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1、热工仪表初判断（Preliminaryjudgmentofthermalinstrument）Two.Judgmentquestions1.Thetotalcurrentoftheseriescircuitisequaltothesumofthecurrentsoneachresistor.()Answer:X2.Thetotalresistanceofseriescircuitisthesumofeachresistor.()Answer:B.3.Thedirectionofthemagneticfieldlineinthedir
2、ectionoftheNpoleofthemagnetisusuallydefined.()Answer:B.4.Usuallythedirectionofpositivechargeisthedirectionofcurrent.()Answer:B.5,intheoutsideofthemagnet,thedirectionofthemagneticfluxlinealwaysstartsfromtheNpolebacktotheSpole,whileinthemagnet,themagneticfieldlineisfromS
3、poletoNpole.()Answer:B.6.Thedirectionoftheelectricfieldisthedirectionoftheforceactingonthepositivechargeintheelectricfield.()Answer:B.7,reactivepowerisuselesspower.()Answer:X8.IfthecapacitorsoftheNseriescapacitorsarethesame,thevoltagetheybearisequal,andthevoltageoneach
4、capacitorisequaltothe1/nofthepowersupplyvoltage.()Answer:B.9,twocapacitors,alargercapacitance,asmallercapacitance,whenchargingtothesamevoltage,thelargercapacitanceofthecapacitormorecharged.()Answer:B.10,exchangethree-phaseACmotoranytwolines,willnotaffectitsnormalwork.(
5、)Answer:X11,theinstantaneousproductoftheinstantaneouscurrentandtheinstantaneousvalueofthevoltageistheinstantaneouspowerconsumedbytheresistor.()Answer:B.12.Thetechnicalindextoevaluatethequalityoftheinstrumentisthemaximumabsoluteerroroftheinstrument.()Answer:X13.Theabsol
6、utevalueoferrorisabsoluteerror.()Answer:XTheaccuracygradeis14,theaccuracyoftheinstrumentinstrumenttoremovethesign.()Answer:B.15,China'slegalunitofmeasurementisbasedontheinternationalsystemofunits,combinedwiththeactualsituationinChinatoincreasesomenoninternationalunits.
7、()Answer:B.16.Themeasurementerrorcausedbytheoperator'smistakeandcarelessnessiscalledrandomerror.()Answer:X17.Measurementisanecessarymeanstoobtainquantitativerelationsbetweenvarioustransactions.()Answer:B.18,themeasurementequipmentandcircuitinstallation,layoutandadjustm
8、entimproperly,theoperatorisnotskilled,inaccuratereadingsarethecauseofsystemerrors.()Answer:B.19.Themagnitudeofthetemp
