热工仪表初选择（Initialselectionofthermalinstrument）

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热工仪表初选择(Initialselectionofthermalinstrument)Multiple-choicequestions1.Whentheelectricfieldisusedtodescribetheelectricfield,theelectricfieldoftheuniformelectricfieldis().Aandperpendiculartoeachother;Bandparalleltoeachother;Candpowerlinesintersect.Answer:B.2.Thecurrentflowingintotheconductoratthesametimeisequaltothecurrentflowingoutoftheconductor.Thisprincipleiscalled()principle.A,currentequivalence,B,currentinvariance,C,continuityofcurrent.Answer:C.3,theelectricfieldforcestheelectricchargefrom()toformcurrent.A,lowpotentialshifttohighpotential;B,highpotentialshifttolowpotential;C,translationdistance.Answer:A.4,intheoutercircuit,theelectricforceforcesthepositivechargefromthepath(from)toformthecurrent.

1A,lowpotentialshiftedtohighpotential;B,highpotentialshiftedtolowpotential;Cshiftedadistance.Answer:B.3,intheload,thedirectionofthecurrentandthedirectionofthevoltageisalways().A,opposite;B,consistent;C,arbitrary.Answer:B.4,inthepowersupply,thedirectionofthecurrentandvoltageis().A,consistent;B,opposite;C,same.Answer:B.5,PtypesemiconductorsandNtypesemiconductorsallhavecarriers,butthesemiconductordevicesthemselvesare().A,uncharged;B,positivelycharged;C,negativelycharged.Answer:A.6,theintrinsicsemiconductorsgeneratecarriersduetothermalmotion,leadingtothepresenceof()intheintrinsicsemiconductorsA,electroncarriers,B,holecarriers,C,electroncarriersandholecarriers.Answer:C.

23,Ptypesemiconductorischaracterizedby()TheconcentrationofAandfreeelectronsisgreaterthantheconcentrationofholes;theconcentrationofBandholesisgreaterthantheconcentrationoffreeelectrons;theconcentrationofCandfreeelectronsisequaltotheconcentrationofholes.Answer:B.4,Accordingtotheminorerrorcriterion,themeasurementdataisusuallyadjustedaccordingtothe(allowed)errorofthemeasurement.A,0.05;B,0.1;C,0.5.Answer:B.11,theknowntruevalueis200degreescentigrade,themeasurementresultis202degreescentigrade,andtheabsoluteerroris().A,2,B,-2,C,2.Answer:A.12,Thestandardofmeasuringinstrumentsisusuallycalledqualityindex.A,performance;B,quality;C,manufacturingprocess.Answer:B.13,accordingtothetechnicalconditionsoftheinstrument,the

3allowablemaximum()iscalledthemaximumallowableerroroftheinstrument.A,basicerror,B,absoluteerror,C,relativeerror.Answer:B.11,accordingtotheprincipleofthedetectiondevice,itcanbeseenthatthemeasurementoftheelectromotiveforcebythebalanceandthemeasurementofelectromotiveforcewiththepotentialdifferencemeterbelongto()measuringmethod.A,minutedifferencemethod,Bandzerovaluemethod,Candindirectmethod.Answer:B.12,DDZ-IIImetertypeDKJinstrument,which'K'means().A,transferunit,B,executionunit,C,conversionunit.Answer:B.13,Thesignofthermodynamictemperatureis().A,K;B,T;C,t.Answer:B.14,Thethermometerthatisnotsuitableformeasuringfluctuationsatroomtemperatureis().

4A,pressurethermometer,B,rodthermometer,C,bimetallicthermometer.Answer:A.11,thesymbolofCelsiustemperatureist,whoseunitiscentigrade,andthesymbolofunitis().A,K;B,T;C,C.Answer:C.12,TherelationshipbetweenthetemperatureTandthethermodynamictemperatureTis().A,t=T+273.15;B,t=T-273.15;C,t=T-273.16.Answer:B.13,Thegasfilledthermometerismadeaccordingtothecharacteristicthatthegaschangeswiththetemperatureatthepressure.UndertheconditionsofAandconstantvolume,B,underanyconditions,C,andcertainenvironmentaltemperature.Answer:A.In198621,IPTS-68providedthermodynamictemperatureofthetriplepointofwater(is).A,273K;B,273.15K;C,273.16K.

5Answer:C.22,Inthefollowingkindsofthermalresistance,themostcommonlyusedstandardthermalresistanceinindustryis().AandGethermalresistance;Bandplatinumthermalresistance;CandNithermalresistance.Answer:B.23,1968IPTS-68provisionsofthetriplepointofwatervalue(Celsius).A,0,B,-0.01,C,0.01.Answer:C.24,TheresistancevalueofcopperresistorwithCu50is0.A,53;B,46;C,50.Answer:C.25,Theresistancevalueofthethermalresistanceat0degreescentigradeisPtlOO.A,46;B,100;C,50.Answer:B.26,twodifferentmetalconductorweldingclosedloopiscalledthermocouple,whenthetwoweldingendtemperatureisnotatthesame

6time,inthethermocouplecircuit().Adoesnotproduceanypotential;Bproducesthermalpotential;Cdoesnotproducecurrent.Answer:B.24,thermocouplethermoelectricpotential,ifkeepcoldendtemperatureconstant,thermocoupleproducethermalpotential0.Aisonlyrelatedtothetemperatureofthehotend;B,andinverselyproportionaltothetemperatureatthehotend;Cwillremainunchanged.Answer:A.25,trytodeterminethefollowingthermocouple,whichisnon-standardthermocouple(?).A,nickelchromium-nickelsiliconthermocouple;B,nickelcobalt-nickelsiliconthermocouple;Cironandconstantanthermocouple.Answer:B.26,trytodeterminethefollowingthermocouple,whichisastandardizedthermocouple(?).A,NiCrNiSithermocouple,B,NiCoNiSithermocouple,C,NiCoNiAlthermocouple.Answer:A.27,whenthethermocoupleoperatingtemperatureisdetermined,the

7thermocouplecoldjunctiontemperatureincreases,thermocouplethermoelectricpotential().A,increased;B,unchanged;C,decreased.Answer:C.24,TheaccuracyofthethermalpotentialmeasuredbytheDCpotentialdifferencemeterishigher,andtheinfluenceoftheexternalresistanceonthetemperatureischanged.A,mustconsider;B,neednotconsider;C,shouldconsider.Answer:B.25,Intheinternationalunitsystem,theunitofpressureisA,Pa;B,bar;C,kgf/cm2.Answer:A.33,theelasticelementissensitivetothechangeoftemperature,suchaselasticelementcontactwithhightemperaturemediumorbyhightemperatureradiation,elasticitywill(or),andproducemeasurementerror.A,deformation;B,increase;C,change.Answer:C.34,generallyusedUtubepressuregaugecolumnheightcannotexceed().

8A,1meters;B,1.5meters;C,2meters.Answer:B.33,liquidcolumnpressuregaugeindicationissmall,thereasonis().Aandpressurepipingarenotwellsealed;Bandguidepipeareblocked;Candairareblockedatoneend.Answer:A.34,thesinglecoilBourdontubepressuregauge,whenthepositivepressuremediumintothespringtube,thespringtubearclengthwill().A,variablelength,B,invariant,C,shorter.Answer:B.35,singlecoilBourdontubepressuregauge,whenthenegativepressuremediumintothespringtube,thecurvatureofthespringtubewillbe().A,smaller;B,larger;C,unchanged.Answer:B.36,whentheupperlimitofmeasurementislessthanorequalto0.25MPa,andusedtomeasurethepressureofgas,theapplicationofworkingmedium().

9A,air;B,water;C,transformeroil.Answer:A.33,Whenthepressuregaugeisinstalledabovethesamplingport,itszeropointisadopted.A,positivecorrection,B,negativecorrection,C,nocorrection.Answer:A.34,Checkthediaphragmdifferentialpressuretiming,andthestandardtableshouldbeselected().A,Utubedifferentialpressuregauge,B,pistonpressuregauge,C,singletubemanometer.Answer:A.35,Inthefollowingthrottlingparts,thestandardizedthrottlingdeviceis().A,VinChuliban,B,eccentricorificeplate,C,wingshapeddynamicpressuretube.Answer:A.36,inthe50〜500mminsidediameterpipeonthethrottle,standardnozzleandstandardholeplate,standardnozzle(accuracy).A,lower,B,higher;C,thesameasthestandardorifice.

10Answer:B.43.Atpresent,mostofthemainsteammeasurementsareadoptedinthermalpowerplants.A,standardorificeplate,B,standardnozzle,C,venturinozzle.Answer:B.44.Inthevariouselasticdifferentialpressuregauges,thetraveloftheelasticelementsofthedoublebellowsdifferentialpressuregauge.A,minimum,B,larger,C,max.Answer:C.45.thepressuregaugesignaltubeselectionrequirementsistoensurethatthepipelineisnotblocked,noleakage,delaytimeissmall,whenthesignalpipelineislessthan20meters,itsinnerdiametershouldbe().A,nolessthan3mm;B,nolessthan5mm;C,nolessthan8mm.Answer:A.46.theselectionofpressuregaugesistoensuretheaccuracyofthemeasurement,thepressureshallnotbelessthantheupperlimitoftheselectedpressuregauge().A,1/4;B,1/3;C,1/2.

11Answer:B.43.Inthefollowingflowmeter,theflowmetermeasuringvolumebyvolumemethodis().A,turbineflowmeter,B,Rootsflowmeter,C,electromagneticflowmeter.Answer:B.44.Theflowmetercommonlyusedformeasuringfuelquantityinthermalpowerplantis().A,differentialpressureflowmeter,B,rotorflowmeter,C,targetflowmeter.Answer:C.45.Whentheboilerisinnormaloperation,thewaterlevelofthemicawaterlevelgaugeonthedrumiscomparedwiththeactualwaterlevelinthedrum.A,higher;B,equal;C,low.Answer:C.46.Thewaterlevelcontaineroftheelectriccontactwaterlevelgaugemustbeinstalledvertically.Themiddlepointofthecylinder(zerowaterlevel)andthenormalwaterlevelofthedrum().A,atthesameheight;B,higherthan50cm;C,comparedwithlow50cm.

12Answer:A.43.Theinsulationresistancemustbemeasuredbeforetheelectrodeoftheelectriccontactwaterlevelgaugeisused,andthevalueoftheinsulationresistanceshouldbegreaterthan().A,20M;B,50M;C,100M.Answer:C.44.Thegaswillbemagnetizedbythemagneticfieldinthemagneticfield,andthedegreeofmagnetizationcanbeexpressedbythemagnetization.Themagnetizationisproportionaltothemagneticfieldintensitythatcausesthemagnetization.A,inverseratio,B,directratio,C,nonlinearity.Answer:B.45.therelationshipbetweenoxygenconcentrationpotentialandoxygenpartialpressureisnotlinear,but()relation.A,nonlinearity,B,logarithm,C,exponent.Answer:B.46.theamountofthedesiredquantityshouldbecalled().A,targetvalue;B,regulationquantity;C,givenvalue.Answer:C.

1343.Thevariousreasonscausingthedeviationfromthegivenvalueintheproductionprocessarecalled().A,interference,B,perturbation,C,deviation.Answer:B.44.Themechanismthatplaysaregulatoryroleintheregulatorysystemiscalled().A,disturbancemechanism,B,regulatingmechanism,C,actuator.Answer:B.45.Thesystemisnotcontrolledbytheoperatingpersonnelandcanproduceexternaldisturbances.A,disturbancemechanism,B,regulatingmechanism,C,actuator.Answer:A.46.thedisturbanceoccurringintheclosedloopsystemiscalled().A,internaldisturbances,B,externaldisturbances;Candbasicdisturbance.Answer:A.47.thedisturbanceoccurringoutsidetheclosedloopsystemiscalled().

14A,internaldisturbances,B,externaldisturbances,C,basicdisturbances.Answer:B.43.asameansofadjustmentofdisturbance,knownas().A,internaldisturbances,B,externaldisturbances,C,basicdisturbances.Answer:C.44.Intheblockdiagram,thearrowpointingtotheboxrepresents(),whichisthecauseofthechange.A,inputsignal,B,outputsignal,C,regulatedsignal.Answer:A.45.Intheblockdiagram,thearrowawayfromtheboxrepresents(),whichistheresultofthechange.A,inputsignal,B,outputsignal,C,disturbancesignal.Answer:B.46.Intheautomaticregulationsystem,theequilibriumstatethattheamountofregulationdoesnotchangewithtimeiscalledthesystem.A,dynamics,B,steadystate,C,staticstate.

15Answer:B,C.43.Theboilerregulatesthesteamtemperaturefromthefluegassidethrough().A,changetheburnerswingangle;B,temperaturereducer;C,pressurereducer.Answer:A.44.Thesteamtemperatureisregulatedbysteamfromthesteamsideoftheboiler.A,temperaturereducer,B,pressurereducer,C,changeburnerswingangle.Answer:A.45.TheboileraccidentwatergateisopenedwhenthewaterlevelishigherthantheIvalue.A,drum;B,C,highpressuredeaerator.Answer:A.46.Whentheboilerloadincreases,thesteamtemperatureattheoutletofthesuperheater.A,unchanged;B,decreased;C,increased.Answer:C.

1643.theturbinethroughthechange(),controltheamountofsteam,soastocompletethetaskofspeedregulation.A,rotorspeed;B,controlvalveopening;C,exhaustcheckgateopening.Answer:B.44.Whentheboilerisinnormaloperation,thewaterlevelofthedrumisshowntobehigherthanthatoftheactualwaterlevel.A,equal;B,higher;C,lower.Answer:C.45.Thetaskofautomaticpressureadjustmentofdeaeratoristocontrolthepressureindeaeratortobesaturatedpressure,andtoensurethatfeedwaterisheatedtosaturationtemperature,soastoimprovethedeoxidizationeffect.A,watersupply;B,steamspace;C,steamwatermixture.Answer:B.46.Highpressureheatersinthermalpowerplantsareheatedbysteamextractionfromsteamturbines.A,watersupply,B,condensedwater,C,hydrophobic.Answer:A.47.Whenthedrumisinnormaloperation,itswalltemperatureshould

17be().A,upperwalltemperatureishigherthanthelowerwalltemperature;B,upperandlowerwalltemperatureareequal;C,lowerwalltemperatureishigherthantheupperwalltemperature.Answer:A.43.becausethesuperheaterisaheatexchanger,itsoutletsteamtemperaturereflectstherelationshipbetweentheheatandheatofthesteam.Aabsorptionfromthefluegasside;B,evaporationheatingsurfaceabsorbheat;C,boilerheatstorage.Answer:A.44.whentheheatingsurfaceslaggingorashaccumulationistoolong,sothattheconvectionsuperheaterabsorbheatincrease,superheatedsteamtemperature().A,decrease,B,increase,C,unchanged.Answer:B.45.whenthefeedwatertemperaturedecreases,iftheamountoffuelremainsunchanged,theevaporationwillbereducedaccordingly,sothesuperheatedsteamtemperature().A,unchanged;B,decreased;C,increased.Answer:C.

1843.whenthepulverizedcoalisthickenedortheburneranglerises,theflamecenterpositionmovesupward,sothatthesuperheatedsteamtemperature().A,unchanged;B,decreased;C,increased.Answer:C.44.ifthedecayrateisequalto0,thentheregulationprocessis(process).A,equalamplitudeoscillation,B,divergentoscillation,C,nonperiodic.Answer:A.45.ifthedecayrateisequalto1,thentheregulationprocessis(process).A,equalamplitudeoscillation,B,divergentoscillation,C,nonperiodic.Answer:C.46.ifthedecayrateis<0,thentheregulationprocessis(process).A,equalamplitudeoscillation,B,divergentoscillation,C,nonperiodic.Answer:B.

1980.Itcanreducethedynamicdeviationoftheregulatedquantityintheadjustmentprocessandadjusttheprocesstime.Aandproportionalaction;Bandintegralaction;Canddifferentialaction.Answer:C.81.Thestaticdeviationcanbeeliminatedsothatthedynamicdeviationandtheregulatingtimeoftheregulatedamountintheregulationprocessareincreased.Aandproportionalaction;Bandintegralaction;Canddifferentialaction.Answer:B.82.Themostbasicregulatingfunctioninallkindsofregulationis().Aandproportionalaction;Bandintegralaction;Canddifferentialaction.Answer:A.83.waterbalancecontainerbeforethedoortransverseinstallation,inordertoavoidthevalve()andaffecttheaccuracyofthemeasurement.A,accumulationofemptybubbles,B,liquidleveldifference,C,throttlingeffect.

20Answer:A.84.Thedifferentialpressuretransmitterwithoutputsignalof4-20mAisusedasthedrumleveltransmitter.Whenthewaterleveliszero,thetransmitteroutputis().A,4mA;B,12mA;C,0mA.Answer:B.85.Themostcommonlyusedflowmeasuringinstrumentinthermalpowerplantis().A,volumeflowmeter,B,targetflowmeter,Canddifferentialpressureflowmeter.Answer:C.86.Throttlingdeviceusedinsteamflowmeasurementinthermalpowerplantiswidelyused.A,nozzle;B,KongBan;C,dynamicpressuretube.Answer:A.87.Thefeedwaterregulationsystemofhightemperatureandhighpressureboilergenerallyadopts()regulatingsystem.A,singleimpulse,B,doubleimpulse,C,threeimpulse.Answer:C.

2184.itcaneliminatethebadinfluenceof"falsewaterlevel”,butcannotquicklyeliminatethespontaneousdisturbanceofwatersupplyflowandtimelyreflecttheregulationeffectis()watersupplyregulationsystem.A,singleimpulse,B,doubleimpulse,C,threeimpulse.Answer:B.85.inthemainsteamtemperatureautomaticregulationsystem,thetemperaturetransmitterzeromustbecarriedout(),inordertoimprovetheaccuracyofmeasurement.A,positivemigration,B,negativetransfer,C,nonmigration.Answer:A.90,Itisbettertomeasuretheflowrateofboilerairpipe.Aandrootsflowmeter;B,KongBan;C,wingshapeddynamicpressurepipe.Answer:C.91,aftertheblowerortheinduceddraftfaniscutoff,themainfueltripactionshouldbedelayed,andthebaffleofthetripfanshouldbeslowlyopened,andtheopeningstateshouldbenolessthan().A,5min;B,lOmin;C,15min.Answer:C.

2292.Atpresent,thesoundsystemwidelyusedinthermalpowerplantsis().AandACrepeatsoundsignalsystem;BandDCrepeatsoundsignalsystem;CandACnonrepetitivesignalsystem.Answer:A.93.inthepowerplantbetweenthemaincontrolroomandthesteamroom,boilerroom,touse()totransferafewbutveryimportantoperationalterms,ortoinformeachotheroftheunit，soperatingstate.A,contactsignal,B,advancesignal,C,accidentsignal.Answer:A.94.whenthepressureincreasestotheIIvalue,stoppartofthepowderoropen().A,safetydoor,B,airexhaustvalve,C,steamextractioncheckgate.Answer:B.95.Thepowerofthepulsedelectromagneticsafetydooris().A,compressedair;B,steam;C,pressurewater.Answer:B.96.Therelayisarelaythatcanbeautomaticallyswitchedbymeans

23of(or)otherphysicalquantities.A,mechanicalforce,B,electromagneticforce,C,current.Answer:B.92.Inthestart,stopandoperationoftheturbine,whentheaxialthrustoftherotoristoolargeortheoiltemperatureistoohigh,theoilfilmisdestroyed,Wujinthrustpadwillbedestroyed,causingtheturbinestaticpartoffriction,aseriousaccident,therefore,set(device).Aandaxialdisplacementmeasurementprotection;Bandrelativeexpansionprotection;Candabsoluteexpansionmeasurementprotection.Answer:A.93.whenthewaterlevelisuptoIII,theprotectionsystemaction().A,sendoutthewarningsignal;B,opentheaccidentwatergate;C,sendoutthestopsignal.Answer:C.99.Thefurnaceflameisdark,theprotectionsystemsendsout(),causestheoperatortopayattention,andtakesthemeasuretoeliminatethebreakdown.A,advancesignal,B,connectionsignal,C,accidentsignal.

24Answer:A.100,themostcriticalpartofflamedetectiondeviceisthedetectionelement(alsoknownastheprobe),theuseofittochangethestrengthofthefurnaceflameinto().1,electricalsignals;B,switchingsignals;C,"0"or".Answer:A.101,Thefollowingrelay,()istheelectricquantityrelay.A,pressurerelay,B,temperaturerelay,C,timerelay.Answer:C.102,thefollowingrelay,()isnonelectricalrelay.A,pressurerelay,B,currentrelay,C,liquidlevelrelay.Answer:C.103,Thefunctionofthetorquelimitingmechanismistocutoffthemotoroperatingcircuitthroughthemicroswitchwhentheoutputtorquereaches()therequiredvalue.A,bigvalve;B,smallvalve;C,GuanYanvalve.Answer:C.104,thecablelayinginthebracketorbridge,requireneatarrangement,reducewithotherequipment,pipelinecross,andcan

25preventcablewithstand().A,excessivetensileortransitionalbending;B,mechanicaldamage;C,excessivecrossandwaste.Answer:A,B.101,theuseofelectrichammerorimpactdrillhole,drillheadshouldbedrilledintheopenintheface,(to).A,avoidemptyhit;B,speedup;C,preventdeviation.Answer:A.102,flamemonitoringdevice,istheuseofultravioletphotosensitivetubeintheultravioletsignalinto()controlsignal.A,current;B,voltage;C,resistance.Answer:B.103,intheoperationofthesteamturbine,theaxialdisplacementoftherotorishowtomovethetransmitter:().A,movealongwiththerotor;B,movealongwiththecylinder;C,donotmove.Answer:B.104,inthepowerproductionprocess,sometimeshopethattherotatingmachineryonlyinacertainrangeofoperation,whichcanbeused()tocontrol.

26A,controlswitch,B,button,C,strokeswitch.Answer:C.109,Themostfrequentlyusedrelayinthethermalcontrolis0relay.A,voltage;B,current;C,electromagnetism.Answer:C.110,Itisgenerallyusedtocontroltheopeningorclosingoftheelectricdoor,andtheconnectionanddisconnectionoftheinterlockingcircuit.A,strokeswitch,B,controlswitch,C,magneticstarter.Answer:B.111,Therelaythatcanreflectthepolarityoftheinputsignalis().A,dryreedrelay,B,polarizationrelay,C,intermediaterelay.Answer:B.112,Therelaythatusesthemeasuringelementtoheattoacertaintemperatureis().A,temperaturerelay,B,thermalrelay.Candpolarizationrelay.Answer:B.113,whenthefurnaceflamebecomesdark,theprotectionsystemaction

27().A,stoppingpowderfeedingmachine,B,oilfeedingandcombustionsupporting,C,stoppingfurnace.Answer:B.109,()isanimportantdeviceforhighboilerpressureprotection.A,airexhaustvalve,B,safetydoor,C,steamextractioncheckgate.Answer:B.110,whenthewaterlevelishighII,theprotectionsystemaction().A,warningsignal,B,emergencyshutdowngate,C,stopfurnace.Answer:B.111,whenthewaterlevelislowIIIvalue,Protectionsystemaction().A,sendalarmsignal;B,openandstandbytowatergate;C,stopfurnace.Answer:C.112,Thethermalsignalsusedtorepresentthestateoftheequipmentinthethermalsystemarecalled().

28A,trendalarmsignal,B,statesignal,C,overlimitalarmsignal.Answer:B.109,()usedtoinformtheoperatingpersonnelinthesystemsomestateinformation,suchasthenormalstartstopofequipmentandvalveopeningandclosing.A,generalalarm;B,seriousalarm;C,unittripalarm.Answer:A.110,remindtheoperator,someofthestateparametersinthesystemhasseriouslydeviatedfromtheprescribedvalue,musttakecountermeasuresseriouslyalarmsignalbelongsto().A,generalalarm;B,seriousalarm;C,unittripalarm.Answer:B.120.Themaximumexpansiondifferencebetweenrotorandcylinderisin().A,highpressurecylinder,B,mediumpressurecylinder,C,LPcylinderonbothsides.Answer:C.121.Therotorexpandsfromthethrustdiskandextendsatthemaximum.

29A,thrustdisk,B,mediumpressurecylinder,C,LPcylinder.Answer:C.120.Theadvancedprotectionofgeneratorloadrejectionis().A,overspeedprotection,B,steamextractioncheckgateprotection,C,powerloadunbalanceprotection.Answer:C.121.theaxialdisplacementprotectionofturbineshouldbeputin().A,normaloperation;B,prerotating,C,ratedspeed.Answer:B.122.Lowvacuumprotectionofturbine,shouldbeputin().A,normaloperation;B,prerotating,C,ratedspeed.Answer:B.123.turbinelowoilpressureprotection,shouldbein()input.A,normaloperation;B,beforeturningandturningbeforeC.Answer:C.124.Steamturbinevibrationprotectionshouldbeputin().

30A,normaloperation;B,beforeturningandturningbeforeC.Answer:C.120.Theinstrumentwhichcanprovidefastoxygensignalforboilercombustionregulationis().A,zirconiaoxygenmeter,B,thermomagneticoxygenmeter.Answer:A.121.steamturbineoverspeedprotection,shouldbein()investment.A,normaloperation;B,beforeturningandturningbeforeC.Answer:B.122.Whattheflowaccumulatorrecordsis().A,instantaneousflow,B,cumulativeflow.Answer:B.123.Atpresent,themeterwithhighestaccuracyofturbinespeedmeasurementis().A,tachometergenerator,B,magnetictachometer,C,digitaltachometer.Answer:C.124.Feedwaterflowmeasurementinthermalpowerplant,thethrottle

31componentisselected().A,orificeplate;B,nozzle;C,venturitube.Answer:A.120.Cumulativeflowistheamountofmaterialpassingthroughasectionofthepipeintime.A,unit,B,asection.Answer:B.121.Theworkingsubstanceofthermalpowerplantis().A,water;B,air;C,watervapor.Answer:C.122.Absolutepressureis().A,thetruepressureofgas;thepressureindicatedbyBandpressuregauge;thepressureindicatedbyCandvacuumgaugeAnswer:A.