sensors and detection technology知到智慧树章节测试课后答案2024年秋江苏大学

sensorsanddetectiontechnology知到智慧树章节测试课后答案2024年秋江苏大学第一章单元测试

Whatarethecharacteristicsofthemeasurement?（）。

A:ObjectiveB:SelectiveC:DescriptiveD:Relative

答案:Objective；Selective；DescriptiveInamercurythermometerasseeninthisfigure,whichoneisthesensingelement?（）。

A:BulbB:StemC:ScaleD:Mercuryinthebulb

答案:MercuryinthebulbWhatcomponentsarethereinacomplexmeasurementsystem?（）。

A:SensorB:SignalconditioningC:OutputD:Dataprocessing

答案:Sensor；Signalconditioning；Output；DataprocessingSelectivityisanecessarybutnotsufficientaspectofmeasurement.（）

A:错B:对

答案:对Therearetwodifferentsystemsfortheunitsoflength,themetricunitsandthecustomaryunits?（）

A:错B:对

答案:对Anyphysicalquantitycanbeexpressedintermsofthebaseunits.（）

A:对B:错

答案:错Theadditionalunitsareindependenttoeachother,butnotindependenttothebaseunits.（）

A:对B:错

答案:错InSIunits,therearedifferentkinds.Theyare?（）。

A:AdditionalunitsB:SecondlyunitsC:DerivedunitsD:Baseunits

答案:Additionalunits；Derivedunits；BaseunitsInthefollowunits,whoarebaseunits?（）。

A:MeterB:SecondC:KilogramD:Radian

答案:Meter；Second；KilogramInthefollowunits,whichoneisnotthederivedunits?（）。

A:AmpereB:WattC:HourD:Hertz

答案:AmpereInSIsystem,therearedifferentleversofstandards,theyare（）。

A:SecondarystandardsB:ReferencestandardsC:WorkingstandardsD:Primarystandards

答案:Secondarystandards；Workingstandards；PrimarystandardsTheInternationalPrototypeMeteristheprimarystandardoflength.（）

A:对B:错

答案:对Allmeasurementsofcontinuumsinvolveerrors.（）

A:错B:对

答案:对Inameasurementwegetthemeasuredvalueis50mm.ifthetruevalueis50.02mm,thenwhatisthemeasurementerror?（）。

A:-0.02mmB:50.02mmC:0.02mmD:50mm

答案:-0.02mmAtruevalueisthevaluethatanobjectreallyexistswhenitismeasured,anditcanbeobtainedbymeasurement.（）

A:对B:错

答案:错Whatarethecharacteristicsoftherandomerrors?（）。

A:areunpredictable.B:thevaluesareverysmallC:maybepredictedandhenceeventuallyremovedfromdataD:cannotbecorrected

答案:areunpredictable.；thevaluesareverysmall；cannotbecorrectedInalengthmeasurement,wemeasurethelength10timesandgettheaveragelength1.55m,andtheuncertaintyofthemeasurementis5cm.Thenthemeasuredlengthis（）。

A:1.50mB:(1.55±5)mC:(1.55±0.05)mD:1.60m

答案:(1.55±0.05)mWhichoneisnotthestaticcharacteristicofatransducer?（）

A:SensitivityB:AccuracyC:DampingD:Hysteresis

答案:DampingInameasurement,thefullscaleofthetransduceris100millivolts,andthedifferencebetweentheincreasingrunandthedecreasingrunis25millivolts,Thenwhatisthehysteresisofthetransducer?（）

A:100millivoltsB:25%C:0.25millivoltsD:25millivolts

答案:25%Tocalibratethedeadbandofatransducerbyslowlyincreasingtheinputsignal.Ifthenotedinputis5μm,andthespanofthetransduceris10mm.Thedeadbanderroris（）

A:5%B:0.05%C:5μmD:0.5%

答案:0.05%Inthecalibrationofthelinearityofatransducer,themaximumdifferencebetweenthemeasuredvalueandthecalibrationcurveis-0.25volts,andthefullspanofthetransduceris10volts.Thelinearityerroris（）

A:2.5%B:-2.5%C:-0.25voltsD:0.25%

答案:-2.5%Tocalibratethesensitivityofathermometer.Whentemperatureischangedfrom0ºCto100ºC,theresistancechangesfrom100ohmto153.5ohm.Thesensitivityforthisrangeis（）

A:53.5ohmB:0.535C:0.535ohm/ºCD:53.55%

答案:0.535ohm/ºCDynamiccharacteristics,describesthecharacteristicsthataredeterminedwhilethesystemismeasuringatime-varyingsignal.（）

A:错B:对

答案:对Themeasurementsystemcanbeusedtomeasurefrequenciesclosetothecornerfrequency.（）

A:错B:对

答案:错Foradynamicmeasurementsystemorsensor,ifthedampingratioζis0.77,itis（）

A:criticallydampedB:UnderdampedC:overdampedD:others

答案:Underdamped

第二章单元测试

Sensorisadevicethatsensesaphysicalstimulusandconvertsitintoasignal,usuallyelectrical,mechanicaloroptical.（）

A:对B:错

答案:对Inbelowpicture,whichexpressionisright?（）

A:LowaccuracyandlowprecisionB:HighaccuracyandlowprecisionC:HighaccuracyandhighprecisionD:Lowaccuracyandhighprecision

答案:LowaccuracyandhighprecisionDisplacementisdefinedasthedifferencebetweentheinitialpositionofsomethingandanylaterposition.（）

A:对B:错

答案:对Possiblemeasurementofadisplacementtransducercanbe（）。

A:PositionB:velocityC:ThicknessD:Width

答案:Position；Thickness；WidthWhichoneisnotthetypeofcapacitivesensor（）。

A:AnglevariationB:AreavariationC:MediumvariationD:Spacingvariation

答案:AnglevariationGenerallythespacingvariationcapacitivesensorissuitabletosmalldisplacementmeasurementbecauseoftheparaboliccapacitance-motionrelationship.（）

A:错B:对

答案:对Forallkindsoftheareavariationcapacitivesensor,therelationshipbetweentheinputdisplacementandtheoutputcapacitanceislinear.（）

A:错B:对

答案:对Thesensitivitykofamedium-variationcapacitivesensoris（）。

A:B:C:D:

答案:Tomeasurethethicknessofasteelsheet,whichtypeofcapacitivesensorcanweuse?（）。

A:AnglevariationB:SpacingvariationC:AreavariationD:Mediumvariation

答案:MediumvariationInamutualinductancesensor,theremustbeatleasttwocoils.（）

A:错B:对

答案:对Insensors,differentialstructureisoftenusedbe（）。

A:BetterlinearityB:LowerinterferenceC:DoublesensitivityD:Fasterdynamicresponse

答案:Betterlinearity；Lowerinterference；DoublesensitivityWhatkindofinductivesensorisitshowninbelowpicture?（）。

A:Angle-variationinductancesensorB:Gap-variationself-inductancesensorC:MutualinductancesensorD:Areavariationself-inductancesensor

答案:Areavariationself-inductancesensorLinearVariableDifferentialTransformer(LVDT)isamutual-inductivesensor.（）

A:对B:错

答案:对WhataretheadvantagesofLVDT?（）。

A:HighlinearityB:HighsignaltonoiseratioC:HighsensitivityD:Bigtemperaturerange

答案:Highsignaltonoiseratio；Highsensitivity；BigtemperaturerangeAboutEddy-currenteffect,whatarerightbelow?（）。

A:TheEddyCurrentisinthesensingcoil.B:TheEddyCurrentwillcreateanopposingmagneticfieldwhichresiststheoriginalmagneticfield.C:ItisalsocalledSkineffect.D:ItistheoperationprincipleofEddyCurrentsensors.

答案:TheEddyCurrentwillcreateanopposingmagneticfieldwhichresiststheoriginalmagneticfield.；ItisalsocalledSkineffect.；ItistheoperationprincipleofEddyCurrentsensors.Tomeasurethethicknessofasteelsheet,weshouldusereflectivemodewithlowfrequencyofEddyCurrentsensor.（）

A:错B:对

答案:错WhatcanEddycurrentdisplacementsensorsbeusedfor?（）

A:BrakingmachanismintrainsB:RotatingspeedindicatorsC:ThicknessmeasurementofasteelsheetD:Non-destructivetesting

答案:Brakingmachanismintrains；Rotatingspeedindicators；Thicknessmeasurementofasteelsheet；Non-destructivetesting

第三章单元测试

Modulationcanberegardedas（）betweenmessagesignalandcarriersignal.

A:subtractingB:combiningC:DividingD:multiplying

答案:multiplyingThefunctionoflow-passfilteris（）

A:filteringhigh-frequencysignalB:transformingDCintoACC:transformingACintoDCD:filteringlow-frequencysignal

答案:filteringhigh-frequencysignalTheamplitudemodulationprocessisequivalenttothe（）processoffrequency.

A:DisappearingB:amplificationC:contractionD:transferring

答案:transferringAmplitudemodulationwaveis（）

A:theamplitudeofcarriersignalvarieswiththeamplitudeofthemessagesignalB:theamplitudeofcarriersignalvarieswiththefrequencyofthemessagesignalC:theamplitudeofcarriersignalvarieswiththephaseofthemessagesignalD:thefrequencyofcarriersignalvarieswiththeamplitudeofthemessagesignal

答案:theamplitudeofcarriersignalvarieswiththeamplitudeofthemessagesignalTheoutputofWheatstonebridgeonthestateofinitialequilibriumisequalto（）

A:0VB:3VC:2VD:1V

答案:0VIftheinputpulseofinvertingamplifierispositive,thentheoutputpulsewillbe（）.

A:negativeB:changedwithrespecttoinputby90DegreesC:uncertainD:positive

答案:negativeAhighpassfilterisafilterwhichpassesandimpedes.（）

A:high-frequencysignalslow-frequencysignalsB:low-frequencysignalshigh-frequencysignalsC:anarrowbandoffrequencieslow-frequencysignalsD:high-frequencysignalsanarrowbandoffrequencies

答案:high-frequencysignalslow-frequencysignals

第四章单元测试

Whichofthefollowingisfalseforacontinuoustimesignal?（）

A:NoneoftheaboveB:AnysignalcanbeexpressedasthesumofanoddandanevensignalC:SumoftwoperiodicsignalsisalwaysperiodicD:Aynperiodicsignalcanbeexpressedassumofsinusoidalsignals

答案:SumoftwoperiodicsignalsisalwaysperiodicIdentifythenatureofthesignalshowninthegivenimage.（）

A:EvensignalsB:OddsignalsC:PeriodicsignalsD:Aperiodicsignals

答案:OddsignalsThenthesequenceis（）

A:B:C:D:

答案:Timeshiftingofdiscretetimesignalmeans（）

A:B:C:D:

答案:Autocorrelationismaximumat（）

A:NoneofthementionedB:OriginC:UnityD:Infinitepoint

答案:OriginAutocorrelationfunctionofperiodicsignalisequalto_____（）

A:PowerofthesignalB:NoneofthementionedC:ItsareainfrequencydomainD:Energyofthesignal

答案:PowerofthesignalTheautocorrelationofawide-sensestationaryrandomprocessisgivenby,thepeakvalueoftheautocorrelationis（）

A:2B:eC:0D:1

答案:1ThecorrelationcoefficientbetweentwovariablesXandYis0.4.Thecorrelationcoefficientbetween2Xand-Ywillbe____.（）

A:-0.8B:-0.4C:0.8D:0.4

答案:-0.4Thevalueofsimplecorrelationcoefficientliesintheinterval____.（）

A:[-1,1]B:[-,]C:[0,1]D:[-1,0]

答案:[-1,1]Twovariablesaresaidtobepositivelycorrelatedwhenwith_____inthevalueofonevariable,thevalueofothervariablealso_____.（）

A:Nochange,RisesB:Fall,RisesC:Rise,FallsD:Fall,falls

答案:Fall,fallsCalculatePearson’scoefficientofcorrelationonthefollowingdata:（）

X15182124273036394248Y25252727313335414145

A:0.75B:0.98C:0.89D:0.45

答案:0.98AwiderwindowinSTFTwillleadtoabetterfrequencyresolution,apoorertimeresolution.（