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
,z
Ifz thez pumpz bearingsz onz horizontalz centrifugalz pumpsz arez overz lubricated,z thez mostz importa
ntz effectz isz thatz thez extraz lubricant
A.z willz resultz inz smootherz andz morez efficientz operationz ofz thez pump
B.z willz notz makez anyz differencez inz thez operationz ofz thez pump
C.z willz bez wasted
D.z shaſtz orz shaſtz sleevez willz bez damagedz -z CORRECTz ANSWERz -
D.z shaſtz orz shaſtz sleevez willz bez damaged
Ifz packingz isz notz maintainedz properly,
A.z cavitationz damagez willz result
B.z impellerz willz corrode
C.z lossz ofz suctionz duez toz airz beingz allowedz toz enterz pump
D.z shaſtz orz shaſtz sleevez willz bez damagedz -z CORRECTz ANSWERz -
C.z lossz ofz suctionz duez toz airz beingz allowedz toz enterz pump
Inz certainz situations,z az supervisorz encouragesz thez employeesz toz makez theirz ownz decisions.z T
hisz isz consideredz toz be
A.z againstz thez rulesz toz followz pastz experiencesz inz decision-making
B.z badz formz sincez thez supervisorz eventuallyz losesz control
C.z highlyz desirable,z sincez itz encouragesz employeez growthz andz freesz the
D.z supervisorz forz otherz tasks
E.z passingz thez buckz -z CORRECTz ANSWERz -
C.z highlyz desirable,z sincez itz encouragesz employeez growth
Successfulz communicationz requiresz mutual
A.z agreement
B.z confusion
,z
C.z transmission
D.z understandingz -z CORRECTz ANSWERz -D.z understanding
Whenz az greatz dealz ofz authorityz isz delegatedz onz manyz levels,z anz organizationz mayz bez descri
bedz as
A.z authoritarian
B.z centralized
C.z decentralized
D.z unstructuredz -z CORRECTz ANSWERz -C.z decentralized
Recognitionz andz jobz securityz arez indicationsz of
A.z az goodz organization
B.z az goodz supervisor
C.z externalz moralez factors
D.z internalz moralez factorsz -z CORRECTz ANSWERz -A.z az goodz organization
Generally,z asz anz individualz progressesz upwardz inz management,z reliancez onz personalz technica
lz skill
A.z changesz toz thez morez complex
B.z decreases
C.z increases
D.z remainsz thez samez -z CORRECTz ANSWERz -B.z decreases
Specialz partsz thatz shouldz bez carriedz byz thez maintenancez workerz arez usuallyz listedz inz the
A.z machinez bluez print
B.z machinez historyz record
C.z machinez manufacturer'sz 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
,z
Ifz thez pumpz bearingsz onz horizontalz centrifugalz pumpsz arez overz lubricated,z thez mostz importa
ntz effectz isz thatz thez extraz lubricant
A.z willz resultz inz smootherz andz morez efficientz operationz ofz thez pump
B.z willz notz makez anyz differencez inz thez operationz ofz thez pump
C.z willz bez wasted
D.z shaſtz orz shaſtz sleevez willz bez damagedz -z CORRECTz ANSWERz -
D.z shaſtz orz shaſtz sleevez willz bez damaged
Ifz packingz isz notz maintainedz properly,
A.z cavitationz damagez willz result
B.z impellerz willz corrode
C.z lossz ofz suctionz duez toz airz beingz allowedz toz enterz pump
D.z shaſtz orz shaſtz sleevez willz bez damagedz -z CORRECTz ANSWERz -
C.z lossz ofz suctionz duez toz airz beingz allowedz toz enterz pump
Inz certainz situations,z az supervisorz encouragesz thez employeesz toz makez theirz ownz decisions.z T
hisz isz consideredz toz be
A.z againstz thez rulesz toz followz pastz experiencesz inz decision-making
B.z badz formz sincez thez supervisorz eventuallyz losesz control
C.z highlyz desirable,z sincez itz encouragesz employeez growthz andz freesz the
D.z supervisorz forz otherz tasks
E.z passingz thez buckz -z CORRECTz ANSWERz -
C.z highlyz desirable,z sincez itz encouragesz employeez growth
Successfulz communicationz requiresz mutual
A.z agreement
B.z confusion
,z
C.z transmission
D.z understandingz -z CORRECTz ANSWERz -D.z understanding
Whenz az greatz dealz ofz authorityz isz delegatedz onz manyz levels,z anz organizationz mayz bez descri
bedz as
A.z authoritarian
B.z centralized
C.z decentralized
D.z unstructuredz -z CORRECTz ANSWERz -C.z decentralized
Recognitionz andz jobz securityz arez indicationsz of
A.z az goodz organization
B.z az goodz supervisor
C.z externalz moralez factors
D.z internalz moralez factorsz -z CORRECTz ANSWERz -A.z az goodz organization
Generally,z asz anz individualz progressesz upwardz inz management,z reliancez onz personalz technica
lz skill
A.z changesz toz thez morez complex
B.z decreases
C.z increases
D.z remainsz thez samez -z CORRECTz ANSWERz -B.z decreases
Specialz partsz thatz shouldz bez carriedz byz thez maintenancez workerz arez usuallyz listedz inz the
A.z machinez bluez print
B.z machinez historyz record
C.z machinez manufacturer'sz manual
