1|Page
CWEA Urban Sewer System Management Exam
Practice Questions And Correct Answers||Verified
Exam!!!|| (Verified Answers) Plus Rationale 2026/2027
Q&A| Instant Download Pdf
A digester relieve valve is normally set to go off at:
A.) 5-7 PSI
B.)5-7 inches of air
C.) 5-7 inches of nitrogen
D.)5-7 inches of water - Answer-D.)5-7 inches of water
During photosynthesis:
A.)Carbon dioxide will increase
B.)DO will decrease
C.)Carbon dioxide will decrease
D.)Temperature will decrease - Answer-C.)Carbon dioxide
will decrease
If a digester sludge volatile solids increases:
A.) Gas production will drop
B.) The pH will immediately increase
,2|Page
C.) The digester could not go sour
D.) Gas production may increase - Answer-D.) Gas
production may increase
Total chlorine residual equals:
A.) Combined / free
B.) Free - combined
C.) Combined + free
D.) Free / combined - Answer-C.) Combined + free
Chlorine residual equals:
A.) Dose - demand
B.) Dose / demand
C.) (Dose) (demand)
D.) Demand - dose - Answer-A.) Dose - demand
The best velocity for a grit chamber is:
A.) 2fpm
B.) 1fpm
C.) 1 ft/second
, 3|Page
D.) 2 ft/second - Answer-C.) 1 ft/second
Clarifier weir overflow rate is expressed as:
A.) Cubic feet per day per square foot
B.) GPD/square ft
C.) GPD/ft
D.) GPD/cubic ft - Answer-C.) GPD/ft
Sludge gasification occurs in:
A.) Activated sludge basin
B.) Primary and secondary clarifiers
C.) Grit chamber
D.) Digester - Answer-B.) Primary and secondary clarifiers
If a plant chlorinates at the headworks:
A.) Chlorine residual will increase
B.)Chlorine demand at the disinfection basin will be
reduced
C.)Chlorine residual will decrease
D.)There will be no affect on the chlorine amount used -
Answer-B.)Chlorine demand at the disinfection basin will
be reduced
CWEA Urban Sewer System Management Exam
Practice Questions And Correct Answers||Verified
Exam!!!|| (Verified Answers) Plus Rationale 2026/2027
Q&A| Instant Download Pdf
A digester relieve valve is normally set to go off at:
A.) 5-7 PSI
B.)5-7 inches of air
C.) 5-7 inches of nitrogen
D.)5-7 inches of water - Answer-D.)5-7 inches of water
During photosynthesis:
A.)Carbon dioxide will increase
B.)DO will decrease
C.)Carbon dioxide will decrease
D.)Temperature will decrease - Answer-C.)Carbon dioxide
will decrease
If a digester sludge volatile solids increases:
A.) Gas production will drop
B.) The pH will immediately increase
,2|Page
C.) The digester could not go sour
D.) Gas production may increase - Answer-D.) Gas
production may increase
Total chlorine residual equals:
A.) Combined / free
B.) Free - combined
C.) Combined + free
D.) Free / combined - Answer-C.) Combined + free
Chlorine residual equals:
A.) Dose - demand
B.) Dose / demand
C.) (Dose) (demand)
D.) Demand - dose - Answer-A.) Dose - demand
The best velocity for a grit chamber is:
A.) 2fpm
B.) 1fpm
C.) 1 ft/second
, 3|Page
D.) 2 ft/second - Answer-C.) 1 ft/second
Clarifier weir overflow rate is expressed as:
A.) Cubic feet per day per square foot
B.) GPD/square ft
C.) GPD/ft
D.) GPD/cubic ft - Answer-C.) GPD/ft
Sludge gasification occurs in:
A.) Activated sludge basin
B.) Primary and secondary clarifiers
C.) Grit chamber
D.) Digester - Answer-B.) Primary and secondary clarifiers
If a plant chlorinates at the headworks:
A.) Chlorine residual will increase
B.)Chlorine demand at the disinfection basin will be
reduced
C.)Chlorine residual will decrease
D.)There will be no affect on the chlorine amount used -
Answer-B.)Chlorine demand at the disinfection basin will
be reduced
