CWEA COLLECTIONS SYSTEM
MAINTENANCE GRADE 3
QUESTIONS WITH CORRECT
ANSWERS 2025/2026
AaFlaggerashouldaStand?
A.aOnatheashoulderaadjacentatoatrafficabeingacontrolled
B.aInatheaclosedalaneabeforeastoppingavehicleatraffic
C.aInatheatrafficalane.
D.aAsastatedaina"A"aora"B"aabove.a-acorrectaanswersD.aAsastatedaina"A"aora"B"aabove.
Legallyaresponsibleaofficialsaarearequiredatoareportacategorya1asanitaryaseweraoverflows?
A.aWithina30adays
B.aBeforeaendaofatheaday
C.aAsasoonaasapossible
D.aWithina2ahoursa-acorrectaanswersD.aWithina2ahours
Whenaworkingainaconfinedaspacesaorasewers,awhataformaofalightingawouldayouause?
A.aMirrorsatoadirectatheasunlightaoraexplosionaproofalighting.
B.aOrdinaryaelectricalights
C.aPropane,aGas,aorakerosenealanterns
D.aSpecialamatchesa-
acorrectaanswersA.aMirrorsatoadirectatheasunlightaoraexplosionaproofalighting.
Whatacanahappenaifawater-basedasubstancesaareausedatoaextinguishaelectricalafires?
a.aNothingabutaextinguishatheafirea
b.aTheafumesaareanotaharmfula
c.aReceiveaanaelectricalashocka
d.aTheyawillacorrodeatheaelectricalacontactsa-acorrectaanswersc.aReceiveaanaelectricalashock
Whenatestingaaamanholeaforaexplosiveagasesawhenashouldatheafirstatestsabeamade?
a.aAfteraremovingatheamanholeacovera
b.aBeforearemovingatheamanholeacovera
,c.aAtaanyatimea
d.aAfteraventilationa-acorrectaanswersb.aBeforearemovingatheamanholeacover
Atmosphericahazardsaencounteredainamanholesacanainclude:
a.anon-explosiveaatmospheres.a
b.anon-toxicaatmosphere.a
c.alackaofaoxygen.a
d.anon-flammableaatmospheres.a-acorrectaanswersc.alackaofaoxygen.
Whenasettingaupatoaventilateaaamanhole,atheaairainletashouldabeahowamanyafeetaaboveastreetale
vel?
a.a4.0a
b.a3.0a
c.a2.0a
d.a1.0a-acorrectaanswersc.a2.0
Whichachemicalamayabeausedaforaodoracontrolainaaasewerasystem?
a.aCalciumachloridea
b.aHydrogenaperoxidea
c.aOxidizedaaluminuma
d.aSodiumachloridea-acorrectaanswersb.aHydrogenaperoxide
Whatainformationamustabeaonaaawarningatagaattachedatoaaaswitchathatahasabeenalockedaout?
a.aDirectionsaforaremovingatag.a
b.aNameaofanearestaphysicianatoacallainacaseaofaemergency.a
c.aSignatureaofapersonawhoalockedaoutaswitchaandawhoaisatheaonlyapersonaauthorizedatoaremov
eatag.a
d.aTimeatoaunlockaswitch.a-
acorrectaanswersc.aSignatureaofapersonawhoalockedaoutaswitchaandawhoaisatheaonlyapersonaauth
orizedatoaremoveatag.
Underawhataconditionsamustaeachamemberaofathearescueaserviceapracticeapermitaspacearescue
s?
a.aAtaleastaonceaaayearainaaasimulatedasituationaorabyatheasatisfactoryaperformanceaofaanaactuala
rescue.a
, b.aAtaleastatwiceaaayearainasimulatedasituations.
c.aAtaleastaonceaaayearainasimulatedasituationausinganon-representativeaspaceaconditionsa
a
d.aAtaleastafouratimesaaayear.a-
acorrectaanswersa.aAtaleastaonceaaayearainaaasimulatedasituationaorabyatheasatisfactoryaperforma
nceaofaanaactualarescue.
Howaisaaapermit-requiredaspaceadescribed?
a.aHasaoramayacontainaatmospheric,aengulfment,adesign,aoraotheraseriousahealth/safetyahazard
.
b.aIsalargeaenoughatoaenteraandaworkainaandaisameantaforacontinuousaoccupancy.a
c.aIsalargeaenoughatoaenteraandaworkainaandahasaanaunrestrictedaentry/exit.a
d.aNeveracontainsaanaatmosphericaoraengulfmentahazard.a-
acorrectaanswersa.aHasaoramayacontainaatmospheric,aengulfment,adesign,aoraotheraseriousaheal
th/safetyahazard.
WhataareatheathreeadutiesaofapersonnelainaaaConfinedaSpaceaentry?
a.aAuthorizedaentrants,aparkingaattendants,aentryasupervisors.a
b.aUnauthorizedaentrants,aattendants,aentryasupervisors.a
c.aAuthorizedaentrants,aattendants,aentryasupervisors.a
d.aAuthorizedaentrants,aattendants,aeveningasupervisorsa-
acorrectaanswersc.aAuthorizedaentrants,aattendants,aentryasupervisors.
Whataisaanaimportantaelementaofahydrogenasulfideaproduction?
a.aFlowavelocity.a
b.aPipeamaterials.a
c.aAmountaofaodorapresent.a
d.aAmountaofainorganicamaterials.a-acorrectaanswersa.aFlowavelocity.
Whichaofatheafollowingaisatheamostacommonafactoraleadingatoatheagenerationaofahydrogenasulfi
deainasewers?
a.aAnaerobicaconditions.a
b.aConstantlyahighavelocityaofaflowainasewers.a
c.aLowaconcentrationsaofaferrousasulfide.a
d.aPresenceaofahighlyasolubleafatsaandaoils.a-acorrectaanswersa.aAnaerobicaconditions.
MAINTENANCE GRADE 3
QUESTIONS WITH CORRECT
ANSWERS 2025/2026
AaFlaggerashouldaStand?
A.aOnatheashoulderaadjacentatoatrafficabeingacontrolled
B.aInatheaclosedalaneabeforeastoppingavehicleatraffic
C.aInatheatrafficalane.
D.aAsastatedaina"A"aora"B"aabove.a-acorrectaanswersD.aAsastatedaina"A"aora"B"aabove.
Legallyaresponsibleaofficialsaarearequiredatoareportacategorya1asanitaryaseweraoverflows?
A.aWithina30adays
B.aBeforeaendaofatheaday
C.aAsasoonaasapossible
D.aWithina2ahoursa-acorrectaanswersD.aWithina2ahours
Whenaworkingainaconfinedaspacesaorasewers,awhataformaofalightingawouldayouause?
A.aMirrorsatoadirectatheasunlightaoraexplosionaproofalighting.
B.aOrdinaryaelectricalights
C.aPropane,aGas,aorakerosenealanterns
D.aSpecialamatchesa-
acorrectaanswersA.aMirrorsatoadirectatheasunlightaoraexplosionaproofalighting.
Whatacanahappenaifawater-basedasubstancesaareausedatoaextinguishaelectricalafires?
a.aNothingabutaextinguishatheafirea
b.aTheafumesaareanotaharmfula
c.aReceiveaanaelectricalashocka
d.aTheyawillacorrodeatheaelectricalacontactsa-acorrectaanswersc.aReceiveaanaelectricalashock
Whenatestingaaamanholeaforaexplosiveagasesawhenashouldatheafirstatestsabeamade?
a.aAfteraremovingatheamanholeacovera
b.aBeforearemovingatheamanholeacovera
,c.aAtaanyatimea
d.aAfteraventilationa-acorrectaanswersb.aBeforearemovingatheamanholeacover
Atmosphericahazardsaencounteredainamanholesacanainclude:
a.anon-explosiveaatmospheres.a
b.anon-toxicaatmosphere.a
c.alackaofaoxygen.a
d.anon-flammableaatmospheres.a-acorrectaanswersc.alackaofaoxygen.
Whenasettingaupatoaventilateaaamanhole,atheaairainletashouldabeahowamanyafeetaaboveastreetale
vel?
a.a4.0a
b.a3.0a
c.a2.0a
d.a1.0a-acorrectaanswersc.a2.0
Whichachemicalamayabeausedaforaodoracontrolainaaasewerasystem?
a.aCalciumachloridea
b.aHydrogenaperoxidea
c.aOxidizedaaluminuma
d.aSodiumachloridea-acorrectaanswersb.aHydrogenaperoxide
Whatainformationamustabeaonaaawarningatagaattachedatoaaaswitchathatahasabeenalockedaout?
a.aDirectionsaforaremovingatag.a
b.aNameaofanearestaphysicianatoacallainacaseaofaemergency.a
c.aSignatureaofapersonawhoalockedaoutaswitchaandawhoaisatheaonlyapersonaauthorizedatoaremov
eatag.a
d.aTimeatoaunlockaswitch.a-
acorrectaanswersc.aSignatureaofapersonawhoalockedaoutaswitchaandawhoaisatheaonlyapersonaauth
orizedatoaremoveatag.
Underawhataconditionsamustaeachamemberaofathearescueaserviceapracticeapermitaspacearescue
s?
a.aAtaleastaonceaaayearainaaasimulatedasituationaorabyatheasatisfactoryaperformanceaofaanaactuala
rescue.a
, b.aAtaleastatwiceaaayearainasimulatedasituations.
c.aAtaleastaonceaaayearainasimulatedasituationausinganon-representativeaspaceaconditionsa
a
d.aAtaleastafouratimesaaayear.a-
acorrectaanswersa.aAtaleastaonceaaayearainaaasimulatedasituationaorabyatheasatisfactoryaperforma
nceaofaanaactualarescue.
Howaisaaapermit-requiredaspaceadescribed?
a.aHasaoramayacontainaatmospheric,aengulfment,adesign,aoraotheraseriousahealth/safetyahazard
.
b.aIsalargeaenoughatoaenteraandaworkainaandaisameantaforacontinuousaoccupancy.a
c.aIsalargeaenoughatoaenteraandaworkainaandahasaanaunrestrictedaentry/exit.a
d.aNeveracontainsaanaatmosphericaoraengulfmentahazard.a-
acorrectaanswersa.aHasaoramayacontainaatmospheric,aengulfment,adesign,aoraotheraseriousaheal
th/safetyahazard.
WhataareatheathreeadutiesaofapersonnelainaaaConfinedaSpaceaentry?
a.aAuthorizedaentrants,aparkingaattendants,aentryasupervisors.a
b.aUnauthorizedaentrants,aattendants,aentryasupervisors.a
c.aAuthorizedaentrants,aattendants,aentryasupervisors.a
d.aAuthorizedaentrants,aattendants,aeveningasupervisorsa-
acorrectaanswersc.aAuthorizedaentrants,aattendants,aentryasupervisors.
Whataisaanaimportantaelementaofahydrogenasulfideaproduction?
a.aFlowavelocity.a
b.aPipeamaterials.a
c.aAmountaofaodorapresent.a
d.aAmountaofainorganicamaterials.a-acorrectaanswersa.aFlowavelocity.
Whichaofatheafollowingaisatheamostacommonafactoraleadingatoatheagenerationaofahydrogenasulfi
deainasewers?
a.aAnaerobicaconditions.a
b.aConstantlyahighavelocityaofaflowainasewers.a
c.aLowaconcentrationsaofaferrousasulfide.a
d.aPresenceaofahighlyasolubleafatsaandaoils.a-acorrectaanswersa.aAnaerobicaconditions.
