MAINTENANCE OF WASTEWATER
COLLECTION SYSTEM QUESTIONS
WITH CORRECT ANSWERS
2025/2026
Whenaaafireahydrantaisaoperated,aitashouldabea-
acorrectaanswersa.aJustaopenedaenoughatoahaveaflowa
b.aOpenedafullya
c.aOpenedahalfwaya
d.aRegulatedatoatheaflowarequired
WhichaofatheafollowingaisatheaMOSTacommonafactoraleadingatoatheagenerationaofahydrogenasulf
ideainasewers?a-acorrectaanswersa.aAnaerobicaconditionsa
b.aConstantahighavelocityaofaflowainasewersa
c.aLowaconcentrationsaofaferrousasulfidesa
d.aPresenceaofafats,aoilsaandagrease
EmergencyastoppagesainaseweralinesamayaNOTabeaclearedasafetyabyatheauseaofa-
acorrectaanswersa.aHandarods
b.aHighavelocityaofaflowainasewersa
c.aPoweraroddersa
d.aFireahoses
Youaareatheaoperatoraofaaahighavelocityacleaneraattemptingatoabreakaaastoppage.aTheadistanceao
fathealeaderahoseaandanozzleaonayourapressurealineaisa17afeet.aYouasetatheafootageacounteratoare
ada"zero"aasathealeaderahoseacouplingaentersatheapipe.aWhenatheacounterareadsa124afeetayouah
itaanaobstructionaandacanagoanoafurther.aApproximatelyahowafaraisaobstructionafromatheamanho
le?a-acorrectaanswersa.a124afeeta
b.a141afeeta
c.a107afeeta
d.a163afeet
Bucketamachineaareabestausedaforathearemovalaofa-acorrectaanswersa.aGreasea
b.aRootsa
c.aDebrisa
COLLECTION SYSTEM QUESTIONS
WITH CORRECT ANSWERS
2025/2026
Whenaaafireahydrantaisaoperated,aitashouldabea-
acorrectaanswersa.aJustaopenedaenoughatoahaveaflowa
b.aOpenedafullya
c.aOpenedahalfwaya
d.aRegulatedatoatheaflowarequired
WhichaofatheafollowingaisatheaMOSTacommonafactoraleadingatoatheagenerationaofahydrogenasulf
ideainasewers?a-acorrectaanswersa.aAnaerobicaconditionsa
b.aConstantahighavelocityaofaflowainasewersa
c.aLowaconcentrationsaofaferrousasulfidesa
d.aPresenceaofafats,aoilsaandagrease
EmergencyastoppagesainaseweralinesamayaNOTabeaclearedasafetyabyatheauseaofa-
acorrectaanswersa.aHandarods
b.aHighavelocityaofaflowainasewersa
c.aPoweraroddersa
d.aFireahoses
Youaareatheaoperatoraofaaahighavelocityacleaneraattemptingatoabreakaaastoppage.aTheadistanceao
fathealeaderahoseaandanozzleaonayourapressurealineaisa17afeet.aYouasetatheafootageacounteratoare
ada"zero"aasathealeaderahoseacouplingaentersatheapipe.aWhenatheacounterareadsa124afeetayouah
itaanaobstructionaandacanagoanoafurther.aApproximatelyahowafaraisaobstructionafromatheamanho
le?a-acorrectaanswersa.a124afeeta
b.a141afeeta
c.a107afeeta
d.a163afeet
Bucketamachineaareabestausedaforathearemovalaofa-acorrectaanswersa.aGreasea
b.aRootsa
c.aDebrisa