雨课堂学堂在线学堂云《Modern Measurement Technology( 理大)》单元测试考核答案

注：不含主观题第1题判断题(1分)Ameasurementvalueisbetterthannothing.第2题判断题(1分)Thereisnoperfectanswer,noperfectmeasure.第3题判断题(1分)Majorityoftransducersinuseconvertthemechanicalinputintoananalogouselectricalform.第4题判断题(1分)Single-pointcalibrationworkswhentheoutputisnotsimplyproportional.第5题填空题(1分)Theprocessortheactofmeasurementconsistsofobtainingaquantitativecomparisonbetweena____andameasurand.正确答案：:["predefinedstandard"]第6题填空题(7分)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题填空题(2分)FoundmentalMethodsofMeasurementare____,____.正确答案：:["directcomparison"]正确答案：:["indirectcomparison"]第8题填空题(3分)Mostmeasuringsystemsfallwithintheframeworkofageneralarrangementconsistingofthreephasesorstages:____stage,____stage,____stage.正确答案：:["sensor-transducer"]正确答案：:["signal-conditioning"]正确答案：:["readout-recording"]第9题填空题(1分)An____canincreaseeitheramplitudeorpowerofthesignal,orboth,tothelevelrequiredtodrivethefinalterminatingdevice.正确答案：:["amplifier"]第10题填空题(1分)Anacceleration-timesignalcanbetransferredtoavelocity-timerelationbyan____.正确答案：:["integrator"]第11题填空题(2分)Therearetwokindsofnonrepetitiveortransientsignal:____,____.正确答案：:["Singlepulseoraperiodic"]正确答案：:["Continuingorrandom"]第12题填空题(1分)____procedurecanhelptoestablishesthecorrectoutputscaleforthemeasuringsystem.正确答案：:["calibration"]第13题填空题(1分)Theprocessortheactofmeasurementconsistsofobtainingaquantitativecomparisonbetweena____andameasurand.正确答案：:["predefinedstandard"]第14题填空题(1分)Theprocessortheactofmeasurementconsistsof____betweenapredefinedstandardandameasurand.正确答案：:["obtainingaquantitativecomparison"]第15题填空题(1分)Thewordmeasurandisusedtodesignatetheparticular____beingobservedandquanlified;thatis,theinputquantitytothemeasuringprocess.正确答案：:["particularphysicalparameter"]第16题填空题(2分)Thestandardofcomparisonmustbeofthesame____asthemeasurand,andusually,butnotalways,isprescribedanddefinedbya____.正确答案：:["character"]正确答案：:["legalorrecognizedagencyororganization"]第17题填空题(4分)Namethreestandardizationorganizationsyouknow,____,____,____.____.正确答案：:["ISO"]正确答案：:["CNIS"]正确答案：:["NIST"]正确答案：:["ANSI"]第18题填空题(7分)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题填空题(2分)Tobeuseful,measurementmustbe____and____.正确答案：:["reliable"]正确答案：:["valid"]第20题填空题(1分)____

referstotheconsistencyofameasure.正确答案：:["Reliability/Precision"]第21题填空题(1分)____

istheextenttowhichthescoresfromameasurerepresentthevariabletheyareintendedto.正确答案：:["Validity/accuracy"]第22题填空题(2分)FoundmentalMethodsofMeasurementare____,____正确答案：:["directcomparison"]正确答案：:["indirectcomparison"]第23题填空题(1分)Lengthmeasurementusingatapeisa____comparison正确答案：:["direct"]第24题填空题(1分)sensor-transducerstageshouldbe____toeveryotherpossibleinput正确答案：:["insensitive"]第25题填空题(2分)Unwantedsensitivityisameasuringerror,called____whenitvariesrapidlyand____whenitvariesveryslowly.正确答案：:["noise"]正确答案：:["drift"]第26题填空题(5分)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题填空题(2分)Thereadout-recordingstagepresentedinoneofthefollowingformsl:____,____正确答案：:["arelativedisplacement"]正确答案：:["digitalform"]第28题填空题(4分)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题填空题(2分)Mechanicalquantities,inadditiontotheirinherentdefiningcharacteristics,maybeclassifiedas____,____正确答案：:["static"]正确答案：:["dynamic"]第30题填空题(2分)Therearetwokindsofnonrepetitiveortransientsignal:____,____正确答案：:["Singlepulseoraperiodic"]正确答案：:["Continuingorrandom"]Exercise第1题单选题(1分)Themodernmetreis().Athelengthofthepathtravelledbylightinvacuumduringatimeintervalof1/29,97,92,458ofasecondB16,50,763.73×wavelengthsofthered–orangeradiationofakrypton86atominvacuumCthelengthofthepathtravelledbylightinvacuumduringatimeintervalof1/399,792,458ofasecondD1,660,793.73×wavelengthsoftheredorangeradiationofakrypton86atominvacuum第2题单选题(1分)Theaimofcalibrationisto().AmeetcustomerrequirementBdetectdeteriorationofaccuracyCcomplywithISO9000standardrequirementsDpractisemeasurementprocedures第3题单选题(1分)Conformityofaphysicalquantitytothenationalstandardofmeasurementisknownas().AcalibrationBtraceabilityCsensitivityDrepeatability第4题判断题(1分)Thedimensionalunitisthebasisforquantificationoftheentity.第5题判断题(1分)ThepermanentofficeofTheOrganisationInternationaleDEMetrologieLegale-OIMLisBIPM,basedinParis,France.第6题判断题(1分)RankineistheSIunitfortemperature.第7题判断题(1分)Alltheseconddimensionsandunitscanbederivedascombinationsofprimarydimensions.第8题判断题(1分)Aphysicalstandardisanartifact.第9题判断题(1分)Thenumberofrelevantorusefuldigitsinameasurementshouldberestricted.第10题判断题(1分)4.00×10^3has4significantdigits.第11题填空题(2分)Therearetwoprimaryunitsystemsinusetoday:____,____.正确答案：:["theInternationalSystemofUnits"]正确答案：:["theEnglishEngineeringSystemofUnits"]第12题填空题(7分)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题填空题(1分)Thereviseddefinitionsisbasedonseven____.正确答案：:["physicalconstants"]第14题第15题填空题(1分)Becausedifferentsystemsofunitsexist,themethodof____fromsystemtosystemmustbemutuallyagreedupon.正确答案：:["conversion"]第16题填空题(1分)ifthecalibrationistobemeaningful,theknowninputmustitselfbederivedfroma____.正确答案：:["definedstandard"]第17题填空题(1分)Single-pointcalibrationcanbeusedwhentheoutputis____totheinput.正确答案：:["proportional"]第18题填空题(1分)____calibrationsareusedtoimprovestheaccuracyofthecalibration正确答案：:["multipoint"]第19题填空题(2分)Theunitsystem,meansnotonlytheestablishmentof____,butalsotheagreementonthe____.正确答案：:["unitstandard"]正确答案：:["basisforconversion"]第20题判断题(1分)Thedimensionalunitisthebasisforquantificationoftheentity第21题填空题(2分)Therearetwoprimaryunitsystemsinusetoday:____,____正确答案：:["theInternationalSystemofUnits"]正确答案：:["theEnglishEngineeringSystemofUnits"]第22题判断题(1分)TheInternationalSystemofUnits,SIsystemwasaproductoftheFrenchRevolution.第23题填空题(2分)1971,the14thconferenceaddedthe____astheunitforamountof____,completingthesevendimensionalsysteminusetoday.正确答案：:["mole"]正确答案：:["substance"]第24题判断题(1分)ThepermanentofficeofTheOrganisationInternationaleDEMetrologieLegale-OIMLisBIPM,basedinParis,France第25题判断题(1分)RankineistheSIunitfortemperature第26题判断题(1分)Allotherdimensionsandunitscanbederivedascombinationsofthesesevendimensions.第27题单选题(1分)Astandardcanbe().Aanartifact(prototype)BanaturalphenomenonCastandardizedprocedureofmeasurementusingstandardizedmeasurementmethodsandequipmentDAboveall第28题填空题(1分)The____standardispreservedunderthemostcarefulconditionsandimprovedinanationalinstituteofstandardsandtechnology.正确答案：:["primary"]第29题填空题(2分)The____standardiscomparedatregularintervalswithprimaryStandsandrecordstheir____.正确答案：:["secondary"]正确答案：:["deviation"]第30题单选题(1分)Themodernmetreis______.Athelengthofthepathtravelledbylightinvacuumduringatimeintervalof1/29,97,92,458ofasecondB16,50,763.73×wavelengthsofthered–orangeradiationofakrypton86atominvacuumCthelengthofthepathtravelledbylightinvacuumduringatimeintervalof1/399,792,458ofasecondD1,660,793.73×wavelengthsoftheredorangeradiationofakrypton86atominvacuum第31题单选题(1分)TheaimofcalibrationistoAmeetcustomerrequirementBdetectdeteriorationofaccuracyCcomplywithISO9000standardrequirementsDpractisemeasurementprocedures第32题单选题(1分)ConformityofaphysicalquantitytothenationalstandardofmeasurementisknownasAcalibrationBtraceabilityCsensitivityDrepeatabilityExercise第1题单选题(1分)Whenasetofreadingsofameasurementhasawiderange,itindicatesAhighprecisionBhighaccuracyClowprecisionDlowaccuracy第2题单选题(1分)ThedifferencebetweenthelowerandhighervaluesthataninstrumentisabletomeasureiscalledAaccuracyBsensitivityCrangeDerror第3题单选题(1分)Whendeterminingtheuncertaintyforaparticularmeasurementdevice,thecommonuncertaintyfactorsthatshouldbeincludedareAerrorsinthemeasurementtechniqueandmethodBrandomvariabilityofthemeasurementprocessCtechnician’serrorDallofthese第4题单选题(1分)ThebeststandardcharacteristicwhencalibratinganinstrumentforproductioninspectionisAtentimestheaccuracyBnewandseldomusedsincecalibrationCpermanentlyassignedtothisparticularinstrumentDusingastandardsimilarinsize,shape,andmaterial,withpartbeingmeasured第5题单选题(1分)Interpretationofrepeatedmeasurementresultsonthesamefeatureisconsideredtheinstrument’sAaccuracyBprecisionCsensitivityDrange第6题单选题(1分)AccuracyisdefinedasAameasureofhowoftenanexperimentalvaluecanberepeatedBtheclosenessofameasuredvaluetotherealvalueCthenumberofsignificantfiguresusedinameasurementDnoneofthese第7题单选题(1分)Whenaseriesofrepeatedmeasurementsthataremadeonacomponentundersimilarconditionsareplotted,itfollowsAlog-normaldistributionBWeibulldistributionCbinomialdistributionDGaussiandistribution第8题单选题(1分)RandomerrorscanbeassessedAexperimentallyBbyperformingsensitivityanalysisCstatisticallyDempirically第9题单选题(1分)HysteresisofaninstrumentaffectsitsAresolutionBaccuracyCrepeatabilityDzerostability第10题单选题(1分)LoadingeffectmeansAeffectoftheappliedloadontheinstrumentBimpactoftheappliedloadontheaccuracyoftheinstrumentCcapabilityoftheinstrumenttowithstandtheappliedloadDincapabilityoftheinstrumenttomeasurethemeasurandinanundistortedform第11题单选题(1分)Whichoneofthefollowingisnotadynamiccharacteristic?ADriftBSpeedofresponseCMeasuringlagDFidelity第12题单选题(1分)Manyinstrumentsdonotreproducethesamereadingirrespectiveofwhetherthemeasurementshavebeenobtainedinanascendingoradescendingorder.ThisisduetoAlinearityerrorBdrifterrorCsystematicerrorDhysteresis第13题单选题(1分)Fidelityisa/anAstaticcharacterBdynamiccharacterCneitherastaticnoradynamiccharacterDundesirableerror第14题单选题(1分)Themaximumdeviationoftheoutputofameasuringsystemfromaspecifiedstraightline,appliedtoaplotofdatapointsonacurveofthemeasuredvaluesversusthemeasuredvaluesiscalledAlinearityBthresholdCmeasurementlagDresolution第15题第16题第17题第18题填空题(2分)Theerrorofameasurementisthusdefinedasthedifferencebetweenthe____valueandthe____valueofthequantity.正确答案：:["measured"]正确答案：:["truephysical"]第19题判断题(1分)Themeasuredvalueanderrorcanbeknownexactly第20题填空题(2分)Andmosterrorscanbeplacedintooneoftwogeneralclasses:____and____正确答案：:["biaserrors"]正确答案：:["precisionerrors."]第21题填空题(1分)____,alsoreferredtoassystematicerrors,areconsistent,repeatableerrors.正确答案：:["biaserrors"]第22题填空题(1分)Precisionerrors,alsocalled____,arecausedbyalackofrepeatabilityintheoutputofthemeasuringsystem.正确答案：:["randomerrors"]第23题填空题(2分)Typicalcalibrationerrorsmaybe____errors,whichcauseallreadingstobeoffsetbyaconstantamountoffset.or____errorsintheslopeoftheoutputrelativetotheinputwhichcauseallreadingstoerrbyafixedpercentage正确答案：:["zero-offset"]正确答案：:["scale"]第24题判断题(1分)Humanerrorsmaywellbesystematicorrandom第25题判断题(1分)Illegitimateerrorscanbeeliminatedthroughexerciseofcareorrepetitionofthemeasurement.第26题填空题(1分)Readinglowwhilethemeasuredvariableisincreasedandreadinghighwhilethemeasuredvariableisdecreased,whichiscalledas____.正确答案：:["hysteresis"]第27题单选题(1分)Accuracyisdefinedas().AameasureofhowoftenanexperimentalvaluecanberepeatedBtheclosenessofameasuredvaluetotherealvalueCthenumberofsignificantfiguresusedinameasurementDnoneofthese第28题单选题(1分)Whenaseriesofrepeatedmeasurementsthataremadeonacomponentundersimilarconditionsareplotted,itfollows().Alog-normaldistributionBWeibulldistributionCbinomialdistributionDGaussiandistribution第29题单选题(1分)Randomerrorscanbeassessed?b()AexperimentallyBbyperformingsensitivityanalysisCstatisticallyDempirically第30题单选题(1分)Hysteresisofaninstrumentaffectsits().AresolutionBaccuracyCrepeatabilityDzerostability第31题单选题(1分)Loadingeffectmeans().AeffectoftheappliedloadontheinstrumentBimpactoftheappliedloadontheaccuracyoftheinstrumentCcapabilityoftheinstrumenttowithstandtheappliedloadDincapabilityoftheinstrumenttomeasurethemeasurandinanundistortedform第32题单选题(1分)Whichoneofthefollowingisnotadynamiccharacteristic?()ADriftBSpeedofresponseCMeasuringlagDFidelity第33题单选题(1分)Manyinstrumentsdonotreproducethesamereadingirrespectiveofwhetherthemeasurementshavebeenobtainedinanascendingoradescendingorder.Thisisdueto().AlinearityerrorBdrifterrorCsystematicerrorDhysteresis第34题单选题(1分)Fidelityisa/an().AstaticcharacterBdynamiccharacterCneitherastaticnoradynamiccharacterDundesirableerror第35题单选题(1分)Themaximumdeviationoftheoutputofameasuringsystemfromaspecifiedstraightline,appliedtoaplotofdatapointsonacurveofthemeasuredvaluesversusthemeasuredvaluesiscalled().AlinearityBthresholdCmeasurementlagDresolutionExercise第1题单选题(1分)Thesignaldefinedbytheequationsf(t)=0fort<0,f(t)=Efor0≤t≤aandf(t)=0fort>ais().AastepfunctionBapulsefunctionCashiftedstepfunctionoriginatingatt=aDnoneoftheabove第2题单选题(1分)Theperiodofthefunctioncosπ/4(t-1)is().A1/8sB8sC4sD1/4s第3题单选题(1分)TheFourierSeriesofanoddperiodicfunction,containsonly().AOddharmonicsBevenharmonicsCcosinetermsDsineterms第4题单选题(1分)TheTrigonometricFourierSeriesofaperiodictimefunctioncanhaveonly().AcosinetermsBsinetermsCcosine&sinetermsDDC&cosineterms第5题单选题(1分)Afunctionhavingfrequencyfistobesampled.ThesamplingtimeTshouldbe().A1/2fB>1/2fC<1/2fD≤1/2f第6题单选题(1分)TheF.T.ofaconjugatesymmetricfunctionisalways().AImaginaryBRealCconjugateUnsymmetricDconjugatesymmetric第7题单选题(1分)WhichofthefollowingcannotbetheFourierSeriesexpansionofaperiodicsignal().Ax(t)=2cost+3cos3tBx(t)=2cosπt+7costCx(t)=cost+0.5Dx(t)=2cos1.5πt+sin3.5πt第8题单选题(1分)Whichofthefollowingis/arenotaproperty/propertiespowerspectraldensityfunctionSx(ω)?()ASx(ω)isrealfunctionofωBSx(ω)isaevenfunctionofωCSx(ω)isnon-positivefunctionofωSx(ω)≤0forallωDAlloftheabove第9题单选题(1分)Theanalogsignalgivenbelowissampledby600samplespersecondform(t)=3sin500πt+2sin700πtthenfoldingfrequencyis().A500HzB300HzC700HzD1400Hz第10题单选题(1分)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题单选题(1分)Theanalogsignalm(t)isgivenbelowm(t)=4cos100πt+8sin200πt+cos300πt,theNyquistsamplingratewillbe().A1/100B1/200C1/300D1/400第12题单选题(1分)IfH(f)=y(t)/x(t)thenforthistobetruex(t)is().Aexp(j2πf/t)Bexp(-j2πf/t)Cexp(j2πft)Dexp(-j2πf/t)第13题多选题(2分)Whichofthefollowingsignalsis/areperiodic?()As(t)=cos2t+cos3t+cos5tBs(t)=exp(j8πt)Cs(t)=exp(-7t)sin10πtDs(t)=cos2tcos4t正确答案：ABD第14题填空题(1分)stepsignalispassedthroughintegratorthenoutputwillbe____.正确答案：:["rampsignal"]第15题填空题(1分)Areaundertheimpulsesignalis____.正确答案：:["1"]第16题填空题(1分)impulsesignalispassedthroughtheintegratorthenoutputwillbe____.正确答案：:["stepsignal"]第17题填空题(1分)TheinverseFouriertransformofδ(t)is____.正确答案：:["1"]第18题单选题(1分)TheTrigonometricFourierSeriesofaperiodictimefunctioncanhaveonlyAcosinetermsBsinetermsCcosine&sinetermsDDC&cosineterms第19题单选题(1分)Afunctionhavingfrequencyfistobesampled.ThesamplingtimeTshouldbeA1/2fB>1/2fC<1/2fD≤1/2f第20题第21题填空题(3分)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题填空题(1分)ThefrequenciesoftheDFTarespacedinincrementsof∆𝑓=____正确答案：:["1/(NΔt)=f_s/N"]第23题填空题(1分)Thewaytoavoidfrequencyaliasinganddistortionofthesampledsignalcanbe____.正确答案：:["fs>2fmax"]第24题单选题(1分)WhichofthefollowingcannotbetheFourierSeriesexpansionofaperiodicsignalAx(t)=2cost+3cos3tBx(t)=2cosπt+7costCx(t)=cost+0.5Dx(t)=2cos1.5πt+sin3.5πt第25题单选题(1分)Whichofthefollowingis/arenotaproperty/propertiespowerspectraldensityfunctionSx(ω)?ASx(ω)isrealfunctionofωBSx(ω)isaevenfunctionofωCSx(ω)isnon-positivefunctionofωSx(ω)≤0forallωDAlloftheabove第26题多选题(2分)Whichofthefollowingsignalsis/areperiodic?As(t)=cos2t+cos3t+cos5tBs(t)=exp(j8πt)Cs(t)=exp(-7t)sin10πtDs(t)=cos2tcos4t正确答案：ABD第27题单选题(1分)Theanalogsignalgivenbelowissampledby600samplespersecondform(t)=3sin500πt+2sin700πtthenfoldingfrequencyisA500HzB300HzC700HzD1400Hz第28题单选题(1分)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题单选题(1分)Theanalogsignalm(t)isgivenbelowm(t)=4cos100πt+8sin200πt+cos300πt,theNyquistsamplingratewillbeA1/100B1/200C1/300D1/400第30题单选题(1分)Ifthenforthistobetruex(t)isAexp(j2πf/t)Bexp(-j2πf/t)Cexp(j2πft)Dexp(-j2πf/t)第31题填空题(2分)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题填空题(2分)Samplethesignalx(t)=sin(2πt)+sin(6πt)+sin(10πt),thelowestsamplingfrequencyshouldbe____Hzandandminiumsamplingpointsshouldbe____.正确答案：:["20"]正确答案：:["10"]第33题填空题(3分)StepsforAccurateDiscreteSamplingincludes____,____,____.正确答案：:["Choosethesampleratefsgreaterthantwiceofthehighestfrequencyinthesignal"]正确答案：:["Usealow-passfilterasanti-aliasingfilter"]正确答案：:["ChoosethenumberofpointsN>fs/fmin"]第34题填空题(1分)AsquarewavewithamplituideAandcycleT,itsfourierseriesexpansionis____.正确答案：:["x(t)=4A/π∑(sin(2n-1)2πft)/(2n-1)"]Exercise第1题单选题(1分)Thebehaviourofaninstrumentundervaryingconditionsofinputwithtimeisknownas().AloadingeffectBhysteresisCdynamicresponseDlinearity第2题单选题(1分)Deadtimeisthetimerequiredbyameasuringsystemto().ArespondtoachangeinthequantitytobemeasuredBeliminateloadingerrorCovercomezerodriftDincreasethethresholdvalue第3题单选题(1分)Thresholdvaluecorrespondstotheminimumvalueofaninputrequiredto().AreducedynamicerrorBdetectanoutputCincreasedriftDreducedeadtime第4题判断题(1分)Foralinearsystem,sensitivityrepresentstheslopeofthetransferfunction.第5题判断题(1分)Theresolution,R,isdefinedasthesmallestintervaloftheoutputthatcanbeobserved.第6题填空题(3分)StaticSystemResponseinclude____,____,____.正确答案：:["Sensitivity"]正确答案：:["resolution"]正确答案：:["RangeandSpan"]第7题填空题(1分)Iftemperatureismeasured,ataratedtemperatureof50C,theoutputmightbe4.95Vwhentemperatureincrease,but5.05Vwhentemperaturedecreases,thehysteresisis____.正确答案：:["0.01"]第8题填空题(4分)Equationsareusedtodescribetherelationshipbetweentheinputandoutputofasystemcanbe____,____,____,____.正确答案：:["differentialequation"]正确答案：:["Transferfunction"]正确答案：:["Frequencyresponse"]正确答案：:["Impulseresponse"]第9题填空题(1分)Transferfunction,H(s),ofasystemisdefinedastheratiooftheLaplaseTransform(LT)oftheoutputvariable,Y(s),totheLToftheinputvariable,X(s),with____.正确答案：:["alltheinitialconditionsareassumedtobezero"]第10题填空题(1分)LaplaceTransformofδ(t)is____.正确答案：:["1"]第11题填空题(1分)Amplitudefrequencyresponseofasystemisshownasthefigure,frequencybandwidthis____.正确答案：:["16.43kHz"]第12题填空题(2分)Tworequirmentstoachieveafidelitymeasurementare____,____.正确答案：:["Amplitudefrequencyresponseisconstant"]正确答案：:["Phasefrequencyresponseispropotional"]第13题填空题(1分)A5-kgmassisstaticallysuspendedfromaload(force)cellandtheloadcelldeflectioncausedbythismassis0.01mm.Thenaturalfrequencyoftheloadcellis____.正确答案：:["990Hz"]第14题填空题(3分)Foradynamicsystem,systemresponsecanexpressedas____,____，____.正确答案：:["transmissioncharacteristics"]正确答案：:["frequencyresponse"]正确答案：:["differentialequations"]第15题判断题(1分)Autocorrelationfunctionofperiodicsignalisstillperiodicsignalwiththesamefrequency.第16题填空题(2分)randomsignalcanbecalssifiedas____and____.正确答案：:["stationary"]正确答案：:["nonstationary"]第17题填空题(2分)Stationaryrandomprocessesmaybefurthercategorizedasbeingeither____or____.正确答案：:["ergodic"]正确答案：:["nonergodic"]第18题填空题(1分)f(t)*δ(t）=____.正确答案：:["f(t)"]第19题填空题(1分)Thefouriertransformofunitimpulseδ(t)is____.正确答案：:["1"]第20题填空题(1分)ifthefouriertransformofx(t)isX(f),thenthefouriertransformofx(kt)is____.正确答案：:["X(f/k)"]第21题填空题(1分)ifthefouriertransformofx1(t)andx2(t)isX1(f)andX2(f),thenthefouriertransformofx1(t)x2(t)is____.正确答案：:["X1(f)*X2(f)"]第22题填空题(3分)Featuresofperiodicsignalspectruminclude:____,____,____.正确答案：:["discrete"]正确答案：:["harmonic"]正确答案：:["convergence"]第23题判断题(1分)Periodicsignaliscomposedwithinfinitiveharmonicperiodicsignals第24题单选题(1分)ThebehaviourofaninstrumentundervaryingconditionsofinputwithtimeisknownasAloadingeffectBhysteresisCdynamicresponseDlinearity第25题单选题(1分)DeadtimeisthetimerequiredbyameasuringsystemtoArespondtoachangeinthequantitytobemeasuredBeliminateloadingerrorCovercomezerodriftDincreasethethresholdvalue第26题单选题(1分)ThresholdvaluecorrespondstotheminimumvalueofaninputrequiredtoAreducedynamicerrorBdetectanoutputCincreasedriftDreducedeadtime第27题填空题(5分)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题填空题(2分)AsimplepassiveLRClow-passfilterisshownasfigure,thedifferentialequationofthissystemis____,thenaturefrequencyis____.正确答案：:["图片1"]正确答案：:["图片2"]Exercise第1题单选题(1分)Straingaugemeasuresstrainbasedonchangesof().AcapacitanceBresistanceCinductanceDlength第2题多选题(2分)Aninfraredthermometerisa()sensor.AcontactBnon-contactsensorCpassiveDactive正确答案：BC第3题多选题(2分)Astraingaugeisa()sensor.AcontactBnon-contactsensorCabsoluteDrelative正确答案：AC第4题多选题(2分)Parallelplatecapacitorcanbeusedasasensorbyvarying().AgapBcapacitiveareaCdielectricityDtemperature正确答案：ABC第5题多选题(2分)Thesematerials()arepiezoelectricmaterials.AquartzBcanesugarCsilicaDsilicon正确答案：AB第6题判断题(1分)Thermocouplemeasuresthetemperaturedifference,soitisanactivesensor.第7题判断题(1分)Inductivesensorsarenormallypassivesensors.第8题判断题(1分)Normally,semiconductorstraingaugesaretemperaturesensitive.第9题判断题(1分)FrequencyofthesourcemustbelowwithrespecttothefrequencyofmotionofthecoretoavoiderrorsintheoutputvoltageduetoslowresponseoftheLVDT.第10题判断题(1分)Capacitivefuelgagesarebasedonthechangeofdielectricityofacoaxialcapacitor.第11题判断题(1分)Appearanceofanelectricpotentialacrosscertainfacesofacrystalwhenitissubjectedtomechanicalpressureiscalledpiezoelectriceffect,onthecontrary,itiscalledinversepiezoelectriceffect.第12题填空题(2分)Asensorthatrequiresexternalpowertooperateisa____sensor,whilethatgeneratesitsownelectricsignalanddoesnotrequireapowersourceisan____sensor.正确答案：:["passive"]正确答案：:["active"]第13题填空题(1分)Theunitofstrainis____.正确答案：:["1"]第14题填空题(2分)Constantanisanormallyusedmaterialforstraingauge,andithasa____percentofCuand____percentofNiinweight.正确答案：:["0.6"]正确答案：:["0.4"]第15题填空题(1分)ALVDTneedsoneprimarycoil,andtwosecondarycoilsconnectedin____.正确答案：:["opposition"]第16题填空题(2分)Asensorthatrequiresexternalpowertooperateisa____sensor,whilethatgeneratesitsownelectricsignalanddoesnotrequireapowersourceisan____sensor.正确答案：:["passive"]正确答案：:["active"]第17题填空题(2分)Constantanisanormallyusedmaterialforstraingauge,andithasa____percentofCuand____percentofNiinweight.正确答案：:["0.6"]正确答案：:["0.4"]第18题填空题(2分)Asensorrequiressignaltransformationfrom____quantityto____quantity.正确答案：:["physical"]正确答案：:["elelctrical"]第19题填空题(1分)Physicalstimu