WASTEWATER D LICENSE EXAM QUESTIONS AND CORRECT ANSWERS

WASTEWATER D LICENSE EXAM
QUESTIONS AND CORRECT
ANSWERS
HowA2manyA2PPBA2equalsA2oneA2PPM?A2-A2Ans--
OneA2thousandA2partsA2perA2billionA2equalsA2oneA2partA2perA2million

IfA2theA2bubblerA2systemA2airA2supplyA2lineA2atA2theA2wetA2wellA2isA2clogged,A2whatA2willA2t
hisA2causeA2theA2pumpA2toA2do?A2-A2Ans--
PressureA2buildA2upA2inA2theA2supplyA2lineA2wouldA2signalA2moreA2waterA2columnA2thenA2t
hereA2reallyA2was,A2causingA2theA2pumpA2toA2runA2longerA2thanA2necessary,A2possiblyA2no
tA2kickA2offA2andA2runA2continually

IfA2theA2bubblerA2systemA2airA2supplyA2lineA2atA2theA2wetA2wellA2hasA2aA2holeA2inA2itA2above
A2theA2waterA2level,A2whatA2willA2thisA2causeA2theA2pumpA2toA2do?A2-A2Ans--
ItA2wouldA2causeA2aA2lowA2pressureA2readingA2showingA2aA2lowerA2waterA2levelA2thenA2the
reA2reallyA2is,A2orA2possibleA2notA2evenA2kickingA2onA2theA2pump

WhatA2isA2theA2bestA2wayA2toA2keepA2withinA2theA2operatingA2budget?A2-A2Ans--
keepA2listA2ofA2purchasesA2andA2expensesA2toA2dateA2duringA2fiscalA2year

comparisonsA2shouldA2beA2madeA2withA2budgetA2allocationsA2toA2avoidA2excessA2purchas
es

reviewA2purchasesA2monthlyA2andA2compareA2toA2budget

IfA2aA2diaphragmA2pumpA2hasA22A2checkA2valvesA2open,A2whatA2willA2theA2pumpA2do?A2-
A2Ans--
ItA2wouldA2notA2pumpA2properlyA2becauseA21A2checkA2valveA2shouldA2beA2shutA2whileA2the
A2otherA2isA2open


AA2suctionA2liftA2pumpA2onA2theA2inletA2sideA2normallyA2readsA22inA2ofA2mercuryA2onA2theA2
psiA2vacuumA2gaugeA2butA2notA2readsA23inA2ofA2mercury.A2WhatA2isA2theA2problemA2withA2
theA2pump?A2-A2Ans--
AA2higherA2vacuumA2thanA2normalA2mayA2indicateA2aA2partiallyA2pluggedA2orA2restrictedA2s
uctionA2line.A2

AA2lowerA2vacuumA2mayA2indicateA2aA2higherA2wetA2wellA2levelA2orA2aA2wornA2pumpA2impe
llerA2orA2wearingA2rings.

OneA2mgA2perA2LA2equalsA2howA2manyA2poundsA2perA21A2MG?A2-A2Ans--8.34

,WhatA2isA2theA2properA2wayA2toA2putA2packingA2inA2aA2pump?A2-A2Ans--
cutA2theA2packingA2ropeA2aboutA245A2degreeA2angle,A2placeA2aroundA2shaft,A2beA2sureA2to
A2offset/staggerA2theA2nextA2jointA2fromA2theA2previous


HowA2manyA2dripsA2ofA2waterA2shouldA2youA2haveA2comingA2outA2ofA2aA2packingA2seal?A2-
A2Ans--noA2dripA2onA2aA2mechanicalA2seal


HowA2manyA2dripsA2ofA2waterA2shouldA2youA2haveA2comingA2outA2ofA2aA2packingA2seal?
A22A2-A2Ans--whatA2theA2operationA2andA2maintenanceA2manualA2recommends


AA2oneA2horsepowerA2motorA2thatA2runsA2onA2110A2voltsA2usingA210A2ampsA2hasA2whatA2e
fficiency?A2-A2Ans--mostA2motorsA2runA2fromA280-95%A2efficiency

AA2motorA2thatA2hasA2440A2voltA2supplyA2isA2usuallyA2whatA2phaseA2ofA2power?A2-A2Ans--
3A2phase

NPDESA2-A2Ans--NationalA2PollutantA2DischargeA2EliminationA2System

theA2regulatoryA2agencyA2documentA2issuedA2byA2eitherA2aA2federalA2orA2stateA2agencyA2
whichA2isA2designedA2toA2controlA2allA2dischargesA2ofA2pollutantsA2fromA2pointA2sourcesA2i
ntoA2USA2waterwaysA2-A2Ans--NPDESA2permit

WhatA2isA2theA2nameA2ofA2ourA2operatingA2permit?A2-A2Ans--NPDES

WhatA2isA2theA2bestA2wayA2toA2promoteA2safetyA2inA2theA2workplace?A2-A2Ans--
theA2supervisorA2needsA2toA2beA2safeA2andA2promoteA2safetyA2inA2suchA2aA2mannerA2toA2g
etA2theA2employeesA2involved

WhatA2isA2normallyA2usedA2toA2raiseA2theA2pHA2inA2sludge?A2-A2Ans--lime

WhatA2isA2theA2commonA2deviceA2usedA2toA2measureA2theA2effluentA2ofA2aA2lagoon?A2-
A2Ans--vA2notchA2weir


WhatA2concentrationA2ofA2H2SA2isA2unsafeA2toA2humans?A2-A2Ans--
deathA2inA2aA2fewA2minutesA2atA20.2%.A2ParalyzesA2respiratoryA2center

WhatA2isA2theA2minimumA2O2A2concentrationA2thatA2isA2safeA2forA2workersA2toA2enterA2aA2
manhole?A2-A2Ans--
IfA2O2A2isA2lessA2thanA219.5%,A2doA2notA2enterA2spaceA2withoutA2respiratoryA2protection.A2
NormalA2airA2containsA220.93%A2ofA2O2.

NormalA2airA2containsA2______%A2ofA2O2A2-A2Ans--19.5%

WhatA2knobA2isA2turnedA2toA2controlA2theA2usageA2ofA2chlorineA2applied?A2-A2Ans--
rotameter

, CanA2youA2storeA2BODA2atA24CA2forA248A2hours?A2-A2Ans--yes

WhatA2isA2theA2minimumA2velocityA2ofA2theA2waterA2flowA2forA2aA2gritA2chamberA2andA2theA
2maximumA2flow?A2-A2Ans--1.0A2feetA2perA2secondA2minimum
1.5A2feetA2perA2secondA2optimum
2.0A2feetA2perA2secondA2maximum

HowA2manyA2mg/LA2equalsA2oneA2grainA2perA2gallon?A2-A2Ans--17.1A2mg/L

DissolvedA2oxygenA2increasesA2whenA2theA2temperatureA2__________A2-A2Ans--
decreases

YouA2canA2tellA2ifA2aA2clarifierA2scraperA2armA2isA2workingA2byA2whatA2means?A2-A2Ans--
theA2simplestA2isA2toA2visualA2checkA2toA2seeA2ifA2theA2scumA2scraperA2armA2isA2movingA2p
roperlyA2

checkA2intoA2foam

IfA2theA2sludgeA2isA2thickA2orA2thin,A2thenA2whatA2doesA2thisA2tellA2youA2aboutA2theA2sludge
A2scraper?A2-A2Ans--
possibleA2answerA2isA2theA2flightsA2areA2damagedA2orA2theA2speedA2ofA2theA2scrapers(flig
hts)A2needA2toA2beA2increasedA2ifA2sludgeA2isA2tooA2thick

orA2slowedA2downA2ifA2theA2sludgeA2isA2tooA2thin

agingA2andA2maturingA2ofA2aA2bodyA2ofA2waterA2-A2Ans--eutrophication

eutrophicationA2-A2Ans--agingA2andA2maturingA2ofA2aA2bodyA2ofA2water

IfA2theA2effluentA2fromA2aA2treatmentA2facilityA2containedA25mg/
LA2ofA2BOD,A2whatA2effectA2wouldA2thisA2haveA2onA2theA2receivingA2stream?A2-A2Ans--
littleA2effect

IfA2youA2areA2doingA2aA2testA2andA2addA2oneA2dropA2ofA2chemicalA2atA2aA2time,A2whatA2isA2t
hisA2methodA2called?A2-A2Ans--titration

IfA2doingA2aA2winklerA2orA2azideA2methodA2afterA2addingA2theA2firstA22A2chemicalsA2andA2th
eA2contentsA2ofA2theA2bottleA2turnA2white,A2whatA2doesA2thisA2mean?A2-A2Ans--
noA2oxygenA2leftA2inA2bottle,A2itA2hasA2allA2beenA2consumed

HowA2farA2fromA2aA2wellA2shouldA2aA2sewerA2mainA2be?A2-A2Ans--300A2feet

aA2connectionA2betweenA2aA2potableA2waterA2systemA2andA2aA2nonpotableA2waterA2supply
A2-A2Ans--crossA2connection


aA2diseaseA2causingA2bacteriaA2-A2Ans--pathogenic