D2 EXAM QUESTIONS

D2 EXAM QUESTIONS


Thebnonlybnabsolutelybnreliablebnmethodbnofbnbackflowbnpreventionbnisbnthebnusebnofbn-bnanswers--
anbnairbngap



Thebnbubblesbnformedbninbnabnpositivebnmultiplebntubebnfermentationbntestbnare?bn-bnanswers--
carbonbndioxide



Thebnmaximumbnratebnofbnwithdrawalbnofbngasbnfrombnabn150bnpoundbnchlorinebncylinderbninbn24bnho
ursbnis?bn-bnanswers--40bnpounds



Ifbnyoubneverbnencounterbnabnliquidbnchlorinebnleakbninbnabnonebntonbncontainerbnwhichbnactionbnshoul
dbnyoubntakebnfirstbntobnreducebnthebnseveritybnofbnthebnleak?bn-bnanswers--
Rotatebnthebncontainerbntobnplacebnthebnleakbnatbnthebntop



ThebnmostbncommonlybnusedbnwaterbndisinfectantbninbnthebnUnitedbnStatesbnis?bn-bnanswers--Chlorine



Whenbncollectingbnabndistributionbnsystembnsamplebnthebnwaterbnshouldbnbebnallowedbntobnrunbnforbna
bnperiodbnofbntimebnpriorbntobnsamplebncollection.bnThisbnperiodbnofbntimebnis?bn-bnanswers--
Asbnlongbnasbnnecessarybntobnpermitbnclearingbnofbnthebnservicebnline



Samplebnbottlesbnwhichbnarebnfurnishedbnbybnabncertifiedbnlaboratorybnforbncollectionbnofbnbacteriologi
calbnsame?



a.bnShouldbnbebnrinsedbnwithbnthebnwaterbntobnbebnsampledbnbeforebnuse

b.bnShouldbnbebnrinsedbnwithbnabnchlorinebnsolutionbnbeforebnuse

c.bnShouldbnbebnrinsedbnwithbndistilledbnwaterbnbeforebnuse

d.bnArebnreadybntobnusebn-bnanswers--Arebnreadybntobnuse

,Thebndifferencebnbetweenbnwaterbnpressuresbnupstreambnandbndownstreambnofbnabnpumpbnwhenbnitbn
isbnnotbninbnoperationbnisbnknownbnasbnthe?bn-bnanswers--Totalbnstaticbnhead



Abndevicebnthatbnautomaticallybnshutsbnoffbnflowbnintobnanbnelevatedbnstoragebntankbnwhenbnwaterbnle
velbninbnthebntankbnreachesbnabnpresetbnlevelbnisbntermedbna?



a.bnAirbn/bnvacuumbnreliefbnvalve

b.bnWet-barrelbnhydrant

c.bnAltitudebnvalve

d.bnAnglebnvalvebn-bnanswers--Altitudebnvalve



Whatbntotalbndosagebnofbnchlorinebnshouldbnbebnappliedbntobnwaterbnthatbnhasbnabnchlorinebndemandb
nofbn1.5bnmg/L,bnwhenbnabnfreebnresidualbnofbn1.0bnmg/Lbnisbndesired?bn-bnanswers--2.5bnmg/L




Inbnanbnoccupiedbntrenchbnrequiringbnpersonnelbnegress,bnwhatbnisbnthebnmaximumbnallowablebndistan
cebnbetweenbnabnworkerbnandbnanbnexitbnladder?bn-bnanswers--25bnfeet



Abnwater-bearingbnformationbninbnthebnsoilbnisbnreferredbntobnasbn-bnanswers--anbnaquifer



Thebndistancebnbetweenbnthebnstaticbnwaterbnlevelbnandbnthebnpumpingbnwaterbnlevelbnisbntermedbnth
e?bn-bnanswers--Drawdown



Tobnpreventbnthebnentrybnofbnsurfacebncontaminationbnintobnabnwellbnisbnthebnpurposebnof?bn-
bnanswers--Thebnsanitarybnseal




Thebnpresencebnofbncoliformbnbacteriabninbnabndistributionbnsystembn-bnanswers--
Indicatesbnpathogensbnmaybnbebnpresent



Thebnmostbncommonbnvalvebntypebninbnwaterbndistributionbnsystemsbnisbnthe?bn-bnanswers--
Gatebnvalve

, ThebnVenturibnisbnabndevicebnto?bn-bnanswers--Measurebnwaterbnflow



Backspinbnisbnoccurringbnafterbnwellbnshutdown;bnthisbnindicatesbn-bnanswers--Abnfaultybncheckbnvalve



AbnpHbnreadingbnofbn6.0bnunitsbnindicatesbnthatbnthebnwaterbnsamplebnis:



a.bnVerybnacidic

b.bnSlightlybnalkaline

c.bnVerybnalkaline

d.bnSlightlybnacidicbn-bnanswers--Slightlybnacidic



Chlorinebngasbnisbnheavierbnthanbnair.bnTruebnorbnfalsebn-bnanswers--True



Thebnchangebninbnwaterbndemandbnduringbnthebncoursebnofbnabndaybnisbntermedbn-bnanswers--
diurnalbnvariation



Cathodicbnprotectionbnisbnabnsystembnusedbnforbn-bnanswers--metallicbncorrosionbninhibition



Thebnelevationbnofbnthebnfreebnsurfacebninbnabnwaterbntablebnwellbnwhichbnisbnnotbnrunningbnisbnterme
dbn-bnanswers--Staticbnwaterbnlevel



Thebnmaximumbnmomentarybnloadbnplacedbnonbnabnwaterbnsupplybnsystembnisbnknownbnas?bn-
bnanswers--peakbndemand




Mostbnbelow-ground-levelbnstoragebntanksbnarebnconstructedbnof?



a.bnFiberglass

b.bnSteel

c.bnConcrete

d.bnSpecialbncompositebnmaterialsbn-bnanswers--Concrete