ABC Wastewater Collection System Operator Iii
Questions with Correct Answers 2026/2027
Turbidity in wastewater is caused by
A. color
B. dissolved calcium
C. hardness
D. finely divided suspended material - CORRECT ANSWER -
D. finely divided suspended material
The gas most commonly associated with septic wastewater is
A. carbon dioxide
B. carbon monoxide
C. hydrogen sulfide
D. methane - CORRECT ANSWER -C. hydrogen sulfide
How many cubic meters per second in 10 MGD?
A. 0.44
B. 1.44
C. 4.73
D. 24.62 - CORRECT ANSWER -A. 0.44
Mechanical ventilation of a liſt station is required to
A. lower temperatures to reduce proportion of hydrogen sulfide
B. reduce chlorine demand
C. reduce corrosion
D. increase DO in raw wastewater - CORRECT ANSWER -C. reduce corrosion
,A wet well probe is usually used for ________ determination(s) of level.
A. approximate
B. dual point
C. continuous
D. single point - CORRECT ANSWER -D. single point
A pump is delivering at less than the expected rate of discharge. Which of the causes listed
below is incorrect?
A. speed of motor too low
B. pump not primed
C. impeller clogged
D. discharge head too low - CORRECT ANSWER -D. discharge head too low
Metal pipes oſten fail because of
A. back siphonage
B. browning movement
C. galvanic action
D. reverse osmosis - CORRECT ANSWER -C. galvanic action
When a fire hydrant is operated, it should be
A. just opened enough to have a flow
B. opened fully
C. opened halfway
D. regulated to flow required - CORRECT ANSWER -B. opened fully
,x
Ifx thex pumpx bearingsx onx horizontalx centrifugalx pumpsx arex overx lubricated,x thex mostx import
a
ntx effectx isx thatx thex extrax lubricant
A.x willx resultx inx smootherx andx morex efficientx operationx ofx thex pump
B.x willx notx makex anyx differencex inx thex operationx ofx thex pump
C.x willx bex wasted
D.x shaſtx orx shaſtx sleevex willx bex damagedx -x CORRECTx ANSWERx -
D.x shaſtx orx shaſtx sleevex willx bex damaged
Ifx packingx isx notx maintainedx properly,
A.x cavitationx damagex willx result
B.x impellerx willx corrode
C.x lossx ofx suctionx duex tox airx beingx allowedx tox enterx pump
D.x shaſtx orx shaſtx sleevex willx bex damagedx -x CORRECTx ANSWERx -
C.x lossx ofx suctionx duex tox airx beingx allowedx tox enterx pump
Inx certainx situations,x ax supervisorx encouragesx thex employeesx tox makex theirx ownx decisions.x
T
hisx isx consideredx tox be
A.x againstx thex rulesx tox followx pastx experiencesx inx decision-making
B.x badx formx sincex thex supervisorx eventuallyx losesx control
C.x highlyx desirable,x sincex itx encouragesx employeex growthx andx freesx the
D.x supervisorx forx otherx tasks
E.x passingx thex buckx -x CORRECTx ANSWERx -
C.x highlyx desirable,x sincex itx encouragesx employeex growth
Successfulx communicationx requiresx mutual
A.x agreement
B.x confusion
,x
C.x transmission
D.x understandingx -x CORRECTx ANSWERx -D.x understanding
Whenx ax greatx dealx ofx authorityx isx delegatedx onx manyx levels,x anx organizationx mayx bex desc
ri
bedx as
A.x authoritarian
B.x centralized
C.x decentralized
D.x unstructuredx -x CORRECTx ANSWERx -C.x decentralized
Recognitionx andx jobx securityx arex indicationsx of
A.x ax goodx organization
B.x ax goodx supervisor
C.x externalx moralex factors
D.x internalx moralex factorsx -x CORRECTx ANSWERx -A.x ax goodx organization
Generally,x asx anx individualx progressesx upwardx inx management,x reliancex onx personalx technica
lx skill
A.x changesx tox thex morex complex
B.x decreases
C.x increases
D.x remainsx thex samex -x CORRECTx ANSWERx -B.x decreases
Specialx partsx thatx shouldx bex carriedx byx thex maintenancex workerx arex usuallyx listedx inx th
e
A.x machinex bluex print
B.x machinex historyx record
C.x machinex manufacturer'sx manual
Questions with Correct Answers 2026/2027
Turbidity in wastewater is caused by
A. color
B. dissolved calcium
C. hardness
D. finely divided suspended material - CORRECT ANSWER -
D. finely divided suspended material
The gas most commonly associated with septic wastewater is
A. carbon dioxide
B. carbon monoxide
C. hydrogen sulfide
D. methane - CORRECT ANSWER -C. hydrogen sulfide
How many cubic meters per second in 10 MGD?
A. 0.44
B. 1.44
C. 4.73
D. 24.62 - CORRECT ANSWER -A. 0.44
Mechanical ventilation of a liſt station is required to
A. lower temperatures to reduce proportion of hydrogen sulfide
B. reduce chlorine demand
C. reduce corrosion
D. increase DO in raw wastewater - CORRECT ANSWER -C. reduce corrosion
,A wet well probe is usually used for ________ determination(s) of level.
A. approximate
B. dual point
C. continuous
D. single point - CORRECT ANSWER -D. single point
A pump is delivering at less than the expected rate of discharge. Which of the causes listed
below is incorrect?
A. speed of motor too low
B. pump not primed
C. impeller clogged
D. discharge head too low - CORRECT ANSWER -D. discharge head too low
Metal pipes oſten fail because of
A. back siphonage
B. browning movement
C. galvanic action
D. reverse osmosis - CORRECT ANSWER -C. galvanic action
When a fire hydrant is operated, it should be
A. just opened enough to have a flow
B. opened fully
C. opened halfway
D. regulated to flow required - CORRECT ANSWER -B. opened fully
,x
Ifx thex pumpx bearingsx onx horizontalx centrifugalx pumpsx arex overx lubricated,x thex mostx import
a
ntx effectx isx thatx thex extrax lubricant
A.x willx resultx inx smootherx andx morex efficientx operationx ofx thex pump
B.x willx notx makex anyx differencex inx thex operationx ofx thex pump
C.x willx bex wasted
D.x shaſtx orx shaſtx sleevex willx bex damagedx -x CORRECTx ANSWERx -
D.x shaſtx orx shaſtx sleevex willx bex damaged
Ifx packingx isx notx maintainedx properly,
A.x cavitationx damagex willx result
B.x impellerx willx corrode
C.x lossx ofx suctionx duex tox airx beingx allowedx tox enterx pump
D.x shaſtx orx shaſtx sleevex willx bex damagedx -x CORRECTx ANSWERx -
C.x lossx ofx suctionx duex tox airx beingx allowedx tox enterx pump
Inx certainx situations,x ax supervisorx encouragesx thex employeesx tox makex theirx ownx decisions.x
T
hisx isx consideredx tox be
A.x againstx thex rulesx tox followx pastx experiencesx inx decision-making
B.x badx formx sincex thex supervisorx eventuallyx losesx control
C.x highlyx desirable,x sincex itx encouragesx employeex growthx andx freesx the
D.x supervisorx forx otherx tasks
E.x passingx thex buckx -x CORRECTx ANSWERx -
C.x highlyx desirable,x sincex itx encouragesx employeex growth
Successfulx communicationx requiresx mutual
A.x agreement
B.x confusion
,x
C.x transmission
D.x understandingx -x CORRECTx ANSWERx -D.x understanding
Whenx ax greatx dealx ofx authorityx isx delegatedx onx manyx levels,x anx organizationx mayx bex desc
ri
bedx as
A.x authoritarian
B.x centralized
C.x decentralized
D.x unstructuredx -x CORRECTx ANSWERx -C.x decentralized
Recognitionx andx jobx securityx arex indicationsx of
A.x ax goodx organization
B.x ax goodx supervisor
C.x externalx moralex factors
D.x internalx moralex factorsx -x CORRECTx ANSWERx -A.x ax goodx organization
Generally,x asx anx individualx progressesx upwardx inx management,x reliancex onx personalx technica
lx skill
A.x changesx tox thex morex complex
B.x decreases
C.x increases
D.x remainsx thex samex -x CORRECTx ANSWERx -B.x decreases
Specialx partsx thatx shouldx bex carriedx byx thex maintenancex workerx arex usuallyx listedx inx th
e
A.x machinex bluex print
B.x machinex historyx record
C.x machinex manufacturer'sx manual
