仪表考试题答案

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1、仪表考试题答案One,thequesticm:Thehigherthepressure,thesmallerthestructureofthebellows.Thespringtubepressuregaugeisdesignedtoeliminatethegapbetweenthetransmissionmechanismandreducethevariationoftheinstrument・Thesignalthatthehallpressuretransmitterissenttothesecon

2、daryinstrumentisthevoltagesignal(thesquareroot)・Thecorrectinstallationofthecompensationconductorshallbeappliedfromthethermocoupletothesecondaryinstrument(squareroot)・Thepressurelevelcanbeusedtomeasureexposureorthemediumlevelofthesealedcontainer(x)・Whenthe

3、flowrateislessthananhour,theinertiaforceofthefluidplaysaleadingrole,andwhenthevelocityishigher,theviscousforceplaysaleadingrole・(x)Heatexchangeoccurswhenanymetalobjectisexposedtotwodifferenttemperatures・(fx)ThethermodynamictemperatureisthesameastheCelsius

4、temperature,butthestartingpointisdifferent・(fx)Thedrawbackofintegraladjustmentisthatthereisalag.(fx)Standardthrottlingdevicesdonotneedtobeequippedtomeasuretheviscousmaterialandcorrosivemateria1.（x）Theupstreamanddownstreamofthethrottlingdevicedonotneedsuff

5、icientstraightpipelength・（x）Theelectromagneticflowmeterisnotabletomeasuretheflowofgas・（fx）Theoutputcurrentoftheelectromagneticflowmeterisrelatedtothecablerelationship・（fx）Thestrokeofthestemisproportionaltothesizeoftheinputsignalofthevalvelocator・（fx）Thera

6、tiooftheproportionalintegralcontrollercangreatlyincreasethestabilityofthesystem・（x）Thesignallineoftheelectromagneticflowmeterisnotallowedtobeworninapipewiththepowercord.（fx）Theprotectivetubeisusedtoprotectthethermocouplefromchemicalcorrosionandmechanicald

7、amage・（fx）Thestandardorificeisusedinbothdirectionstomeasuretheflow.（x）Theaccuracyratingoftheinstrumentisbasedontherelativeerror（squareroot）・Usetheforbiddenoilintheoxygenpiping.Theacetylenepressuregaugecanbeusedforcoppersealingpads(x).Themaximumpressurelin

8、eshouldnotbegreaterthan50meters・Nationalregulations(standard)slope1:10、1:10(squareroot)Inordertomaketheflowcoefficientoftheorificeflowmeterconstant,theReynoldsnumberofthefluidshouldbegreaterthanthelimitoftheReynolds