WASTEWATER COLLECTIONS III
EXAMINATION
TEST 2026 QUESTIONS WITH SOLUTIONS
GRADED A+
◉ Why should the design of a lift station take into consideration any
humid atmosphere in the station? Answer: 1. To avoid making
operators sweat profusely.
2. To keep moisture from hindering light passing through the
window.
3. To minimize corrosion damage.
4. To prevent the need to remove water condensation from the
humidity.
◉ What is a major favorable feature of a dry well pump station?
Answer: 1. Allows operators easy access to remove debris.
2. Minimize cost of construction due to simplicity.
3. Provides a cleaner and safer environment for operation and
maintenance personnel.
4. Requires only one well for wastewater and equipment
◉ Why are there provisions in some lift stations for wet well
aeration during low-flow period? Answer: 1. To enhance
performance of anoxic selectors.
,2. To help keep detained wastewater fresh.
3. To increase hydrogen sulfide production.
4. To maintain corrosion processes.
◉ What happens if a wet well is too large? Answer: 1. Cavitation will
be a problem.
2. Pumps will operate too frequently.
3. Solids will tend to accumulate on the bottom.
4. Wet well maintenance will be minimized.
◉ A ground-fault circuit interrupter (GFCI) is designed to limit
electric shock to a current and time duration value below what
level? Answer: 1. That which can cause ignition of clothing. 2.
That which can create minor pain sensations.
3. That which can pass through your body.
4. That which can produce serious injury.
◉ How are programmable logic controllers (PLCs) usually
programmed? Answer: 1. Using a laptop computer.
2. Using formatted computer language codes.
3. Using software simulation codes.
4. Using textbook logic.
,◉ What happens when a seal fails on a submersible pump? Answer:
1. Wastewater back flows into potable water supply and
contaminates the water.
2. Wastewater leaks into the dry well and cause electrical outages.
3. Wastewater overflows the seal and causes adverse environmental
impacts.
4. Wastewater penetrates the motor compartment and burns or
shorts out the motor.
◉ Why should large horizontal pumps have a vent valve on top of
the volute? Answer: 1. For priming purposes.
2. For purpose of preventing water
hammer.
3. To prevent for formation of vacuum.
4. To release entrained air.
◉ What is the main purpose of gate valves in a lift station? Answer:
1. To check the pump efficiency on the pump curve.
2. To function as a check valve when the check valves fail.
3. To isolate the pump from the force main during pump or check
valve maintenance.
4. To throttle pumped flows to avoid overloading the sewer system.
, ◉ What is the main purpose of a check valve? Answer: 1. To prevent
damage from pump cavitation.
2. To prevent operators from checking on pump maintenance.
3. To prevent the force main from draining back into the wet well.
4. To prevent the pump from pumping excess flows.
◉ Why should operations and maintenance operators be given the
opportunity to review the prints and specifications of a new lift
station before the award of a contract for new construction? Answer:
1. To allow operations to learn how to design lift stations.
2. To be sure adequate provisions have been made for the station to
be be easily and probably operated and maintained.
3. To comment on the reliability of the specified equipment
manufacturers.
4. To promote communities between design engineers and operation
and maintenance operations.
◉ Why should the lowest home in the wastewater collection system
be identified? Answer: 1. Homeowners most likely to be unable to
pay sewer use rate fees.
2. Homes will probably be closest to lift station and owners will
complain of odors.
3. Most probable backup points.
4. Sump pumps serving homes will require greatest maintenance.
EXAMINATION
TEST 2026 QUESTIONS WITH SOLUTIONS
GRADED A+
◉ Why should the design of a lift station take into consideration any
humid atmosphere in the station? Answer: 1. To avoid making
operators sweat profusely.
2. To keep moisture from hindering light passing through the
window.
3. To minimize corrosion damage.
4. To prevent the need to remove water condensation from the
humidity.
◉ What is a major favorable feature of a dry well pump station?
Answer: 1. Allows operators easy access to remove debris.
2. Minimize cost of construction due to simplicity.
3. Provides a cleaner and safer environment for operation and
maintenance personnel.
4. Requires only one well for wastewater and equipment
◉ Why are there provisions in some lift stations for wet well
aeration during low-flow period? Answer: 1. To enhance
performance of anoxic selectors.
,2. To help keep detained wastewater fresh.
3. To increase hydrogen sulfide production.
4. To maintain corrosion processes.
◉ What happens if a wet well is too large? Answer: 1. Cavitation will
be a problem.
2. Pumps will operate too frequently.
3. Solids will tend to accumulate on the bottom.
4. Wet well maintenance will be minimized.
◉ A ground-fault circuit interrupter (GFCI) is designed to limit
electric shock to a current and time duration value below what
level? Answer: 1. That which can cause ignition of clothing. 2.
That which can create minor pain sensations.
3. That which can pass through your body.
4. That which can produce serious injury.
◉ How are programmable logic controllers (PLCs) usually
programmed? Answer: 1. Using a laptop computer.
2. Using formatted computer language codes.
3. Using software simulation codes.
4. Using textbook logic.
,◉ What happens when a seal fails on a submersible pump? Answer:
1. Wastewater back flows into potable water supply and
contaminates the water.
2. Wastewater leaks into the dry well and cause electrical outages.
3. Wastewater overflows the seal and causes adverse environmental
impacts.
4. Wastewater penetrates the motor compartment and burns or
shorts out the motor.
◉ Why should large horizontal pumps have a vent valve on top of
the volute? Answer: 1. For priming purposes.
2. For purpose of preventing water
hammer.
3. To prevent for formation of vacuum.
4. To release entrained air.
◉ What is the main purpose of gate valves in a lift station? Answer:
1. To check the pump efficiency on the pump curve.
2. To function as a check valve when the check valves fail.
3. To isolate the pump from the force main during pump or check
valve maintenance.
4. To throttle pumped flows to avoid overloading the sewer system.
, ◉ What is the main purpose of a check valve? Answer: 1. To prevent
damage from pump cavitation.
2. To prevent operators from checking on pump maintenance.
3. To prevent the force main from draining back into the wet well.
4. To prevent the pump from pumping excess flows.
◉ Why should operations and maintenance operators be given the
opportunity to review the prints and specifications of a new lift
station before the award of a contract for new construction? Answer:
1. To allow operations to learn how to design lift stations.
2. To be sure adequate provisions have been made for the station to
be be easily and probably operated and maintained.
3. To comment on the reliability of the specified equipment
manufacturers.
4. To promote communities between design engineers and operation
and maintenance operations.
◉ Why should the lowest home in the wastewater collection system
be identified? Answer: 1. Homeowners most likely to be unable to
pay sewer use rate fees.
2. Homes will probably be closest to lift station and owners will
complain of odors.
3. Most probable backup points.
4. Sump pumps serving homes will require greatest maintenance.
