Q-01 FDNY QUESTIONS WITH COMPLETE SOLUTIONS

Q-01 FDNY QUESTIONS WITH
COMPLETE SOLUTIONS
Ruptureamembers,awhenausedainaparallelawithaaareliefavalve,aareanotatoaexceeda_____%aa
boveadesignedaworkingapressurea-aans✔✔20%

Butterflyavalve:awhereacanaitabeaused?a-
aans✔✔Canabeausedaonatheainletaandaoutletaofaaawaterapump



Whataelectricalamotoraprotectionadeviceaautomaticallyaresetsaitself?a-
aans✔✔Theathermalaprotector



746awattsaequalsahowamanyakilowattahours?a-aans✔✔.746akilowattahours

Whatapositionaisathealiquidalineaserviceavalveanormallyain?a-aans✔✔Back-seated

Inaanaoperatingaevaporator,aoilastaysaonatopaofawhicharefrigerant?a-
aans✔✔Carbonadioxide,aR-744



Atawhatapressureadoesatheareliefavalveablowaonaaahighapressureamachine?a-
aans✔✔300apsi



Whatawouldaindicateaaarestrictiona(suchaasadirtaorascale)ainathealiquidaline?a-
aans✔✔Frostaimmediatelyaafterathearestriction



Whatadoesasolubilityamean?a-
aans✔✔Theaabilityaofaaarefrigerantatoamixawithaotherasubstances



ChargingaVapora—Inaaacompressionasystem,awhereadoayouachargeatheavapor?a-
aans✔✔SuctionasideaofatheacompressoraatatheaSuctionaServiceaValve



WhenacomparingaaabrineawithasaPHaofa8atoaoneawithaaaPHaofa10,aitsaalkalinityais:a-
aans✔✔100atimesagreatera(ex.aPHa8atoaPHa9aisa10atimesagreater)



Inaanaefficientlyaoperatingainducedadraftacoolingatower,athealeavingawateraisabetween:a-
aans✔✔Dryabulbaandawetabulbatemperature



Toaproduceatheadesiredaevaporatoratemperature,atheapowerainputaisareducedabyakeepinga
headapressure...a-
aans✔✔Headapressureaasalowaasapossiblea&asuctionapressureaasahighaasaneeded

,Theaaccumulatoraisausuallyabetweenathe...a-aans✔✔Compressoraandaevaporator

Anaoilingasystemainaaalargeacentrifugalasystemashouldaconsistaofaataleast...a-
aans✔✔Reservoir,apumpaandadistributionalines



Inaanaevaporatorathatachillsabrine,atheagreatestacoolingaeffectaonatheabrinearesultsafromathe
...a-aans✔✔Boilingaofalowapressurealiquid

Theaflowaofaweakaliquoratoatheaabsorberaisacontrolledaby
A)agasapressure
B)athrottlingadevice
C)afloatavalve
D)apressureaofatheastrongaliquorapumpa-aans✔✔B)athrottlingadevice

Theabestawayaofadetectingaammoniaabrineaisabyausing
A)aCO2agas
B)apotassiumaofalime
C)aNesslerareagent
D)acarbonateaofasodaa-aans✔✔C)aNesslerareagent

Theabestatimeatoapurgeaanaammoniaaplantawitha250albs.aofaammoniaais
A)aduringashut-down,abecauseayouawillaloseaammonia
B)awhileachargingatheaplant
C)aduringaoperation
D)anoneaofatheaabovea-aans✔✔C)aduringaoperation

Whatawillamakeatheastrongaliquorainatheaabsorberadecrease?
A)aexpansionavalveaopenatooamuch
B)aAadecreaseainaevaporatoraload
C)aAnaincreaseainaevaporatoraload
D)aTooamuchasteamaonatheageneratora-aans✔✔B)aAadecreaseainaevaporatoraload

Whichaofatheafollowingastatementsaisaincorrect?
A)aAaserviceavalveaisaaakey-operatedashut-
offavalveausedaduringashipment,ainstallationaandarepairs
B)aBrineaisaaaliquidacooledabyarefrigerationaandausedaforatheatransmissionaofaheat
C)aAafusibleaplugahasaaaset-temperatureafusibleamemberatoarelieveapressure
D)aAaruptureamemberaautomaticallyarupturesaataaapredeterminedatemperaturea-
aans✔✔D)aAaruptureamemberaautomaticallyarupturesaataaapredeterminedatemperature



Oilainaaarefrigerantashould
A)ahaveaaahighapourapoint
B)ahaveaaalowaflashapoint
C)ahaveaaahighaviscosity

, D)anotacontainamoisturea-aans✔✔D)anotacontainamoisture

InaanaNH3adryaexpansionaevaporatorawithaTXVaandabulbaclampedaproperlyaonatheaoutleta
ofatheaevaporator,atheasuperheatais
A)a7atoa10°aF
B)a5atoa9°aF
C)a20atoa30°aF
D)a1atoa2°aFa-aans✔✔A)a7atoa10°aF

Theasettingaofaaafusibleaplugais
A)a280°aF
B)a300°aF
C)a380°aF
D)a300apsig.a-aans✔✔A)a280°aF

Ifatheainsulationawasaremovedafromatheabulbaofatheaexpansionavalve,awhatawouldahappen
?a-aans✔✔Floodedaevaporatora—
theaTXVabulbaopensainaaarangeafroma45atoa85°aF.aIfatheainsulationawasaremoved,atheabulba
wouldasenseatheatemperatureainatheamachinearoomaandakeepatheaTXVaopen,athusafloodin
gatheaevaporator.

Onatheamostacommonathree-phase,afour-
wireaservice,atheavoltageabetweenaanyaphaseaandaneutralashouldabe
A)a105avolts
B)a120avolts
C)a208avolts
D)a220avoltsa-aans✔✔B)a120avolts

Aarefrigerantaoverchargeawould
A)aincreaseaheadapressure
B)adecreaseaheadapressure
C)adecreaseasolution-sideapressure
D)adecreaseadischarge-sideapressurea-aans✔✔A)aincreaseaheadapressure

AadryeraisagenerallyainstalledawithaotheraequipmentainaaacommercialaFreonacompressoras
ystem.aThearecommendedalocationaofathisadryeraisaonathe
A)ahigh-pressurealineabetweenacondenseraandareciever
B)asuctionalineabetweenaevaporatoraandacompressor
C)adischargealineabetweenacompressoraandacondenser
D)aliquidalineabetweenareceiveraandaexpansionavalvea-
aans✔✔D)aliquidalineabetweenareceiveraandaexpansionavalve



R-22a—Whatadoesaitasmellalike?a-aans✔✔Odorless

Desirableacharacteristicsaofaaarefrigerant: