WASTE WATER D LICENSE EXAM STUDY GUIDE QUESTIONS
WITH FULLY SOLVED ANSWERS 2025.
Wastewater flowing into a collection system should come from -- Answer ✔✔ homes
_ _ _ _ _ _ _ _ _ _ _ _ _
and businesses and industry
_ _ _
Install waste water lines no closer to a water line then _________ ft. -- Answer ✔✔ 9
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
ft.
If the trench is _______________ feet or deeper, a means of exits is required. --
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Answer ✔✔ 4ft. _ _
If a ladder is used, it must be portable and extend ______________ feet above the
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
trench, in addition to being secured. -- Answer ✔✔ 3ft
_ _ _ _ _ _ _ _ _
A ladder must be within ___________________ feet of anyone in the trench. --
_ _ _ _ _ _ _ _ _ _ _ _ _
Answer ✔✔ 25ft _ _
Excavation spoil must be at least ________________ feet from the edge of the trench -
_ _ _ _ _ _ _ _ _ _ _ _ _ _
- Answer ✔✔ 2ft
_ _ _
The primary cause of stoppages is roots or ______________ -- Answer ✔✔ Grease
_ _ _ _ _ _ _ _ _ _ _ _
Wastewater cleaning can increase pipe capacity, prevent septic conditions, maintain flow
_ _ _ _ _ _ _ _ _ _ _
velocity, and ___________ -- Answer ✔✔ Reduce stoppages
_ _ _ _ _ _ _
Hydraulic cleaners (jetting units) use ______________ under pressure, which is forced
_ _ _ _ _ _ _ _ _ _ _
through nozzles. -- Answer ✔✔ Water _ _ _ _ _
Maps should be as built, showing corrections made in the field during
_ _ _ _ _ _ _ _ _ _ _ _
_________________ -- Answer ✔✔ Constructions _ _ _ _
,When chemicals are used in the system, consider worker and public
_ _ _ _ _ _ _ _ _ _ _
_______________. -- Answer ✔✔ Safety _ _ _ _
When wastewater cannot flow to treatment by ________________, a lift station is
_ _ _ _ _ _ _ _ _ _ _ _
used. -- Answer ✔✔ Gravity.
_ _ _ _
Lift station designs include _______________ -- Answer ✔✔ Wet well dry well
_ _ _ _ _ _ _ _ _ _ _ _
pneumatic ejector _
Dry well stations have the ________________ and pumps in a dry well separated from
_ _ _ _ _ _ _ _ _ _ _ _ _ _
the adjacent wet well -- Answer ✔✔ Motors
_ _ _ _ _ _ _
The _____________ pump is most commonly used in a lift station -- Answer ✔✔
_ _ _ _ _ _ _ _ _ _ _ _ _ _
Centrifugal
Foreign matter in the ________________ can cause noisy operation and should be
_ _ _ _ _ _ _ _ _ _ _ _
investigated. -- Answer ✔✔ Impeller _ _ _ _
The centrifugal pump must be _______________ or it will not pump -- Answer ✔✔
_ _ _ _ _ _ _ _ _ _ _ _ _ _
Primed
Discharge valves on a positive displacement pump must be ______________ -- Answer
_ _ _ _ _ _ _ _ _ _ _
✔✔ Open
_ _
The ________________ valve, usually a swing type, prevents water on the discharge
_ _ _ _ _ _ _ _ _ _ _ _
side of the pump from flowing backwards through the pump when it is off. -- Answer
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
✔✔ Check_
The best design of isolation valve is the _________________ valve because it leaves an
_ _ _ _ _ _ _ _ _ _ _ _ _ _
unrestricted path when fully open. -- Answer ✔✔ Gate_ _ _ _ _ _ _ _
The ____________ valve is the most commonly used valve in the collection system. --
_ _ _ _ _ _ _ _ _ _ _ _ _ _
Answer ✔✔ Gate _ _
, Motors used in wastewater are typically three-phase ______________ motors. --
_ _ _ _ _ _ _ _ _ _
Answer ✔✔ Induction _ _
The speed of an electric motor is measured in _______________. -- Answer ✔✔ Rpm
_ _ _ _ _ _ _ _ _ _ _ _ _
To reduce gases, the TCEQ requires lift stations to have a ______________ system --
_ _ _ _ _ _ _ _ _ _ _ _ _ _
Answer ✔✔ Ventilation _ _
Hydrogen sulfide is very toxic and deadens the sense of ___________ -- Answer ✔✔
_ _ _ _ _ _ _ _ _ _ _ _ _ _
Smell
If a pump loses prime, it will heat up and damage the _________________ -- Answer
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
✔✔ Seal _
Common methods to detect liquids depths and control pumps are _______________,
_ _ _ _ _ _ _ _ _ _ _
pneumatic bubblers, electric probes, and ultrasonic sensors -- Answer ✔✔ Floats
_ _ _ _ _ _ _ _ _ _
______________ pump in dry wells collect packing seal leakage as well as cleanup _ _ _ _ _ _ _ _ _ _ _ _ _
water. -- Answer ✔✔ Sump_ _ _ _
A _______________ maintenance program keeps emergency repairs to a minimum. --
_ _ _ _ _ _ _ _ _ _ _
Answer ✔✔ Preventive _ _
__________________ are important to lift station and maintenance -- Answer ✔✔ _ _ _ _ _ _ _ _ _ _ _
Records
Records include a ____________ checklist -- Answer ✔✔ Daily
_ _ _ _ _ _ _ _
Preliminary treatment is usually the first step in the treatment process -- Answer ✔✔
_ _ _ _ _ _ _ _ _ _ _ _ _ _
True
Before making screen repairs, the power should be turned off and the controls locked. --
_ _ _ _ _ _ _ _ _ _ _ _ _ _
Answer ✔✔ True
_ _ _
Types of grinding units include comminutor and barminutor -- Answer ✔✔ True
_ _ _ _ _ _ _ _ _ _ _
WITH FULLY SOLVED ANSWERS 2025.
Wastewater flowing into a collection system should come from -- Answer ✔✔ homes
_ _ _ _ _ _ _ _ _ _ _ _ _
and businesses and industry
_ _ _
Install waste water lines no closer to a water line then _________ ft. -- Answer ✔✔ 9
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
ft.
If the trench is _______________ feet or deeper, a means of exits is required. --
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Answer ✔✔ 4ft. _ _
If a ladder is used, it must be portable and extend ______________ feet above the
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
trench, in addition to being secured. -- Answer ✔✔ 3ft
_ _ _ _ _ _ _ _ _
A ladder must be within ___________________ feet of anyone in the trench. --
_ _ _ _ _ _ _ _ _ _ _ _ _
Answer ✔✔ 25ft _ _
Excavation spoil must be at least ________________ feet from the edge of the trench -
_ _ _ _ _ _ _ _ _ _ _ _ _ _
- Answer ✔✔ 2ft
_ _ _
The primary cause of stoppages is roots or ______________ -- Answer ✔✔ Grease
_ _ _ _ _ _ _ _ _ _ _ _
Wastewater cleaning can increase pipe capacity, prevent septic conditions, maintain flow
_ _ _ _ _ _ _ _ _ _ _
velocity, and ___________ -- Answer ✔✔ Reduce stoppages
_ _ _ _ _ _ _
Hydraulic cleaners (jetting units) use ______________ under pressure, which is forced
_ _ _ _ _ _ _ _ _ _ _
through nozzles. -- Answer ✔✔ Water _ _ _ _ _
Maps should be as built, showing corrections made in the field during
_ _ _ _ _ _ _ _ _ _ _ _
_________________ -- Answer ✔✔ Constructions _ _ _ _
,When chemicals are used in the system, consider worker and public
_ _ _ _ _ _ _ _ _ _ _
_______________. -- Answer ✔✔ Safety _ _ _ _
When wastewater cannot flow to treatment by ________________, a lift station is
_ _ _ _ _ _ _ _ _ _ _ _
used. -- Answer ✔✔ Gravity.
_ _ _ _
Lift station designs include _______________ -- Answer ✔✔ Wet well dry well
_ _ _ _ _ _ _ _ _ _ _ _
pneumatic ejector _
Dry well stations have the ________________ and pumps in a dry well separated from
_ _ _ _ _ _ _ _ _ _ _ _ _ _
the adjacent wet well -- Answer ✔✔ Motors
_ _ _ _ _ _ _
The _____________ pump is most commonly used in a lift station -- Answer ✔✔
_ _ _ _ _ _ _ _ _ _ _ _ _ _
Centrifugal
Foreign matter in the ________________ can cause noisy operation and should be
_ _ _ _ _ _ _ _ _ _ _ _
investigated. -- Answer ✔✔ Impeller _ _ _ _
The centrifugal pump must be _______________ or it will not pump -- Answer ✔✔
_ _ _ _ _ _ _ _ _ _ _ _ _ _
Primed
Discharge valves on a positive displacement pump must be ______________ -- Answer
_ _ _ _ _ _ _ _ _ _ _
✔✔ Open
_ _
The ________________ valve, usually a swing type, prevents water on the discharge
_ _ _ _ _ _ _ _ _ _ _ _
side of the pump from flowing backwards through the pump when it is off. -- Answer
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
✔✔ Check_
The best design of isolation valve is the _________________ valve because it leaves an
_ _ _ _ _ _ _ _ _ _ _ _ _ _
unrestricted path when fully open. -- Answer ✔✔ Gate_ _ _ _ _ _ _ _
The ____________ valve is the most commonly used valve in the collection system. --
_ _ _ _ _ _ _ _ _ _ _ _ _ _
Answer ✔✔ Gate _ _
, Motors used in wastewater are typically three-phase ______________ motors. --
_ _ _ _ _ _ _ _ _ _
Answer ✔✔ Induction _ _
The speed of an electric motor is measured in _______________. -- Answer ✔✔ Rpm
_ _ _ _ _ _ _ _ _ _ _ _ _
To reduce gases, the TCEQ requires lift stations to have a ______________ system --
_ _ _ _ _ _ _ _ _ _ _ _ _ _
Answer ✔✔ Ventilation _ _
Hydrogen sulfide is very toxic and deadens the sense of ___________ -- Answer ✔✔
_ _ _ _ _ _ _ _ _ _ _ _ _ _
Smell
If a pump loses prime, it will heat up and damage the _________________ -- Answer
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
✔✔ Seal _
Common methods to detect liquids depths and control pumps are _______________,
_ _ _ _ _ _ _ _ _ _ _
pneumatic bubblers, electric probes, and ultrasonic sensors -- Answer ✔✔ Floats
_ _ _ _ _ _ _ _ _ _
______________ pump in dry wells collect packing seal leakage as well as cleanup _ _ _ _ _ _ _ _ _ _ _ _ _
water. -- Answer ✔✔ Sump_ _ _ _
A _______________ maintenance program keeps emergency repairs to a minimum. --
_ _ _ _ _ _ _ _ _ _ _
Answer ✔✔ Preventive _ _
__________________ are important to lift station and maintenance -- Answer ✔✔ _ _ _ _ _ _ _ _ _ _ _
Records
Records include a ____________ checklist -- Answer ✔✔ Daily
_ _ _ _ _ _ _ _
Preliminary treatment is usually the first step in the treatment process -- Answer ✔✔
_ _ _ _ _ _ _ _ _ _ _ _ _ _
True
Before making screen repairs, the power should be turned off and the controls locked. --
_ _ _ _ _ _ _ _ _ _ _ _ _ _
Answer ✔✔ True
_ _ _
Types of grinding units include comminutor and barminutor -- Answer ✔✔ True
_ _ _ _ _ _ _ _ _ _ _
