Operation and Maintenance of
Wastewater Collection System Volume
I
Lift station. What is the most important requirement of a lift station? - CORRECT
ANSWER-1. Economics .
2. Operation and maintenance.
3. Reliability.
4. Safety.
Why should the design of a lift station take into consideration any humid atmosphere in
the station? - CORRECT 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? - CORRECT 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? - CORRECT 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? - CORRECT 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? - CORRECT 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? - CORRECT
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? - CORRECT 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? - CORRECT
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? - CORRECT 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? - CORRECT 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? - CORRECT ANSWER-1. To allow operations to learn how to design lift
stations.
Wastewater Collection System Volume
I
Lift station. What is the most important requirement of a lift station? - CORRECT
ANSWER-1. Economics .
2. Operation and maintenance.
3. Reliability.
4. Safety.
Why should the design of a lift station take into consideration any humid atmosphere in
the station? - CORRECT 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? - CORRECT 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? - CORRECT 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? - CORRECT 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? - CORRECT 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? - CORRECT
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? - CORRECT 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? - CORRECT
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? - CORRECT 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? - CORRECT 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? - CORRECT ANSWER-1. To allow operations to learn how to design lift
stations.
