant to chlorination than pathogenic bacteria
C) pathogens which cause typhoid
D) less resistant to chlorination than pathogenic bacteria - 🧠 ANSWER
✔✔B
The typical air-to-solids ratio for a dissolved air floatation unit is
__________.
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) - 🧠 ANSWER ✔✔A
ORP stands for __________.
a. Oxygen Recirculation Pump
b. Oxygen Reclamation Process
c. Oxygen Residual Probe
d. Oxidation-Reduction Potential - 🧠 ANSWER ✔✔D
,A confined space atmosphere contains a combustible gas. At what
percentage of the Lower Explosive Limit (LEL) for that gas is the
atmosphere considered "hazardous"?
19.5%
10%
15%
1% - 🧠 ANSWER ✔✔C
When using an evaporator in disinfection, the chlorine-pressure-reducing
valve should be located _________________.
next to the evaporator
inside the evaporator
upstream of the evaporator
downstream of the evaporator - 🧠 ANSWER ✔✔D
The vapor density of a hazardous gas present in a confined space is 1.15.
Where is this gas likely to be found?
at this density, the gas will dissipate immediately
near the ceiling
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, equally distributed throughout the space
near the floor - 🧠 ANSWER ✔✔D
A pH drop in an aerobic digester can be caused by ______________.
organic underloading
hydraulic overloading
nitrification or CO2 buildup
clogging of diffusers - 🧠 ANSWER ✔✔C
A "dewatering beach is a component of a(n) ________.
anaerobic digester
centrifuge
belt filter press
aeration basin - 🧠 ANSWER ✔✔B
Potassium permanganate is used for _______________.
stabilization
disinfection
coagulation
2025/2026 Exam Questions with 100%
Correct Answers | Latest Update
The fecal coliform group is comprised of Escherichia coli and
____________.
A) streptococcu
B) Enterobactor
C) Klebsiella
D) Citrobacter - 🧠 ANSWER ✔✔C
Coliform bacteria are ____________.
A) pathogens which cause hepatitis
,B) more resistant to chlorination than pathogenic bacteria
C) pathogens which cause typhoid
D) less resistant to chlorination than pathogenic bacteria - 🧠 ANSWER
✔✔B
The typical air-to-solids ratio for a dissolved air floatation unit is
__________.
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) - 🧠 ANSWER ✔✔A
ORP stands for __________.
a. Oxygen Recirculation Pump
b. Oxygen Reclamation Process
c. Oxygen Residual Probe
d. Oxidation-Reduction Potential - 🧠 ANSWER ✔✔D
,A confined space atmosphere contains a combustible gas. At what
percentage of the Lower Explosive Limit (LEL) for that gas is the
atmosphere considered "hazardous"?
19.5%
10%
15%
1% - 🧠 ANSWER ✔✔C
When using an evaporator in disinfection, the chlorine-pressure-reducing
valve should be located _________________.
next to the evaporator
inside the evaporator
upstream of the evaporator
downstream of the evaporator - 🧠 ANSWER ✔✔D
The vapor density of a hazardous gas present in a confined space is 1.15.
Where is this gas likely to be found?
at this density, the gas will dissipate immediately
near the ceiling
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, equally distributed throughout the space
near the floor - 🧠 ANSWER ✔✔D
A pH drop in an aerobic digester can be caused by ______________.
organic underloading
hydraulic overloading
nitrification or CO2 buildup
clogging of diffusers - 🧠 ANSWER ✔✔C
A "dewatering beach is a component of a(n) ________.
anaerobic digester
centrifuge
belt filter press
aeration basin - 🧠 ANSWER ✔✔B
Potassium permanganate is used for _______________.
stabilization
disinfection
coagulation
