第1題Whichisthedevicethatbelongtotheresearchfieldofmeasurementtechnology?AMercurythermometerformeasuringbodytemperatureBAcompassmadeofmagnet,suchastheSinancompassinancientChinaCMechanicalscalescommonlyusedforweighinginruralareaDElectronicscalesinsupermarkets第2題Whichoneofthefollowingsensorsisnotincludedonthephone?AAccelerationsensorBSoundsensorCHumiditysensorDBrightnesssensor第3題WhatkindofproductisDanishB&Kmainlyengagedin?AComputervirtualinstrumentsystemBVibrationandnoiseCOscilloscopeDGeneralindustrialsensors第4題Whichofthefollowingisnotaninternalcomponentofthemeasuringsystem?ATestobjectBActuatorCAnalysis/displaydeviceDSignalconditioningdevice正確答案：AB第1題ThefollowingisameasuredECGsignalwaveform,whichcanbeapproximatelyviewedasaperiodicsignal.Whatisthefrequencyofthesignal?A84HzB1HzC1.4HzD60Hz第2題ThefollowingMatlabcodegeneratesa600Hzsinewavesignal.Sincethewaveformofthefullsignalisdisplayed,thedetailsarenotclear.Whichofthefollowingfunctioncanweusetoimprovethedisplayingofdetails?AaxisBgridCtitleDsubplot第3題WhichisthecorrectcodetogeneratethefollowingsquarewaveinMatlab?Ay=square(2*pi*60*t,75)By=sawtooth(2*pi*60*t,25)Cy=square(2*pi*60*t,25)Dy=sawtooth(2*pi*60*t,75)第4題TheA/Dconverterisusedtoconverttheanalogsignalstodigitalsignals.Foran8-bitA/Dconverterwithaconversionspeedof1msandananaloginputrangeof0-5V,ifa3.3Vanalogsignalisinputted,thedigitalsignaloutputshouldbe:A168B3.3C168.9D3第5題Fromtheperspectiveofsignalclassification,whichtypeofsignaldoesthefollowingpicturebelongto?APowersignalBDeterministicsignalCPeriodicsignalDEnergysignal正確答案：ABCQuiz3第1題Ifwewanttogetthetimedomainandfrequencydomaincharacteristicsofasystembytheoutputofafunction,whichofthefollowingfunctioncanbeusedastheinput:Asinc(t)Bδ(t)Csin(t)Du(t)第2題ThefollowingisacodeforFouriertransformusingFFTinMatlab.WhichoneofthefollowingvaluesiscorrectforN:A500B1024C1048D1000第3題Fromtheperspectiveofcorrectingthefenceeffecterrorofthespectrum,whichofthefollowingwindowfunctionsperformsbest?ARectanglewindowBBlackmanwidowCFlattopwindowDHammingwindow第4題InthepropertiesoftheFouriertransform,theparitypropertymeans:AIfx(t)isanoddfunction,thentheFouriercoefficientsan=0,bn=0,n=1,2,3,4,5,6BIfx(t)isanevenfunction,thentheFouriercoefficientsan=0,n=1,2,3,4,5,6CIfx(t)isanevenfunction,thentheFouriercoefficientsbn=0,n=1,2,3,4,5,6DIfx(t)isanevenfunction,thentheFouriercoefficientsan=0,bn=0,n=1,2,3,4,5,6第5題Whichoneiscorrectabouttheconceptofsignalspectrum?AThepowerspectrumofthesignalisthesquareoftheimaginaryspectrumBThepowerspectrumofthesignalisthesquareoftherealspectrumCThepowerspectrumofthesignalisthesquareoftheamplitudespectrumDB.Thepowerspectrumofthesignalisthesquareofthephasespectrum第6題AccordingtotheFouriertransformtheory,theperiodicsignalcanbeexpandedintoasetoforthogonalsineandcosinesignals.Forthe50Hzsquarewavesignalshownbelow,whichexpansioniscorrect?A(12/π)*{sin(2π50t)+sin(2π150t)/3+sin(2π250t)/5+sin(2π350t)/7+......

}+(12/π)*{cos(2π50t)+cos(2π150t)/3+cos(2π250t)/5+cos(2π350t)/7+......

}B(12/π)*{sin(2π50t)+sin(2π150t)/3+sin(2π250t)/5+sin(2π350t)/7+......

}C(12/π)*{cos(2π50t)+cos(2π150t)/3+cos(2π250t)/5+cos(2π350t)/7+......

}D0.5*(12/π)*{sin(2π50t)+sin(2π150t)/3+sin(2π250t)/5+sin(2π350t)/7+......

}+0.5*(12/π)*{cos(2π50t)+cos(2π150t)/3+cos(2π250t)/5+cos(2π350t)/7+......

}第7題Forawristwatch-typeECGsignaldetector,consideringthepowerfrequencyelectromagneticinterference,whatshouldthedigitalsignalsamplingfrequencybe?A250B500C10D50正確答案：ABQuiz4第1題Whatisthemaindifferencebetweenprobabilitydensityfunction(PDF)andhistogram?AThecalculationmethodsforhistogramandPDFaredifferentBThevaluesonhistogramcurvearelargerthanthevaluesonPDFcurveCTheshapesofhistogramcurveandPDFcurvearedifferentDTheintegrationofthePDFcurveequals1,thestepofordinateaxisinthehistogramis1第2題Whataretheabscissaandordinateoftheprobabilitydensitycurve?AAbscissaisprobabilitydensity,ordinateistimeBAbscissaistime,ordinateisprobabilitydensityCAbscissaisprobabilitydensity,ordinateisamplitudeDAbscissaisamplitude,ordinateisprobabilitydensity第3題Thefigureshowsthehistogramofasignal,whichofthefollowingcanweinfer?AThemostlyoccurredsignalvalueis1.1BThemostlyoccurredsignalvalueis1.3CThepeakvalueofthesignalis1.1DThepeakvalueofthesignalis2.2第4題Thefollowingfiguresshowtheimagesofeyeballbeforeandafterhistogramequalization.Whichhistogramcouldbethehistogramoftheoriginalimage?A(a)B(b)C(c)D(d)第5題WhichisthefunctiontoplotprobabilitydensitycurveinMatlab?AhisteqBhistogramChistogramDhistQuiz5第1題Whichcorrelationpropertymakesfilteringwhitenoisebyautocorrelationpossible?AWhenτ=0，theautocorrelationfunctionhasthemaximumvalueBTheautocorrelationfunctionofaperiodicsignalisstillaperiodicsignalofthesamefrequency,butitdoesnotretainthephaseinformationoftheoriginalsignalCTheautocorrelationfunctionoftherandomnoisesignalwilldecayrapidlyasτ

increasesDTwoperiodicsignalswithdifferentfrequenciesarenotcorrelatedtoeachother第2題WhichisthecodeforcalculatingautocorrelationinMatlab?As=xcorr(x,'unbiase');B

s=xcorr(x,'biased');Cs=xcorr(x,'unbiased');Ds=xcorr(x,'biase');第3題Whatisthecross-correlationofa10Hzsquarewaveanda20Hzsinusoidalwave?AZerolineB10HzsinusoidalwaveC20HzsinusoidalwaveDAsignalwithcomplicatedwaveform第4題Thefollowingfigureshowsasoundsignalwithitsechoandtheautocorrelationcurve.Whichstatementiscorrect?AThetimeofflightofthereflectedechois0.004sBThetimeofflightofthereflectedechois0.002sCThetimeofflightofthereflectedechois0.4sDThetimeofflightofthereflectedechois0.25sQuiz6第1題ComparedwithSTFT,whichisthemainadvantageofwaveletanalysis?AHashigherprecisionintimeandfrequencyBHasfastercalculationspeedandresolutioninfrequencyCHashigherprecisionintimeforlowfrequencycomponentsandhigherprecisioninfrequencyforhighfrequencycomponentsDHashigherprecisioninfrequencyforlowfrequencycomponentsandhigherprecisionintimeforhighfrequencycomponents第2題Comparedwithspectrumanalysis,whatistheadvantageofspectrogramanalysis?ACansegmentlongsignaltogivehighprecisionintimeBCansegmentlongsignaltoreducethenoiseinterferenceinspectrumbyaveragingspectraCCansegmentlongsignaltoreducethefenceeffecterrorandincreasetheprecisionforhighfrequencycomponentsDCansegmentlongsignaltoincreaseresolutioninfrequencyQuiz7第1題Whichofthefollowingiswrong?AIIRfilterhaslargerimpulseresponseconstantthanFIRfilterBUnderthesamefilteringcharacteristic,usuallytheFIRfilterhasbettercalculationefficiencythanIIRfilterCUnderthesamefilteringcharacteristic,usuallytheFIRfilterhaslessphasedistortionthanIIRfilterDFIRfilterhasbetterstabilitythanIIRfilter第2題WhichoftheIIRfiltershasoscillationinbothpassbandandstopband?AChebyshevIBChebyshevIICEllipseDButterworth第3題WhichofthefollowingisnotaFIRfilterforMatlab?Afir0BfirlsCfir1Dfir2第4題Whendescribingthecharacteristicofameasuringsystem,whichofthefollowingiseasiertorealizeincoding?AZtransformBFouriertransformCWavelettransformDLaplacetransform第5題Thebluelineisameasuredsignalthathasbeeninterferedbynoise,whichofthefollowingfilteringmethodsiswrong?ABandpassfilterBHighpassfilterCCorrelationfilterDLowpassfilterQuiz8第1題Whichofthefollowingsensorbelongstonon-contactmeasurement?APiezoelectricaccelerometerBEddycurrentsensorCMovingcoilspeedometerDStraingauge第2題Thefollowingfigureshowscharacteristicsofdifferentthermocoupletypes.Whichonehasthelargestlinearrange?AKBJCCDE第3題Thegratingsensorisbasedonwhicheffect?AReflectionoflightBRefractionoflightCMoirefringeDDiffractionoflight第4題Amajoradvantageofthefiberopticsensoristhemultiplexing,itsprincipleis:ASeparatethesensorsintime,eachsensorsendsthesignalinturnBSeparatethesensorsinfrequency,allthesensorssendthesignalatthesametimeCSeparatethesensorsinbothtimeandfrequency,allthesensorssendthesignalatthesametimeDSeparatethesensorsinamplitude,allthesensorssendthesignalatthesametime第5題Whichdescriptioniswrongforthethermocouple?AWhenthetwomaterialsusedinthethermocouplearethesame,itcanbeusedtomeasuretemperatureBWecanuseacompensationwiretoreplacethematerialatanon-measuringpointtomakethesignaltransmissionCWecanuseacoldjunctiontoincreasetheaccuracyDWhenthetwomaterialsusedinthethermocouplearethesame,itcannotbeusedtomeasuretemperature第6題Theheartratemeasuringsystemisbasedonwhicheffect?AHalleffectBThermoelectriceffectCUltrasonicimagingDPhotovoltaiceffect第7題WeareplanningtouseHallsensortoinspectdefectsinsideasteelplate,besidestheHallsensor,whichofthefollowingisneeded?APiezoelectricsensorBMagnetCIroncoreDElasticelement第8題Thefollowingfigureshowsthesignalforexcitationandreflectedwaveinultrasonicranging.Whatisthedistancebetweenthetestedobjectandthesensor?A100mB50mC10D5m第9題Whichofthefollowingapplicationcanberealizedbyamovingcoil(magneto-electric)sensor?AMeasuringdisplacementBMeasuringtherotationalspeedofanaxisCMeasuringthevibrationofaplateDMeasuringtheearthmagneticfield第10題Whichofthefollowingapplicationcanberealizedbyapiezoelectricsensor?AMeasuringdisplacementBMeasuringtherotationalspeedofanaxisCMeasuringthevibrationofaplateDMeasuringtheearthmagneticfield第11題Thecapacitiveproximitysensorcanbeusedfornon-conductorwhiletheinductiveproximitysensorcanonlybeusedforconductor.第12題Therearelotsofsensorsinthesmartphone,whichofthefollowingisacapacitivesensor?ALuminancemeterBGPSCMicrophoneDTouchscreen正確答案：DC第13題WhenweuseArduinotobuildameasuringsystem,theoutputsignalofasensorshouldbeconnectedtowhichpartoftheboard?APinsin1BPinsin

2CPinsin

3DPinsin

4第14題Whichisthemainadvantageofmutualinductivesensorwhencomparedwithself-inductiveandeddycurrentsensors?AHighsensitivityBLowcostCSmallsizeDGoodlinearity第15題Thefollowingfigureisainductivesensoranditsequation.Ifwewanttodesignavariableareadisplacementsensor,whichofthefollowingiscorrect?AMovearmatureupanddown,changethevalueofdeltaintheequationBMovearmatureleftandright,changethevalueofNintheequationCMovearmatureupanddown,changethevalueofAintheequationDMovearmatureleftandright,changethevalueofAintheequation第16題WhatisArduino?AAnoperatingsystemBAsoftwareforsignalanalysisCAdevelopingboardingformicrocontrollerDACPUchip第17題Whichofthefollowingcanbemeasuredwithamagneto-resistorandamagnet?ACountingthetoothofsteelgearthatpassbythesensorBCountingthenumberofbottledwaterthatpassbythesensorCCountingthenumberofprintingpapersthatpassbythesensorDCountingthealuminumpartsthatpassbythesensor第18題Underwhichcondition,theoutputandinputofaresistivesensorcanhavebetterlinearity?ALoadingresistanceishalfoftheresistanceofthesensorBLoadingresistanceisinfinityCLoadingresistanceiszeroDLoadingresistanceisthesameastheresistanceofthesensorQuiz9第1題Whichofthefollowingismorelikelytobeasignalafterfrequencymodulation?AaBbCcDd第2題Whichisthemainadvantageoffrequencymodulationwhencomparedwithamplitudemodulation?AUseslessbandwidthBCircuitformodulationanddemodulationissimpleCFastcalculationspeedDStronganti-interference第3題WhichofthefollowingMatlabfunctionsisforamplitudemodulation?AdmmodBpmmodCfmmod

Dammod第4題Whichoffollowingisnecessaryforthenon-suppressedmodulation?AADCbiasshouldbeaddedtothesensorsignalBThecarriersignalsusedinthemodulationanddemodulationshouldhavethesamephaseCThecarriersignalsusedinthemodulationanddemodulationshouldhavethesameamplitudeDADCbiasshouldbeaddedtothecarriersignal第5題Whenthesensorsignalneedstobetransmittedinlongdistance,whichofthecircuitshouldweusebeforethetransmission?ACurrenttovoltagemoduleBVoltagetocurrentmoduleCInvertingamplifierDVoltagefollower第6題Whichofthefollowingcircuitisbestsuitedforstraingauge?AChargeamplifierBBridgeamplifierCInvertingamplifierDNon-invertingamplifierQuiz10第1題Whichofthefollowingisnotacharacteristicofthelinearsystem?ASuperpositionBFrequencyretaintivityCSamplingcharacteristicDProportionality第2題Whichofthefollowingequationisusedtodescribealinearsecondordersystem?AaBbCcDd第3題Whichofthefollowingisusedtodescribethecharacteristicofasecondordersystem?ASensitivityBTimeconstantCDampingcoefficientDAmplification第4題Thefollowingfigureistheamplitudespectrumforanaccelerometer.Whatisthenaturalfrequency?A20HzB10HzC10kHzD25kHz第5題Thefollowingistherampresponseforatemperaturesensor,whatisthetimeconstant?A0.5sB1sC0.1sD0.2s第6題Foranelectronicscale,theoutputvoltagefor500gweightis1.2V.Whenweaddanotherweightof100g,thereadingbecomes1.5V.Whatisthesensitivity?A