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OIT EXAM PREP QUESTIONS AND ANSWERS
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OIT EXAM PREP QUESTIONS AND ANSWERS
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OIT EXAM QUESTIONS AND ANSWERSWhatsarescolloids?s-sans--
✔✔Veryssmallsparticlesssuspendedsinswaterswhichsaresresistantstossettling.
Whatsissturbiditysmeasuredsin?s-sans--✔✔NephelometricsTurbiditysUnitss(NTU)
Whatsissthesturbiditysmeasurementsthatsissvisiblestosthesnakedseye?s-sans--✔✔5sNTU
Whatsissansimportantsindicatorsofstreatmentsefficiencysandsparticularlysthesefficiencysofsfilter
ssandsdisinfectionsprocesses?s-sans--✔✔Turbidity
Whysaresparticlessthatscausesturbiditysharmful?s-sans--
✔✔Theyscanshidesorsentrapsharmfulsorganismsssosthatsthesdisinfectantsissunablestosreachst
hem.sItscallssincreasessCLsdemandswhichscansbescarcinogenic
Whatsaresthes2stypessofssampling?s-sans--✔✔Grabssamplessandscompositessamples
Whatsaresgrabssamplessandswhensissitsused?s-sans--
✔✔Assinglessamplestakensatsonesplacesandstime.sUsedswhenswatersqualitysandsquantitysar
esnotsvariable
Whatsissascompositessamplesandswhensissitsused?s-sans--
✔✔Asseriessofssamplesstakensoversasperiodsofstimeswhichsarescombinedstosformsassinglessa
mple.sNecessarysifswatersqualityschangessgreatlysoverstime.
Whatsissvoltage?s-sans--
✔✔Electricalspotentialsorspotentialsdifferencesbetweenstwospoints.sIndicatedsthesstrengthso
fsthes"push"sonscurrent
Whatsisscurrentsandswhatsaresitssunits?s-sans--
✔✔Flowsoffselectricscharge.sMeasuredsinsamperes
Whatsissthestypicalsratesofschanges(Hz)sorsalternatingscurrent?s-sans--
✔✔60scyclessperssecond
Whatshappensswhenswiressorsappliancesscarrysmoresthanstheirsratedscapacitysofscurrent?s-
sans--✔✔Maysoverheatsandscausesfires.sCircuitsbreakerssstopsthis
,Whatsissthesequationsforsvoltage?s-sans--✔✔V=IR
WhatsissPowers(P),swhatsississmeasuredsinsandswhatsissthesformula?s-sans--
✔✔Thesratesatswhichsworksissdonesorsenergysissproduced.
MeasuredsinsWatts
P=VI
Whatsissthessymbolsforsflowsandswhatsissthesformulasforsit?s-sans--✔✔Flows(Q)
Q=sAV
Whatscansflowsprovidesinfoson?s-sans--
✔✔Dententionstimesinstanks,sflowsbetweensvarioussprocessessorssections,schemicalsfeedsr
ates,setc.
Whatsaresthestypessofsflowsmeasurementsdeterminedsby?s-sans--
✔✔Whetherswatersissflowingsinsasclosedspipesofsansopenschannel
Whatsissusedstosmeasuresflowsinsansopenschannel?s-sans--
✔✔Weirssorsflumes.sFlowsissdeterminedsbysthesheightsofswatersatsasparticularspoint
Whatsissasflume?s-sans--✔✔Asspeciallysshapedsconstrictionsinstheschannel
Whatsissasweir?s-sans--✔✔Asdamsorsobstructionsinstheschannel
Whatsaresventurismeters,sultrasonicsmeters,smagneticsmeters,sdopplersmeterssandsorifices
meterssusedsfor?s-sans--✔✔Measuringsflowsinsclosedspipes.
Whatsissstaticspressure?s-sans--✔✔Thesforcesexertedswhenswatersissatsrestsandsnotsflowing
Whatsissthespressuresexertedsbysflowingswatersknownsas?s-sans--✔✔Dynamicspressure
Whatsissthesforcesexertedswhenswatersissatsrestsandsnotsflowing?s-sans--✔✔Staticspressure
Whatsissthesrisesofswatersinsastubesknownsas?s-sans--✔✔Theshead
Whatsissthespressureslosssduestosfrictionsasswatersflowssthroughsaspipe/filtersetc?s-sans--
✔✔Headloss
Whatsissheadloss?s-sans--
✔✔thespressureslosssduestosfrictionsasswatersflowssthroughsaspipe/filtersetc
Whatscansdecreasesheadsloss?s-sans--✔✔Largersdiametersandssmoothersinteriorssurface
Howscansyousmakesupsforsheadsloss?s-sans--✔✔Energysinputss(pumping)
, Whensdoesswatershammersoccur?s-sans--
✔✔Whensasmovingsfluidssuddenlysstops,scansdestroyspipingsandsappurtenances
Howscansyousavoidswatershammer?s-sans--
✔✔Operatesvalvessslowlysandsstartsandsstopsvalvessgradually
Whatsisscavitationsandshowsdoessitsoccur?s-sans--
✔✔Thesformationsandscollapsesofsasbobblesorsgasspocket.sCansresultsfromsveryslowspressu
reswithinspumpswhichscausesswaterstosboil,sreleasingstinysbubbles.sThesbubblessthenscollap
seswithsenoughsforcestosdamagesthespumpsimpeller
Whatsaresindicationssthatscavitationsissoccurring?s-sans--
✔✔Asvibrationsnoisessimilarstoshammeringsofsthespumpsimpeller
Whatsaresthes2sbasicstypessofspumps?s-sans--✔✔Centrifugalsandsdisplacement
Whatsissascentrifugalspump?s-sans--
✔✔Pressurizesswatersbys"throwingsit"satshighsspeedssfromsthescentresofsthesimpellerstosthes
outside.
Whatsissansimpellersandswhatsdoessitsdo?s-sans--
✔✔Asrotatingsdiskswithsassetsofsvanesscoupledstosthesengine/
motorsshaftsthatsproducesscentrifugalsforceswithinsthespumpscasing.
Whatsissasvolute?s-sans--
✔✔Asspeciallysdesignedschambersthatswidensswithinsthespumpsthatsliquidsacceleratessouts
of
Whatsissthesnamesofstheschambersofsascentrifugalspump?s-sans--✔✔Volute
Whatsissthesnamesofsthesspinnersinsascentrifugalspump?s-sans--✔✔Impeller
Howsarescentrifugalspumpssclassified?s-sans--✔✔Bystheirsshapes
Whatsaresradialsvane,sFrancissvane,smixedsflowsandsaxialsflowsexamplessof?s-sans--
✔✔Centrifugalspumps
Howsdospositivesdisplacementspumpsswork?s-sans--
✔✔Pushsfluidsmechanically.sStartsswithsassuctionsvalvesandsdischargesvalvesopen
Whatsaresscrew,sgear,spiston,sdiaphragm,sandsprogressivescavitysexamplessof?s-sans--
✔✔Positivesdisplacementspumps
Whatsarespackingsglands?s-sans--
✔✔Sealsswhichspreventsthespumpedsfluidsfromsleakingsfromsaspumpsandspreventsairsfromse
ntering
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