Wastewater Practice Exam with Questions and Answers – 100% Solved
A centrifugal pump must be ? or it will not pump - ✔✔✔-Primed
A sewer manhole provides access into the system for cleaning or services. A manhole is typically
located ? - ✔✔✔-At changes in alignment, diameter, grade, direction and intersection
A simple method for indication when to waste sludge is - ✔✔✔-Total sedimentation test
Approximately How many pounds does each person contribute of BOD to the system daily -
✔✔✔-0.17
Calculated the volume in gallons of a rectangular aeration tank that is 60 feet long, 30 feet wide
and 20 feet deep - ✔✔✔-269,280
Dangerous gases are produced during bacterial decomposition of organics in wastewater. The
main gases are - ✔✔✔-Hydrogen sulfide, carbon dioxide and methane
Effluent dosage of chlorine in the contact chamber must produce a total combined residual of ?
- ✔✔✔-1.0mg/L after 20 minutes
How many feet must new manholes have an inside diameter of? Entry access must be at least
how many inches? - ✔✔✔-4 feet and 30 inches
Identify the 3 basic types of lift stations - ✔✔✔-Dry, Wet and pneumatic
If the operator of a system received a call that a lift station is production of a strong smell of
"Rotten eggs" this would be an indication that - ✔✔✔-Hydrogen sulfide gas is present
In order to maintain 2 feet per second and velocity in a 6 inch main line, the fall per 100 feet of
pipe will be - ✔✔✔-0.50 percent or 6 inches
A centrifugal pump must be ? or it will not pump - ✔✔✔-Primed
A sewer manhole provides access into the system for cleaning or services. A manhole is typically
located ? - ✔✔✔-At changes in alignment, diameter, grade, direction and intersection
A simple method for indication when to waste sludge is - ✔✔✔-Total sedimentation test
Approximately How many pounds does each person contribute of BOD to the system daily -
✔✔✔-0.17
Calculated the volume in gallons of a rectangular aeration tank that is 60 feet long, 30 feet wide
and 20 feet deep - ✔✔✔-269,280
Dangerous gases are produced during bacterial decomposition of organics in wastewater. The
main gases are - ✔✔✔-Hydrogen sulfide, carbon dioxide and methane
Effluent dosage of chlorine in the contact chamber must produce a total combined residual of ?
- ✔✔✔-1.0mg/L after 20 minutes
How many feet must new manholes have an inside diameter of? Entry access must be at least
how many inches? - ✔✔✔-4 feet and 30 inches
Identify the 3 basic types of lift stations - ✔✔✔-Dry, Wet and pneumatic
If the operator of a system received a call that a lift station is production of a strong smell of
"Rotten eggs" this would be an indication that - ✔✔✔-Hydrogen sulfide gas is present
In order to maintain 2 feet per second and velocity in a 6 inch main line, the fall per 100 feet of
pipe will be - ✔✔✔-0.50 percent or 6 inches
