WATER DISTRIBUTION PRACTICE EXAM
2 (D1-D2) QUESTIONS WITH CORRECT
ANSWERS 2025
WhichRprocessRconvertsRammoniaRtoRnitriteRandRnitrate?R-RCORRECTRANSWERR-Nitrification
WhatRisRtheRmaximumRadvisableRrateRofRchlorineRgasRremovalRfromRaR150-RpoundRcylinder?R-
RCORRECTRANSWERR-40RpoundsRperRday
WhatRisRaRtypeRofRpositiveRdisplacementRwaterRmeter?R-RCORRECTRANSWERR-Nutating-RdiskRmeter
WhatRisRaRpower-operatedRmechanismRforRopeningRandRclosingRaRvalve?R-RCORRECTRANSWERR-Actuator
WhatRisRrequiredRifRaRroutineRsampleRtestRpositiveRforRtotalRcoliformRbacteria?R-RCORRECTRANSWERR-
TakeRrepeatRsamples
WhyRisRaRgridRlayoutRbetterRthanRaRtreeRlayoutRforRaRwaterRdistributionRsystem?R-RCORRECTRANSWERR-
LessRdead-endRmains
WhatRisRtheRpurposeRofRaRreducedRpressureRprincipleRassembly?R-RCORRECTRANSWERR-PreventsRback-
pressureRandRback-siphonage
InRgeneral,RatRwhatRdepthsRisRshoringRrequiredRforRaRtrench,RifRyou'reRexcavatingRinRsoil?R-
RCORRECTRANSWERR-5RfeetRorRdeeper
WhatRoccursRafterRbreakpointRchlorinationRisRachieved?R-RCORRECTRANSWERR-
FreeRavailableRchlorineRresidualRisRdirectlyRproportionalRtoRtheRamountRofRchlorineRadded
WhatRisRusedRtoRautomaticallyRshut-offRtheRflowRintoRaRtankRwhenRtheRwaterRlevelRreachesRaRpre-
determinedRlevel?R-RCORRECTRANSWERR-AltitudeRvalve
, WhatRwouldRbeRusedRtoRfindRaRchlorineRgasRleak,RwhichRproducesRwhiteRsmokeRwhenRitRreactsRwithRthisRsu
bstance?R-RCORRECTRANSWERR-SprayRammoniaRsolutionRvaporRnearRleak
WhatRcausesRstainingRofRplumbingRfixtures?R-RCORRECTRANSWERR-IronR&Rmanganese
HowRlongRshouldRyouRflushRwaterRbeforeRyouRcollectRaRbacteriologicalRsample?R-RCORRECTRANSWERR-
AsRlongRasRnecessaryRtoRflushRstagnantRwaterRfromRtheRserviceRpipe
WhatRisRtheRpurposeRofRaRsurgeRtank?R-RCORRECTRANSWERR-ProtectRpipelinesRfromRsuddenRhighRpressure
WhatRisRrecommendedRifRaRchlorineRgasRcylinderRisRleaking?R-RCORRECTRANSWERR-
RotateRtheRcylinderRandRturnRtheRleakRupwards
WhatRisRtheRpurposeRofRprimaryRMCL?R-RCORRECTRANSWERR-ToRprotectRhumanRhealth
WhatRproblemRcouldRbeRusedRbyRwaterRwithRaRpHRofR5.3?R-RCORRECTRANSWERR-Corrosión
WhatRisRaRcommonRwayRtoRconnectRaRnewRpipeRtoRanRexistingRpipe,RwhileRtheRlatterRisRpressurizedRandRin-
service?R-RCORRECTRANSWERR-WetRtapRorRhotRtap
WhatRimpactRwouldRorganicsRhaveRonRchlorineRdemand?R-RCORRECTRANSWERR-IncreaseRchlorineRdemand
WhatRisRdichloramine?R-RCORRECTRANSWERR-CombinedRchlorineRresidual
WhatRimpactRdoesRtuberculationRhaveRonRtheRinteriorRofRaRwaterRmain?R-RCORRECTRANSWERR-
CausesRroughRinteriorRofRtheRwaterRdueRtoRcorrosion
WhatRisRusedRtoRneutralizeRchlorineRresidualsRwhenRcollectingRaRwaterRsampleRforRbacteriologicalRanalysis
?R-RCORRECTRANSWERR-SodiumRthiosulfate
WhatRareRelectrodesRandRultrasonicRsignalsRusedRforRinRaRtank?R-RCORRECTRANSWERR-MonitorRwaterRlevel
2 (D1-D2) QUESTIONS WITH CORRECT
ANSWERS 2025
WhichRprocessRconvertsRammoniaRtoRnitriteRandRnitrate?R-RCORRECTRANSWERR-Nitrification
WhatRisRtheRmaximumRadvisableRrateRofRchlorineRgasRremovalRfromRaR150-RpoundRcylinder?R-
RCORRECTRANSWERR-40RpoundsRperRday
WhatRisRaRtypeRofRpositiveRdisplacementRwaterRmeter?R-RCORRECTRANSWERR-Nutating-RdiskRmeter
WhatRisRaRpower-operatedRmechanismRforRopeningRandRclosingRaRvalve?R-RCORRECTRANSWERR-Actuator
WhatRisRrequiredRifRaRroutineRsampleRtestRpositiveRforRtotalRcoliformRbacteria?R-RCORRECTRANSWERR-
TakeRrepeatRsamples
WhyRisRaRgridRlayoutRbetterRthanRaRtreeRlayoutRforRaRwaterRdistributionRsystem?R-RCORRECTRANSWERR-
LessRdead-endRmains
WhatRisRtheRpurposeRofRaRreducedRpressureRprincipleRassembly?R-RCORRECTRANSWERR-PreventsRback-
pressureRandRback-siphonage
InRgeneral,RatRwhatRdepthsRisRshoringRrequiredRforRaRtrench,RifRyou'reRexcavatingRinRsoil?R-
RCORRECTRANSWERR-5RfeetRorRdeeper
WhatRoccursRafterRbreakpointRchlorinationRisRachieved?R-RCORRECTRANSWERR-
FreeRavailableRchlorineRresidualRisRdirectlyRproportionalRtoRtheRamountRofRchlorineRadded
WhatRisRusedRtoRautomaticallyRshut-offRtheRflowRintoRaRtankRwhenRtheRwaterRlevelRreachesRaRpre-
determinedRlevel?R-RCORRECTRANSWERR-AltitudeRvalve
, WhatRwouldRbeRusedRtoRfindRaRchlorineRgasRleak,RwhichRproducesRwhiteRsmokeRwhenRitRreactsRwithRthisRsu
bstance?R-RCORRECTRANSWERR-SprayRammoniaRsolutionRvaporRnearRleak
WhatRcausesRstainingRofRplumbingRfixtures?R-RCORRECTRANSWERR-IronR&Rmanganese
HowRlongRshouldRyouRflushRwaterRbeforeRyouRcollectRaRbacteriologicalRsample?R-RCORRECTRANSWERR-
AsRlongRasRnecessaryRtoRflushRstagnantRwaterRfromRtheRserviceRpipe
WhatRisRtheRpurposeRofRaRsurgeRtank?R-RCORRECTRANSWERR-ProtectRpipelinesRfromRsuddenRhighRpressure
WhatRisRrecommendedRifRaRchlorineRgasRcylinderRisRleaking?R-RCORRECTRANSWERR-
RotateRtheRcylinderRandRturnRtheRleakRupwards
WhatRisRtheRpurposeRofRprimaryRMCL?R-RCORRECTRANSWERR-ToRprotectRhumanRhealth
WhatRproblemRcouldRbeRusedRbyRwaterRwithRaRpHRofR5.3?R-RCORRECTRANSWERR-Corrosión
WhatRisRaRcommonRwayRtoRconnectRaRnewRpipeRtoRanRexistingRpipe,RwhileRtheRlatterRisRpressurizedRandRin-
service?R-RCORRECTRANSWERR-WetRtapRorRhotRtap
WhatRimpactRwouldRorganicsRhaveRonRchlorineRdemand?R-RCORRECTRANSWERR-IncreaseRchlorineRdemand
WhatRisRdichloramine?R-RCORRECTRANSWERR-CombinedRchlorineRresidual
WhatRimpactRdoesRtuberculationRhaveRonRtheRinteriorRofRaRwaterRmain?R-RCORRECTRANSWERR-
CausesRroughRinteriorRofRtheRwaterRdueRtoRcorrosion
WhatRisRusedRtoRneutralizeRchlorineRresidualsRwhenRcollectingRaRwaterRsampleRforRbacteriologicalRanalysis
?R-RCORRECTRANSWERR-SodiumRthiosulfate
WhatRareRelectrodesRandRultrasonicRsignalsRusedRforRinRaRtank?R-RCORRECTRANSWERR-MonitorRwaterRlevel