雨课堂学堂在线学堂云Modern Measurement Technology(北京理工大学)单元测试考核答案

目录：Chapter1AnoverviewofmeasurementChapter2StandardsandDimensionalUnitsofMeasurementChapter3AssessingandPresentingExperimentalChapter4TheAnylogMeasurandTime-DependentChararcteristicsVChapter5TheResponseofMeasuringSystemsChapter6SensorsChapter7SignalconditioningChapter8Modernsignalprocessing第1题Ameasurementvalueisbetterthannothing.第2题Thereisnoperfectanswer,noperfectmeasure.第3题Majorityoftransducersinuseconvertthemechanicalinputintoananalogouselectricalform.第4题Single-pointcalibrationworkswhentheoutputisnotsimplyproportional.第5题Theprocessortheactofmeasurementconsistsofobtainingaquantitativecomparisonbetweena____andameasurand.正确答案：:predefinedstandard第6题Typicalquantitieswithinthescopeofmechanicalmeasurementsare____,____,____,____、____、____、____.正确答案：:length正确答案：:time正确答案：:temperature正确答案：:weight正确答案：:strain正确答案：:velocity正确答案：:acceleration第7题FoundmentalMethodsofMeasurementare____,____.正确答案：:directcomparison正确答案：:indirectcomparison第8题Mostmeasuringsystemsfallwithintheframeworkofageneralarrangementconsistingofthreephasesorstages:____stage,____stage,____stage.正确答案：:sensor-transducer正确答案：:signal-conditioning正确答案：:readout-recording第9题An____canincreaseeitheramplitudeorpowerofthesignal,orboth,tothelevelrequiredtodrivethefinalterminatingdevice.正确答案：:amplifier第10题Anacceleration-timesignalcanbetransferredtoavelocity-timerelationbyan____.正确答案：:integrator第11题Therearetwokindsofnonrepetitiveortransientsignal:____,____.正确答案：:Singlepulseoraperiodic正确答案：:Continuingorrandom第12题____procedurecanhelptoestablishesthecorrectoutputscaleforthemeasuringsystem.正确答案：:calibration第13题Theprocessortheactofmeasurementconsistsofobtainingaquantitativecomparisonbetweena____andameasurand.正确答案：:predefinedstandard第14题Theprocessortheactofmeasurementconsistsof____betweenapredefinedstandardandameasurand.正确答案：:obtainingaquantitativecomparison第15题Thewordmeasurandisusedtodesignatetheparticular____beingobservedandquanlified;thatis,theinputquantitytothemeasuringprocess.正确答案：:particularphysicalparameter第16题Thestandardofcomparisonmustbeofthesame____asthemeasurand,andusually,butnotalways,isprescribedanddefinedbya____.正确答案：:character正确答案：:legalorrecognizedagencyororganization第17题Namethreestandardizationorganizationsyouknow,____,____,____.____.正确答案：:ISO正确答案：:CNIS正确答案：:NIST正确答案：:ANSI第18题Typicalquantitieswithinthescopeofmechanicalmeasurementsare____,____,____,____.____.____.____.正确答案：:length正确答案：:time正确答案：:temperature正确答案：:weight正确答案：:strain正确答案：:velocity正确答案：:acceleration第19题Tobeuseful,measurementmustbe____and____.正确答案：:reliable正确答案：:valid第20题____

referstotheconsistencyofameasure.正确答案：:Reliability/Precision第21题____

istheextenttowhichthescoresfromameasurerepresentthevariabletheyareintendedto.正确答案：:Validity/accuracy第22题FoundmentalMethodsofMeasurementare____,____正确答案：:directcomparison正确答案：:indirectcomparison第23题Lengthmeasurementusingatapeisa____comparison正确答案：:direct第24题sensor-transducerstageshouldbe____toeveryotherpossibleinput正确答案：:insensitive第25题Unwantedsensitivityisameasuringerror,called____whenitvariesrapidlyand____whenitvariesveryslowly.正确答案：:noise正确答案：:drift第26题thesignal-conditioningstagemayperformoneormorebasicoperations,suchas____,____,____,____,____asmayberequired.正确答案：:filtering正确答案：:amplifiering正确答案：:integration正确答案：:differentiation正确答案：:telemetering第27题Thereadout-recordingstagepresentedinoneofthefollowingformsl:____,____正确答案：:arelativedisplacement正确答案：:digitalform第28题Tiregageconsistsofacylinderandpiston,aspringresistingthepistonmovement,andastemwithscaledivisions.thepiston-cylindercombinationconstitutesaforce-summingapparatus,sensingandtransducing____to____,thespringconvertsthe____to____.正确答案：:pressure正确答案：:force正确答案：:force正确答案：:displacement第29题Mechanicalquantities,inadditiontotheirinherentdefiningcharacteristics,maybeclassifiedas____,____正确答案：:static正确答案：:dynamic第30题Therearetwokindsofnonrepetitiveortransientsignal:____,____正确答案：:Singlepulseoraperiodic正确答案：:Continuingorrandom第1题Themodernmetreis().Athelengthofthepathtravelledbylightinvacuumduringatimeintervalof1/29,97,92,458ofasecondB16,50,763.73×wavelengthsofthered–orangeradiationofakrypton86atominvacuumCthelengthofthepathtravelledbylightinvacuumduringatimeintervalof1/399,792,458ofasecondD1,660,793.73×wavelengthsoftheredorangeradiationofakrypton86atominvacuum第2题Theaimofcalibrationisto().AmeetcustomerrequirementBdetectdeteriorationofaccuracyCcomplywithISO9000standardrequirementsDpractisemeasurementprocedures第3题Conformityofaphysicalquantitytothenationalstandardofmeasurementisknownas().AcalibrationBtraceabilityCsensitivityDrepeatability第4题Thedimensionalunitisthebasisforquantificationoftheentity.第5题ThepermanentofficeofTheOrganisationInternationaleDEMetrologieLegale-OIMLisBIPM,basedinParis,France.第6题RankineistheSIunitfortemperature.第7题Alltheseconddimensionsandunitscanbederivedascombinationsofprimarydimensions.第8题Aphysicalstandardisanartifact.第9题Thenumberofrelevantorusefuldigitsinameasurementshouldberestricted.第10题4.00×10^3has4significantdigits.第11题Therearetwoprimaryunitsystemsinusetoday:____,____.正确答案：:theInternationalSystemofUnits正确答案：:theEnglishEngineeringSystemofUnits第12题Thesevendimensionalsystemincludes____,____,____,____,____,____,____.正确答案：:length正确答案：:mass正确答案：:time正确答案：:electriccurrent正确答案：:thermodynamictemperature正确答案：:luminousinternsity正确答案：:mole第13题Thereviseddefinitionsisbasedonseven____.正确答案：:physicalconstants第14题第15题Becausedifferentsystemsofunitsexist,themethodof____fromsystemtosystemmustbemutuallyagreedupon.正确答案：:conversion第16题ifthecalibrationistobemeaningful,theknowninputmustitselfbederivedfroma____.正确答案：:definedstandard第17题Single-pointcalibrationcanbeusedwhentheoutputis____totheinput.正确答案：:proportional第18题____calibrationsareusedtoimprovestheaccuracyofthecalibration正确答案：:multipoint第19题Theunitsystem,meansnotonlytheestablishmentof____,butalsotheagreementonthe____.正确答案：:unitstandard正确答案：:basisforconversion第20题Thedimensionalunitisthebasisforquantificationoftheentity第21题Therearetwoprimaryunitsystemsinusetoday:____,____正确答案：:theInternationalSystemofUnits正确答案：:theEnglishEngineeringSystemofUnits第22题TheInternationalSystemofUnits,SIsystemwasaproductoftheFrenchRevolution.第23题1971,the14thconferenceaddedthe____astheunitforamountof____,completingthesevendimensionalsysteminusetoday.正确答案：:mole正确答案：:substance第24题ThepermanentofficeofTheOrganisationInternationaleDEMetrologieLegale-OIMLisBIPM,basedinParis,France第25题RankineistheSIunitfortemperature第26题Allotherdimensionsandunitscanbederivedascombinationsofthesesevendimensions.第27题Astandardcanbe().Aanartifact(prototype)BanaturalphenomenonCastandardizedprocedureofmeasurementusingstandardizedmeasurementmethodsandequipmentDAboveall第28题The____standardispreservedunderthemostcarefulconditionsandimprovedinanationalinstituteofstandardsandtechnology.正确答案：:primary第29题The____standardiscomparedatregularintervalswithprimaryStandsandrecordstheir____.正确答案：:secondary正确答案：:deviation第30题Themodernmetreis______.Athelengthofthepathtravelledbylightinvacuumduringatimeintervalof1/29,97,92,458ofasecondB16,50,763.73×wavelengthsofthered–orangeradiationofakrypton86atominvacuumCthelengthofthepathtravelledbylightinvacuumduringatimeintervalof1/399,792,458ofasecondD1,660,793.73×wavelengthsoftheredorangeradiationofakrypton86atominvacuum第31题TheaimofcalibrationistoAmeetcustomerrequirementBdetectdeteriorationofaccuracyCcomplywithISO9000standardrequirementsDpractisemeasurementprocedures第32题ConformityofaphysicalquantitytothenationalstandardofmeasurementisknownasAcalibrationBtraceabilityCsensitivityDrepeatabilityExercise第1题Whenasetofreadingsofameasurementhasawiderange,itindicatesAhighprecisionBhighaccuracyClowprecisionDlowaccuracy第2题ThedifferencebetweenthelowerandhighervaluesthataninstrumentisabletomeasureiscalledAaccuracyBsensitivityCrangeDerror第3题Whendeterminingtheuncertaintyforaparticularmeasurementdevice,thecommonuncertaintyfactorsthatshouldbeincludedareAerrorsinthemeasurementtechniqueandmethodBrandomvariabilityofthemeasurementprocessCtechnician’serrorDallofthese第4题ThebeststandardcharacteristicwhencalibratinganinstrumentforproductioninspectionisAtentimestheaccuracyBnewandseldomusedsincecalibrationCpermanentlyassignedtothisparticularinstrumentDusingastandardsimilarinsize,shape,andmaterial,withpartbeingmeasured第5题Interpretationofrepeatedmeasurementresultsonthesamefeatureisconsideredtheinstrument’sAaccuracyBprecisionCsensitivityDrange第6题AccuracyisdefinedasAameasureofhowoftenanexperimentalvaluecanberepeatedBtheclosenessofameasuredvaluetotherealvalueCthenumberofsignificantfiguresusedinameasurementDnoneofthese第7题Whenaseriesofrepeatedmeasurementsthataremadeonacomponentundersimilarconditionsareplotted,itfollowsAlog-normaldistributionBWeibulldistributionCbinomialdistributionDGaussiandistribution第8题RandomerrorscanbeassessedAexperimentallyBbyperformingsensitivityanalysisCstatisticallyDempirically第9题HysteresisofaninstrumentaffectsitsAresolutionBaccuracyCrepeatabilityDzerostability第10题LoadingeffectmeansAeffectoftheappliedloadontheinstrumentBimpactoftheappliedloadontheaccuracyoftheinstrumentCcapabilityoftheinstrumenttowithstandtheappliedloadDincapabilityoftheinstrumenttomeasurethemeasurandinanundistortedform第11题Whichoneofthefollowingisnotadynamiccharacteristic?ADriftBSpeedofresponseCMeasuringlagDFidelity第12题Manyinstrumentsdonotreproducethesamereadingirrespectiveofwhetherthemeasurementshavebeenobtainedinanascendingoradescendingorder.ThisisduetoAlinearityerrorBdrifterrorCsystematicerrorDhysteresis第13题Fidelityisa/anAstaticcharacterBdynamiccharacterCneitherastaticnoradynamiccharacterDundesirableerror第14题Themaximumdeviationoftheoutputofameasuringsystemfromaspecifiedstraightline,appliedtoaplotofdatapointsonacurveofthemeasuredvaluesversusthemeasuredvaluesiscalledAlinearityBthresholdCmeasurementlagDresolution第15题第16题第17题第18题Theerrorofameasurementisthusdefinedasthedifferencebetweenthe____valueandthe____valueofthequantity.正确答案：:measured正确答案：:truephysical第19题Themeasuredvalueanderrorcanbeknownexactly第20题Andmosterrorscanbeplacedintooneoftwogeneralclasses:____and____正确答案：:biaserrors正确答案：:precisionerrors.第21题____,alsoreferredtoassystematicerrors,areconsistent,repeatableerrors.正确答案：:biaserrors第22题Precisionerrors,alsocalled____,arecausedbyalackofrepeatabilityintheoutputofthemeasuringsystem.正确答案：:randomerrors第23题Typicalcalibrationerrorsmaybe____errors,whichcauseallreadingstobeoffsetbyaconstantamountoffset.or____errorsintheslopeoftheoutputrelativetotheinputwhichcauseallreadingstoerrbyafixedpercentage正确答案：:zero-offset正确答案：:scale第24题Humanerrorsmaywellbesystematicorrandom第25题Illegitimateerrorscanbeeliminatedthroughexerciseofcareorrepetitionofthemeasurement.第26题Readinglowwhilethemeasuredvariableisincreasedandreadinghighwhilethemeasuredvariableisdecreased,whichiscalledas____.正确答案：:hysteresis第27题Accuracyisdefinedas().AameasureofhowoftenanexperimentalvaluecanberepeatedBtheclosenessofameasuredvaluetotherealvalueCthenumberofsignificantfiguresusedinameasurementDnoneofthese第28题Whenaseriesofrepeatedmeasurementsthataremadeonacomponentundersimilarconditionsareplotted,itfollows().Alog-normaldistributionBWeibulldistributionCbinomialdistributionDGaussiandistribution第29题Randomerrorscanbeassessed?b()AexperimentallyBbyperformingsensitivityanalysisCstatisticallyDempirically第30题Hysteresisofaninstrumentaffectsits().AresolutionBaccuracyCrepeatabilityDzerostability第31题Loadingeffectmeans().AeffectoftheappliedloadontheinstrumentBimpactoftheappliedloadontheaccuracyoftheinstrumentCcapabilityoftheinstrumenttowithstandtheappliedloadDincapabilityoftheinstrumenttomeasurethemeasurandinanundistortedform第32题Whichoneofthefollowingisnotadynamiccharacteristic?()ADriftBSpeedofresponseCMeasuringlagDFidelity第33题Manyinstrumentsdonotreproducethesamereadingirrespectiveofwhetherthemeasurementshavebeenobtainedinanascendingoradescendingorder.Thisisdueto().AlinearityerrorBdrifterrorCsystematicerrorDhysteresis第34题Fidelityisa/an().AstaticcharacterBdynamiccharacterCneitherastaticnoradynamiccharacterDundesirableerror第35题Themaximumdeviationoftheoutputofameasuringsystemfromaspecifiedstraightline,appliedtoaplotofdatapointsonacurveofthemeasuredvaluesversusthemeasuredvaluesiscalled().AlinearityBthresholdCmeasurementlagDresolutionExercise第1题Thesignaldefinedbytheequationsf(t)=0fort<0,f(t)=Efor0≤t≤aandf(t)=0fort>ais().AastepfunctionBapulsefunctionCashiftedstepfunctionoriginatingatt=aDnoneoftheabove第2题Theperiodofthefunctioncosπ/4(t-1)is().A1/8sB8sC4sD1/4s第3题TheFourierSeriesofanoddperiodicfunction,containsonly().AOddharmonicsBevenharmonicsCcosinetermsDsineterms第4题TheTrigonometricFourierSeriesofaperiodictimefunctioncanhaveonly().AcosinetermsBsinetermsCcosine&sinetermsDDC&cosineterms第5题Afunctionhavingfrequencyfistobesampled.ThesamplingtimeTshouldbe().A1/2fB>1/2fC<1/2fD≤1/2f第6题TheF.T.ofaconjugatesymmetricfunctionisalways().AImaginaryBRealCconjugateUnsymmetricDconjugatesymmetric第7题WhichofthefollowingcannotbetheFourierSeriesexpansionofaperiodicsignal().Ax(t)=2cost+3cos3tBx(t)=2cosπt+7costCx(t)=cost+0.5Dx(t)=2cos1.5πt+sin3.5πt第8题Whichofthefollowingis/arenotaproperty/propertiespowerspectraldensityfunctionSx(ω)?()ASx(ω)isrealfunctionofωBSx(ω)isaevenfunctionofωCSx(ω)isnon-positivefunctionofωSx(ω)≤0forallωDAlloftheabove第9题Theanalogsignalgivenbelowissampledby600samplespersecondform(t)=3sin500πt+2sin700πtthenfoldingfrequencyis().A500HzB300HzC700HzD1400Hz第10题signalm(t)ismultipliedbyasinusoidalwaveformoffrequencyfcsuchthatv(t)=m(t)cos2πfct.IfFouriertransformofm(t)isM(f),Fouriertransformofv(t)willbe().A0.5M(f+fc)B0.5M(f-fc)C0.5M(f+fc)+0.5M(f-fc)D0.5M(f-fc)+0.5M(f-fc)第11题Theanalogsignalm(t)isgivenbelowm(t)=4cos100πt+8sin200πt+cos300πt,theNyquistsamplingratewillbe().A1/100B1/200C1/300D1/400第12题IfH(f)=y(t)/x(t)thenforthistobetruex(t)is().Aexp(j2πf/t)Bexp(-j2πf/t)Cexp(j2πft)Dexp(-j2πf/t)第13题Whichofthefollowingsignalsis/areperiodic?()As(t)=cos2t+cos3t+cos5tBs(t)=exp(j8πt)Cs(t)=exp(-7t)sin10πtDs(t)=cos2tcos4t正确答案：ABD第14题stepsignalispassedthroughintegratorthenoutputwillbe____.正确答案：:rampsignal第15题Areaundertheimpulsesignalis____.正确答案：:1第16题impulsesignalispassedthroughtheintegratorthenoutputwillbe____.正确答案：:stepsignal第17题TheinverseFouriertransformofδ(t)is____.正确答案：:1第18题TheTrigonometricFourierSeriesofaperiodictimefunctioncanhaveonlyAcosinetermsBsinetermsCcosine&sinetermsDDC&cosineterms第19题Afunctionhavingfrequencyfistobesampled.ThesamplingtimeTshouldbeA1/2fB>1/2fC<1/2fD≤1/2f第20题第21题Ifpressure-timefunctionis𝑃=100sin80𝑡+50cos(160𝑡−π∕4),thenthefundamentalfrequencyis____,amplitudesofthefundamentalandsecondorderare____and____.正确答案：:80rad/sor12.7Hz正确答案：:100正确答案：:50第22题ThefrequenciesoftheDFTarespacedinincrementsof∆𝑓=____正确答案：:1/(NΔt)=f_s/N第23题Thewaytoavoidfrequencyaliasinganddistortionofthesampledsignalcanbe____.正确答案：:fs>2fmax第24题WhichofthefollowingcannotbetheFourierSeriesexpansionofaperiodicsignalAx(t)=2cost+3cos3tBx(t)=2cosπt+7costCx(t)=cost+0.5Dx(t)=2cos1.5πt+sin3.5πt第25题Whichofthefollowingis/arenotaproperty/propertiespowerspectraldensityfunctionSx(ω)?ASx(ω)isrealfunctionofωBSx(ω)isaevenfunctionofωCSx(ω)isnon-positivefunctionofωSx(ω)≤0forallωDAlloftheabove第26题Whichofthefollowingsignalsis/areperiodic?As(t)=cos2t+cos3t+cos5tBs(t)=exp(j8πt)Cs(t)=exp(-7t)sin10πtDs(t)=cos2tcos4t正确答案：ABD第27题Theanalogsignalgivenbelowissampledby600samplespersecondform(t)=3sin500πt+2sin700πtthenfoldingfrequencyisA500HzB300HzC700HzD1400Hz第28题signalm(t)ismultipliedbyasinusoidalwaveformoffrequencyfcsuchthatv(t)=m(t)cos2πfct.IfFouriertransformofm(t)isM(f),Fouriertransformofv(t)willbeA0.5M(f+fc)B0.5M(f-fc)C0.5M(f+fc)+0.5M(f-fc)D0.5M(f-fc)+0.5M(f-fc)第29题Theanalogsignalm(t)isgivenbelowm(t)=4cos100πt+8sin200πt+cos300πt,theNyquistsamplingratewillbeA1/100B1/200C1/300D1/400第30题Ifthenforthistobetruex(t)isAexp(j2πf/t)Bexp(-j2πf/t)Cexp(j2πft)Dexp(-j2πf/t)第31题Samplethesignalx(t)=sin(2π•500•t)withsamplingfrequencyfs=4096HzandtotalnumberofsamplingpointsN=2048.theNyquistfrequencyis____Hz,thefrequencyresolutionis____Hz.正确答案：:1000正确答案：:2第32题Samplethesignalx(t)=sin(2πt)+sin(6πt)+sin(10πt),thelowestsamplingfrequencyshouldbe____Hzandandminiumsamplingpointsshouldbe____.正确答案：:20正确答案：:10第33题StepsforAccurateDiscreteSamplingincludes____,____,____.正确答案：:Choosethesampleratefsgreaterthantwiceofthehighestfrequencyinthesignal正确答案：:Usealow-passfilterasanti-aliasingfilter正确答案：:ChoosethenumberofpointsN>fs/fmin第34题AsquarewavewithamplituideAandcycleT,itsfourierseriesexpansionis____.正确答案：:x(t)=4A/π∑(sin(2n-1)2πft)/(2n-1)Exercise第1题Thebehaviourofaninstrumentundervaryingconditionsofinputwithtimeisknownas().AloadingeffectBhysteresisCdynamicresponseDlinearity第2题Deadtimeisthetimerequiredbyameasuringsystemto().ArespondtoachangeinthequantitytobemeasuredBeliminateloadingerrorCovercomezerodriftDincreasethethresholdvalue第3题Thresholdvaluecorrespondstotheminimumvalueofaninputrequiredto().AreducedynamicerrorBdetectanoutputCincreasedriftDreducedeadtime第4题Foralinearsystem,sensitivityrepresentstheslopeofthetransferfunction.第5题Theresolution,R,isdefinedasthesmallestintervaloftheoutputthatcanbeobserved.第6题StaticSystemResponseinclude____,____,____.正确答案：:Sensitivity正确答案：:resolution正确答案：:RangeandSpan第7题Iftemperatureismeasured,ataratedtemperatureof50C,theoutputmightbe4.95Vwhentemperatureincrease,but5.05Vwhentemperaturedecreases,thehysteresisis____.正确答案：:0.01第8题Equationsareusedtodescribetherelationshipbetweentheinputandoutputofasystemcanbe____,____,____,____.正确答案：:differentialequation正确答案：:Transferfunction正确答案：:Frequencyresponse正确答案：:Impulseresponse第9题Transferfunction,H(s),ofasystemisdefinedastheratiooftheLaplaseTransform(LT)oftheoutputvariable,Y(s),totheLToftheinputvariable,X(s),with____.正确答案：:alltheinitialconditionsareassumedtobezero第10题LaplaceTransformofδ(t)is____.正确答案：:1第11题Amplitudefrequencyresponseofasystemisshownasthefigure,frequencybandwidthis____.正确答案：:16.43kHz第12题Tworequirmentstoachieveafidelitymeasurementare____,____.正确答案：:Amplitudefrequencyresponseisconstant正确答案：:Phasefrequencyresponseispropotional第13题A5-kgmassisstaticallysuspendedfromaload(force)cellandtheloadcelldeflectioncausedbythismassis0.01mm.Thenaturalfrequencyoftheloadcellis____.正确答案：:990Hz第14题Foradynamicsystem,systemresponsecanexpressedas____,____，____.正确答案：:transmissioncharacteristics正确答案：:frequencyresponse正确答案：:differentialequations第15题Autocorrelationfunctionofperiodicsignalisstillperiodicsignalwiththesamefrequency.第16题randomsignalcanbecalssifiedas____and____.正确答案：:stationary正确答案：:nonstationary第17题Stationaryrandomprocessesmaybefurthercategorizedasbeingeither____or____.正确答案：:ergodic正确答案：:nonergodic第18题f(t)*δ(t）=____.正确答案：:f(t)第19题Thefouriertransformofunitimpulseδ(t)is____.正确答案：:1第20题ifthefouriertransformofx(t)isX(f),thenthefouriertransformofx(kt)is____.正确答案：:X(f/k)第21题ifthefouriertransformofx1(t)andx2(t)isX1(f)andX2(f),thenthefouriertransformofx1(t)x2(t)is____.正确答案：:X1(f)*X2(f)第22题Featuresofperiodicsignalspectruminclude:____,____,____.正确答案：:discrete正确答案：:harmonic正确答案：:convergence第23题Periodicsignaliscomposedwithinfinitiveharmonicperiodicsignals第24题ThebehaviourofaninstrumentundervaryingconditionsofinputwithtimeisknownasAloadingeffectBhysteresisCdynamicresponseDlinearity第25题DeadtimeisthetimerequiredbyameasuringsystemtoArespondtoachangeinthequantitytobemeasuredBeliminateloadingerrorCovercomezerodriftDincreasethethresholdvalue第26题ThresholdvaluecorrespondstotheminimumvalueofaninputrequiredtoAreducedynamicerrorBdetectanoutputCincreasedriftDreducedeadtime第27题StaticSystemResponseinclude____,____,____.____,____.正确答案：:Sensitivity正确答案：:resolution正确答案：:RangeandSpan正确答案：:threshold正确答案：:deadband第28题第29题AsimplepassiveLRClow-passfilterisshownasfigure,thedifferentialequationofthissystemis____,thenaturefrequencyis____.正确答案：:图片1正确答案：:图片2Exercise第1题Straingaugemeasuresstrainbasedonchangesof().AcapacitanceBresistanceCinductanceDlength第2题Aninfraredthermometerisa()sensor.AcontactBnon-contactsensorCpassiveDactive正确答案：BC第3题Astraingaugeisa()sensor.AcontactBnon-contactsensorCabsoluteDrelative正确答案：AC第4题Parallelplatecapacitorcanbeusedasasensorbyvarying().AgapBcapacitiveareaCdielectricityDtemperature正确答案：ABC第5题Thesematerials()arepiezoelectricmaterials.AquartzBcanesugarCsilicaDsilicon正确答案：AB第6题Thermocouplemeasuresthetemperaturedifference,soitisanactivesensor.第7题Inductivesensorsarenormallypassivesensors.第8题Normally,semiconductorstraingaugesaretemperaturesensitive.第9题FrequencyofthesourcemustbelowwithrespecttothefrequencyofmotionofthecoretoavoiderrorsintheoutputvoltageduetoslowresponseoftheLVDT.第10题Capacitivefuelgagesarebasedonthechangeofdielectricityofacoaxialcapacitor.第11题Appearanceofanelectricpotentialacrosscertainfacesofacrystalwhenitissubjectedtomechanicalpressureiscalledpiezoelectriceffect,onthecontrary,itiscalledinversepiezoelectriceffect.第12题Asensorthatrequiresexternalpowertooperateisa____sensor,whilethatgeneratesitsownelectricsignalanddoesnotrequireapowersourceisan____sensor.正确答案：:passive正确答案：:active第13题Theunitofstrainis____.正确答案：:1第14题Constantanisanormallyusedmaterialforstraingauge,andithasa____percentofCuand____percentofNiinweight.正确答案：:0.6正确答案：:0.4第15题ALVDTneedsoneprimarycoil,andtwosecondarycoilsconnectedin____.正确答案：:opposition第16题Asensorthatrequiresexternalpowertooperateisa____sensor,whilethatgeneratesitsownelectricsignalanddoesnotrequireapowersourceisan____sensor.正确答案：:passive正确答案：:active第17题Constantanisanormallyusedmaterialforstraingauge,andithasa____percentofCuand____percentofNiinweight.正确答案：:0.6正确答案：:0.4第18题Asensorrequiressignaltransformationfrom____quantityto____quantity.正确答案：:physical正确答案：:elelctrical第19题Physicalstimulusisthequantitythatissensed,sometimescalledthe____.正确答案：:measurand第20题Basicstructuresofsensorsare____,____,and____arrangment.正确答案：:directorseries正确答案：:differentialorparallel正确答案：:balancingorfeedback第21题Themaindevelopingtrendsofsensorsare____,____,and____.正确答案：:integration正确答案：:intelligence正确答案：:imagination第22题Thesensorbasedonangular-motionvariableresistancehasanonlinearinput-outputrelationsincethemotionisnotlinear.第23题Theresistancesensorbasedontheslidingconductdeviceissimpleandcheap,buttheoutputisnoisywhentheslidermoves.第24题Straincanberelatedto().AstressBforceCtorqueDacceleration正确答案：ABCD第25题Thegaugefactorofmaterialsareallpositive.第26题Themostcommontypeofstimulisensedbyinductivesensorsare______,______and______.()ApositionorproximityBdisplacementCmaterialcompositionDcurrents正确答案：ABC第27题RVDTisavariationoftheLVDT,whichisintendedfor____and____.正确答案：:angulardisplacement正确答案：:rotarypositionsensing第28题Anytwoconductingbodies,regardlessofsizeanddistancebetweenthemhaveacapacitance.第29题Thesensitivitycanbeincreasedandthenonlinearitycanbereducedbyusingdifferentialcapacitancesensors.第30题Theaccelerometersbasedonthepiezoelectrictransducercanbeusedtomeasurestaticacceleration.Exercise第1题Whatcanthesignalconditioningdo?()AConvertchangesofmeasuredparameterstovoltagechangesBSubtractoffsetvoltageCIncreasesignalvoltageDRemoveunwantedfrequencycomponent正确答案：ABCD第2题Filterscanbeclassifiedas().AlowpassBhighpassCbandpassDbandbarrier正确答案：ABCD第3题Thisbridge,especiallywithresistivebranchesisthecommonmethodofinterfacingwith().AstraingaugesBpiezoresistivesensorsChallelementsDthermistors正确答案：ABCD第4题OnlyamplitudeconditionisrequiredforACbridge.第5题Thetemperatureinducederrorinasensorcanbecompensatedbyusingabridgecircuit.第6题Anamplifierisadevicethatonlyamplifiesavoltagesignal.第7题Amplifierscanalsobeusedforimpedancematchingpurposesevenwhennoamplificationisneeded.第8题Forabandpassfilter,thequalityfactoristheratioofthecenterfrequencyofthebandpassovertheentirebandpassregionfromthelowertouppercutofffrequencies.第9题Thesensitivityoffullar