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
,c
Ifc thec pumpc bearingsc onc horizontalc centrifugalc pumpsc arec overc lubricated,c thec mostc importa
ntc effectc isc thatc thec extrac lubricant
A.c willc resultc inc smootherc andc morec efficientc operationc ofc thec pump
B.c willc notc makec anyc differencec inc thec operationc ofc thec pump
C.c willc bec wasted
D.c shaſtc orc shaſtc sleevec willc bec damagedc -c CORRECTc ANSWERc -
D.c shaſtc orc shaſtc sleevec willc bec damaged
Ifc packingc isc notc maintainedc properly,
A.c cavitationc damagec willc result
B.c impellerc willc corrode
C.c lossc ofc suctionc duec toc airc beingc allowedc toc enterc pump
D.c shaſtc orc shaſtc sleevec willc bec damagedc -c CORRECTc ANSWERc -
C.c lossc ofc suctionc duec toc airc beingc allowedc toc enterc pump
Inc certainc situations,c ac supervisorc encouragesc thec employeesc toc makec theirc ownc decisions.c T
hisc isc consideredc toc be
A.c againstc thec rulesc toc followc pastc experiencesc inc decision-making
B.c badc formc sincec thec supervisorc eventuallyc losesc control
C.c highlyc desirable,c sincec itc encouragesc employeec growthc andc freesc the
D.c supervisorc forc otherc tasks
E.c passingc thec buckc -c CORRECTc ANSWERc -
C.c highlyc desirable,c sincec itc encouragesc employeec growth
Successfulc communicationc requiresc mutual
A.c agreement
B.c confusion
,c
C.c transmission
D.c understandingc -c CORRECTc ANSWERc -D.c understanding
Whenc ac greatc dealc ofc authorityc isc delegatedc onc manyc levels,c anc organizationc mayc bec descri
bedc as
A.c authoritarian
B.c centralized
C.c decentralized
D.c unstructuredc -c CORRECTc ANSWERc -C.c decentralized
Recognitionc andc jobc securityc arec indicationsc of
A.c ac goodc organization
B.c ac goodc supervisor
C.c externalc moralec factors
D.c internalc moralec factorsc -c CORRECTc ANSWERc -A.c ac goodc organization
Generally,c asc anc individualc progressesc upwardc inc management,c reliancec onc personalc technica
lc skill
A.c changesc toc thec morec complex
B.c decreases
C.c increases
D.c remainsc thec samec -c CORRECTc ANSWERc -B.c decreases
Specialc partsc thatc shouldc bec carriedc byc thec maintenancec workerc arec usuallyc listedc inc the
A.c machinec bluec print
B.c machinec historyc record
C.c machinec manufacturer'sc 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
,c
Ifc thec pumpc bearingsc onc horizontalc centrifugalc pumpsc arec overc lubricated,c thec mostc importa
ntc effectc isc thatc thec extrac lubricant
A.c willc resultc inc smootherc andc morec efficientc operationc ofc thec pump
B.c willc notc makec anyc differencec inc thec operationc ofc thec pump
C.c willc bec wasted
D.c shaſtc orc shaſtc sleevec willc bec damagedc -c CORRECTc ANSWERc -
D.c shaſtc orc shaſtc sleevec willc bec damaged
Ifc packingc isc notc maintainedc properly,
A.c cavitationc damagec willc result
B.c impellerc willc corrode
C.c lossc ofc suctionc duec toc airc beingc allowedc toc enterc pump
D.c shaſtc orc shaſtc sleevec willc bec damagedc -c CORRECTc ANSWERc -
C.c lossc ofc suctionc duec toc airc beingc allowedc toc enterc pump
Inc certainc situations,c ac supervisorc encouragesc thec employeesc toc makec theirc ownc decisions.c T
hisc isc consideredc toc be
A.c againstc thec rulesc toc followc pastc experiencesc inc decision-making
B.c badc formc sincec thec supervisorc eventuallyc losesc control
C.c highlyc desirable,c sincec itc encouragesc employeec growthc andc freesc the
D.c supervisorc forc otherc tasks
E.c passingc thec buckc -c CORRECTc ANSWERc -
C.c highlyc desirable,c sincec itc encouragesc employeec growth
Successfulc communicationc requiresc mutual
A.c agreement
B.c confusion
,c
C.c transmission
D.c understandingc -c CORRECTc ANSWERc -D.c understanding
Whenc ac greatc dealc ofc authorityc isc delegatedc onc manyc levels,c anc organizationc mayc bec descri
bedc as
A.c authoritarian
B.c centralized
C.c decentralized
D.c unstructuredc -c CORRECTc ANSWERc -C.c decentralized
Recognitionc andc jobc securityc arec indicationsc of
A.c ac goodc organization
B.c ac goodc supervisor
C.c externalc moralec factors
D.c internalc moralec factorsc -c CORRECTc ANSWERc -A.c ac goodc organization
Generally,c asc anc individualc progressesc upwardc inc management,c reliancec onc personalc technica
lc skill
A.c changesc toc thec morec complex
B.c decreases
C.c increases
D.c remainsc thec samec -c CORRECTc ANSWERc -B.c decreases
Specialc partsc thatc shouldc bec carriedc byc thec maintenancec workerc arec usuallyc listedc inc the
A.c machinec bluec print
B.c machinec historyc record
C.c machinec manufacturer'sc manual
