Wastewater collections Exam Questions
with Answers
True or False
persons responsible for the operation and maintenance of wastewater collection systems
usually are the ones responsible for the design and construction of these systems. - ✔✔false
True or False
the wastewater in collection systems is usually conveyed by pumping. - ✔✔false
True or False
inflow is the seepage of groundwater into a sewer system, including service connections. -
✔✔false
True or False
velocities in sewers should be calculated in the office to be sure actual velocities are high
enough to prevent the deposition of solids. - ✔✔false
True or False
knowledge of the daily and annual variations or fluctuations in a collection system's wastewater
flow is useful in planning maintenance programs for the system. - ✔✔true
True or False
the amount of support provided the sewer pipe by the sides of a trench decreases as the width
of the trench increases. - ✔✔true
True or False
steel pipe is rarely used for force mains. - ✔✔false
, True or False
polyvinyl chloride (pvc) pipe is used for both gravity and pressure sanitary sewers. - ✔✔true
True or False
in order to make and effective design review, and operator must be familiar with the elements
of design that can create problems during the life of the collection system. - ✔✔true
why should collection system operators have a basic knowledge of how engineers design
collection systems?
1) to design collection systems
2) to do a better job
3) to estimate costs of construction projects
4) to prepare plans and specifications - ✔✔to do a better job
how are flow velocities estimated in existing sewers flowing partially full?
1) computer models
2) floats
3) manning's formula
4) velocity meters - ✔✔floats
what is the purpose of the grinder pumps?
1) to lift the pumped flows into a gravity flow system
2) to measure the flows pumped into the collection system
3) to pressurize the wastewater to help move it through the collection system
4) to pump sludge into the collection system from holding tanks - ✔✔to pressurize the
wastewater to help move it through the collection system
with Answers
True or False
persons responsible for the operation and maintenance of wastewater collection systems
usually are the ones responsible for the design and construction of these systems. - ✔✔false
True or False
the wastewater in collection systems is usually conveyed by pumping. - ✔✔false
True or False
inflow is the seepage of groundwater into a sewer system, including service connections. -
✔✔false
True or False
velocities in sewers should be calculated in the office to be sure actual velocities are high
enough to prevent the deposition of solids. - ✔✔false
True or False
knowledge of the daily and annual variations or fluctuations in a collection system's wastewater
flow is useful in planning maintenance programs for the system. - ✔✔true
True or False
the amount of support provided the sewer pipe by the sides of a trench decreases as the width
of the trench increases. - ✔✔true
True or False
steel pipe is rarely used for force mains. - ✔✔false
, True or False
polyvinyl chloride (pvc) pipe is used for both gravity and pressure sanitary sewers. - ✔✔true
True or False
in order to make and effective design review, and operator must be familiar with the elements
of design that can create problems during the life of the collection system. - ✔✔true
why should collection system operators have a basic knowledge of how engineers design
collection systems?
1) to design collection systems
2) to do a better job
3) to estimate costs of construction projects
4) to prepare plans and specifications - ✔✔to do a better job
how are flow velocities estimated in existing sewers flowing partially full?
1) computer models
2) floats
3) manning's formula
4) velocity meters - ✔✔floats
what is the purpose of the grinder pumps?
1) to lift the pumped flows into a gravity flow system
2) to measure the flows pumped into the collection system
3) to pressurize the wastewater to help move it through the collection system
4) to pump sludge into the collection system from holding tanks - ✔✔to pressurize the
wastewater to help move it through the collection system
