制冷原理与设备试题.docx
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制冷原理与设备试题.docx
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制冷原理与设备试题
《制冷原理与设备》试题库
第一部分:
英文试题库
PART1.EnglishtestforRefrigerationandAirConditioning
1.Thermostaticexpansionvalveare____________.
A.eitherallthewayopenorallthewayclosed
B.normallyopen
C.throttleddependingonload
D.controlledbysuctionpressure
2.Whichofthefollowingmaycausethatexcessivelywarmwaterleavesthecondenserinarefrigerationplant?
①toolittlecoolingwater;②toomuchcoolingwater;③toowarmcoolingwater.
A.①onlyB.anyof①,②and③C.either①or③D.either①or②
3.Ifarefrigerationcompressorisrunningcontinuouslywithoutloweringtemperatureasnormalintherefrigerator.thetroublemaybe________.
A.excessivecondensercoolingwater
B.warmfoodintherefrigerater
C.ashortageofrefrigerant
D.ashortageofcompressoroil
4.Thecoloroftheflameonahalidetorchwithoutanyrefrigerantpresentis_______.
A.blue
B.green
C.orange
D.purple
5.Ihecompressorsuctionlineconveystherefrigerantvaporfrom________.
A.condensertoevaporator
B.evaporatortocompressor
C.compressortocondenser
D.noneoftheabove
6.Athermostaticexpansionvalveisproperlycontrollingevaporatorsuperheat.adjustingthisvalvetolowerthesuperheatwillresultina/an__________.
A.evaporatorpressuredecrease
B.evaporatorcoilover-feed
C.evaporatorcapacityincrease
D.evaporatorvalvediaphragmrupture
7..Therefrigerationsystemlowpressurecutoutswitchisactuatedby_________.
A.anelectricsystemmanger
B.asensingbulbatthetailcoiloftheevaporator
C.pressurechangesinthesuctionline
D.failureofthekingsolenoidvalve
8.Thesensinglineforthelowpressurecutoutswitchtoarefrigerationsystemislocated_____.
A.inthechillbox
B.beforethereceiver
C.onthesuctionsideofthecompressor
D.onthedischargesideofthecompressor
9.Intheproductionoffreshwaterfromseawaterthroughaprocessofheatingandcooling,thecoolingphaseofproductionisusuallycalled_____.
A.evaporation
B.distillation
C.dehydration
D.condensation
10.Theheatgainedperpoundofrefrigerantintheevaporatorisknownasthe___.
A.latentheatofvaporization
B.sensibleheat
C.refrigeratingeffect
D.specificheatofvaporization
11.Theprocessofremovingmoisturefromairisknownas_____.
A.humidification
B.dehumidification
C.vaporization
D.evaporation
12.Ifairat95centigradedegreedrytemperatureand50%relativehumidityisconditionedto75centigradedegreedrybulbtemperatureand50%relativehumidity,itisanexampleof___.
A.coolingonly
B.coolingandhumidifying
C.coolinganddehumidifying
D.adiabaticcooling
13.Whenliquidreachesthecompressorofarefrigerationsystemthroughthesuctionline,theconditioniscalled____.
A.floodingback
B.superheating
C.overflowing
D.recycling
14.Increasingthemoisturecontentofconditionedairisknownas____.
A.moisturizing
B.dehumidification
C.dampening
D.humidification
15.Thesumofthesensibleheatandthelatentheatofanysubstanceisknownas___>
A.totalheat
B.residualheat
C.specificheat
D.superheat
16.Theheatidentifiedbyonlyachangeintemperatureisknownass_______.
A.sensibleheat
B.latentheat
C.totalheat
D.residualheat
17.Inreferencetoairconditioning,whenairattainsthemaximumamountofmoistureitcanholdataspecifictemperature,itissaidtobe____.
A.superheatee
B.saturated
C.condensed
D.convected
18.Whichofthefollowingtermsrepresentstheformofheatremovedfromtherefrigerantinthecondenserofarefrigerationsystem?
A.Latentheatofvaporization
B.Heatofcompression
C.Superheat
D.Alloftheabove
19.Thedewpointofairisreachedwhenthewetbulbtemperatureis__.
A.twicethedrybulbtemperature
B.10”Cabovethedrybulbtemperature
C.5”cabovethedrybulbtemperature
D.equaltothedrybulbtemperature
20.Thetemperatureatwhichwatervaporintheatmospherebeginstocondenseiscalledthe___.
A.dewpointtemperature
B.condensationtemperature
C.psychometrictemperature
D.absolutehumiditytemperature
21.Theonlymeansofremovingthelatentheatofcondensationfromarefrigerantinthenormalrefrigerationcycleisby__.
A.passingitthroughtheexpansionvalve
B.condensingrefrigerantinthesystemcondenser
C.passingthegaseousrefrigerantthroughtheheatinterchangeronthesuctionsideofthecompressor
D.maintainingahighpressureonthesystem’sreceiver
22.Theheatrequiretochangeasubstancefromasolidtoaliquidwhileatitsfreezingtemperature,isknownasthelatentheatof____.
A.fusion
B.vaporization
C.condensasion
D.sublimation
23.Theamountmoistureinagivensampleofair,whencomparedwiththeamountofmoisturetheaircouldholdiftotallysaturatedattheexistingtemperatureofthesample,iscalled___>
A.absolutehumidity
B.specifichumidity
C.effectivehumidity
D.relativehumidity
24.Ammoniawhenusedasarefrigerantisvaluablebecauseofitshighefficiency,itishowever____.
A.toxic
B.flammable
C.explosive
D.alloftheabove
25.R-12generallyconsideredtobeasafe,nontoxic,nonflammable,andnon-explosiverefrigerant.Itcan,however,becomehighlytoxicwhen____.
A.superheatedoutsidethesystem
B.incontactwithanopenflame
C.heatedtotheboilingpoint
D.Alloftheabove
26.Arefrigerationsystemcontaminatedwithmoisturecanbeaffectedby___.
A.acidformation
B.sludgeformation
C.iceintheexpansionvalve
D.Alloftheabove
27.Moistureisremovedfromarefrigerationsystemby__.
A.bleedingrefrigerantformthecondenser
B.openingadrainpetcockontheoilseparator
C.condensingthewaterintheheatexchanger
D.usingadehydratorcartridge
28.Moistureintherefrigerantmay_.
A.freezeontheexpansionvalveseatandreducetheflowofliquidrefrigerant
B.emulsifytheoilinthecondenser
C.freezeinthekingvalve
D.clogtheoiltrap
29Moistureinarefrigerationsystemcancause________.
A.freezingtheexpansionvalveclosed
B.corrosionofsystempiping
C.impropertemperatureregulation
D.alloftheabove
30.Mostsolenoidvalveareactuatedby___.
A,.aspring
B.anelectromagnet
C.theforceofgravity
D.refrigerantpressure
31.Arefrigerationsystemcompressorcrankcaseissweatingorunusuallycold.Thisisanindicationof________.
A.ashortageofrefrigerantinthesystem
B.airinthesystem
C.anaccumulationofliquidrefrigerantinthecrankcase
D.ashortageofoilinthecrankcase
32.Ifarefrigerationsystemcompressorcrankcaseissweating,youshould_.
A.addrefrigeranttothesystem
B.adjustthethermalexpansionvalvetothepropersetting
C.adjustthefloatvalvetotheproperholdingpressure
D.openthehandexpansionvalve
33.Thesensibleheatofairisdependentuponthe_______.
A.drybulbtemperature
B.wetbulbtemperature
C.saturationtemperature
D.watervaporsuperheat
34.Ifarefrigerationcompressorwereshortcyclingonthelowpressurecutoutswitch,theprobablecauseforthismightbethe____.
A.systemwasoverchargedwithrefrigerant
B.highpressureswitchwasimproperlyadjusted
C.expansionvalvestrainerswerefouled
D.suctionvalveswereleakingslightly
35.Arefrigerationunitwilltendtoshortcyclewhenoperatin_______.
A.underheavyloads
B.duringhotgasdefrost
C.underlightloads
D.duringstartingconditions
36.Ifarefrigerationcompressorwillnotstart,thereasonmaybe______.
A.thepressureregulatingvalveisnotclosing
B.anexcessivelackofrefrigerantinthesystem
C.badlyleakingdischargevalve
D.wornpistonrings
37.Aircompressorsareequippedwithunloadingsystemforthepurposeof______.
A.removingallbutthefrictionalloadduringstaring
B.relievingintercoolersofhightemperaturebuildups
C.providinghighstartingtorqueinthedrivemotor
D.seatingvalveplatesduringcompressorshutdown
38.Airenteringanair-cooledrefrigerationsystemisindicatedby______.
A.frostingoftheliquidline
B.higherthannormalheadpressure
C.aclearsightglass
D.abnormallycoldreeferboxes
39.Refrigerantisnormallysub-cooledinarefrigerationorairconditioningsystemcondenserto_.
A.maintainadequatecoilbackpressure
B.prohibitflashingintheliquidline
C.reducerefrigerantvolumeinthesystem
D.reducecompressordischargelineloading
40.Theprinciplepurposeofsub-coolingliquidrefrigerantpriortoitsenteringtheexpansionvalveisto__.
A.increasetherefrigeratingeffectbydecreasingtheamountofflashgas
B.allowtherefrigeranttoenterthethrottlingdeviceinasaturatedcondition
C.increasetherefrigeratingeffectbyincreasingtheamountofflashgas
D.minimizethetemperaturedropoftheliquidasitpassesthroughthesolenoidvalvetotheoutletside
41.Sub-coolingisamethodreducingthetemperatureoftheliquidrefrigerantbelowits____.
A.freezingpoint
B.flocpoint
C.condensingtemperature
D.compressiontemperature
42.Refrigerantentersthecondenserasa______.
A.highpressureliquid
B.lowpressurevapor
C.highpressurevapor
D.lowpressureliquid
43.Inarefrigerationsystem,theamountofrefrigerantadmittedtotheevaporatorisdirectlyrelatedto_.
A.thecompressordischargepressure
B.condensercoolingwatertemperature
C.thesolenoidvalvedifferentialpressure
D.thesuperheatoftherefrigerantinthetailcoil
44.Therefrigerantgasreturningtothecompressorshouldbe__.
A.superheated
B.saturated
C.dense
D.flooded
45.Thelowpressuresideofarefrigerationsystemisconsideredtoexistfromthe___.
A.expansionvalvetothecompressor
B.receivertotheex
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