下载
加入VIP
  • 专属下载特权
  • 现金文档折扣购买
  • VIP免费专区
  • 千万文档免费下载

上传资料

关闭

关闭

关闭

封号提示

内容

首页 弱电基础知识(The basic knowledge of the weak)

弱电基础知识(The basic knowledge of the weak).doc

弱电基础知识(The basic knowledge of t…

没有什么东西是永恒de
2018-04-01 0人阅读 举报 0 0 暂无简介

简介:本文档为《弱电基础知识(The basic knowledge of the weak)doc》,可适用于社会民生领域

弱电基础知识(Thebasicknowledgeoftheweak)弱电基础知识(Thebasicknowledgeoftheweak)TheapplicationofpowercanbedividedintotwocategoriesaccordingtothehighvoltageandlowvoltagepowertransmissionpowerlevelConstructionofbuildingsandelectricitygenerallyreferstotheexchangeofVHzandabovepowerMainlytoprovideelectricenergytoconvertelectricenergytootherenergysources,suchasairconditioningelectricity,lighting,powerandsoonIntelligentbuildinghastwomaincategories,oneisthenationalsecurityrequirementsofthevoltagelevelandcontrolvoltageoflowvoltageelectricenergy,WithACandDCbranch,ACV,VDC,VDCpowersupply,emergencylightingorstandbypowersupplyTheotheroneiscarryingvoice,image,dataandotherinformationsourcesofinformation,suchastelephone,televisionandcomputerinformationPeopleusedtotheweaktechnologycalledweaktechnologyThebasicmeaningofintelligentbuildingtechnologyisstilltheoriginalmeaningoftheweaktechnologyButwiththerapiddevelopmentofmodernelectronichightechnology,applicationtechnologyinintelligentbuildingweakmoreandmorewidelySuchastheintelligentfirecontrolsystem,monitoringsystem,computernetwork,buildingautomation,intelligentbroadcastingetcTheextentofapplicationofweakcurrenttechnologydeterminestheintelligentlevelofintelligentbuildingIngeneral,weaksystemsengineeringreferstosecondtypesofapplicationsMainlyincludes:,TVsignalengineering,suchasTVmonitoringsystem,cabletv,communicationengineering,suchastelephone,intelligentfireprotectionengineering,soundandsoundengineering,suchasresidentialbuildingsinthebackgroundmusicbroadcast,backgroundmusic,thecomprehensivewiringproject,mainlyusedincomputernetworkWiththerapiddevelopmentofcomputertechnology,softwareandhardwarefunctionquicklystrong,perfectcombinationofvariousweaksystemsengineeringandcomputertechnology,thepreviousclassificationislessclearIntegrationofallkindsofengineering,isthesystemintegrationAchoiceThethresholdvoltageofTTLNANDgateintheory(equal)(A)V(B)V(C)V(D)Vsynchronousoscilloscopewithtriggerscanning,cycletriggerscanningvoltage(measured)pulsetoobservationsites(onecycle,pulsewidth,frontier)(A)(B)isfargreaterthantheslightlygreaterthanorequaltothe(C)(lessthanD)isfarlessthanno()thecharacteristicsofmicrocomputer(A)canreplacehumanmentallabor(B)price(C)(D)withhighreliabilityandhighspeedoperationTheelevatorcarratedloadiskg,undernormalcircumstancescantakethecar()shouldbefullof(A)(B)(C)(D)nostaticerrorcontrolsystem,andtheoutputvoltageproportionalregulator()(A)isdirectlyproportionaltotheinputvoltage(B)isinverselyproportionaltotheinputvoltage(C)theinputvoltageisproportionaltotheinputvoltage(D)isinverselyproportionaltothesquareinhighcapacitythreephaseinverter,theswitchingelementisgenerallynotused()(A)thyristorinsulatedgatebipolartransistor(B)(C)GTO(D)powertransistortimequotausuallyincludesworktime,worktime,and()needstimeandendtimeofpreparationandprocessingetc(A)assisted(B)rest(C)(D)lossofworkconsumednonproductiveworkOneofthedisadvantagesofthethreephaseACcommutatormotorworkingvoltageisnottoohigh,generallyratedvoltage()(A)lessthanV(B)thanV(C)lessthanV(D)ismorethanVInthephasehalfcontrolledbridgerectifiercircuit,commoncathodegrouprequirementsofthyristortriggerpulsephasedifferencebetweenthe():replyDianziFansThefloor(A)(B)(C)degreesdegreesdegrees(D)Insulatedgatebipolartransistor()hastheadvantagesof(A)thyristor(B)unijunctiontransistor(C)electricfieldeffecttransistor(D)powertransistorandpowerFETconvertthebinarynumbertosixteenhexadecimalnumberis()(A)AH(B)AH(C)BH(D)BHCNCCNCmachinetoolsintheprogrammablecontrollercontrolinstructions,tocontrol(machine)(A)tablefeed(B)tooltoenterJian(C)andspindlespeedfeed(D)toolchanger,risingoilpumpvoltagetypeinverterisused()(A)capacitorstobuffertheactiveenergy(B)capacitorstobufferthereactiveenergy(C)tobuffertheactivepowerinductor(D)inductortobufferthereactiveenergyinthefollowingway,cannotchangetheACasynchronousmotorspeed(is)(A)changepolesofthestatorwinding(B)voltagechangeofpowersupply(C)tochangethepowersupplyfrequency(D)changethemotorslipinthewormgearworm,transversesectionmodulusandthemodulusshouldbeequal(worm)(A)longitudinalsection(B)crosssection(C)end(D)methodtosectionmicrocomputercontrolofmechanicalmotionpositionbelongstothemicrocomputerapplications()(A)numericalcalculation(B)industrialcontrol(C)transactionprocessing(D)CADintheRSorgatetrigger,whenR=S=,thetrigger(state)(A)(B)(C)(D)isunchangedinductorsynwheninstalled,mustkeeptwofeetparallel,thegapbetweenthetwoplanesisabout(mm):replyDianziFansThefloor(A)(B)(C)(D)Thecorrectapplicationofthepositioningpinis()(A)pincanbeusedtodrivethetransverseforceandtorque(B)positioningpinusingthenumberofnotlessthantwo(C)usingthepositioningpinnumbercanbelessthantwo(D)positioningpinisusedtoworkoverloadprotection()althoughthegeneratoradvantagescanbeselfdriven,butitspoorperformance(A)andshunt(B)series(C)separatelyexcited(D)productcompoundPLCACdoublespeedelevatortruck,cardoorclosed,thedoorclearanceshallnotbegreaterthanmm()(A)(B)(C)(D)ThefollowingarecontourcontrolCNCmachinetools(is)(A)(B)CNClatheCNCdrillingmachine(C)machiningcenterCNCboringmachine(D)Inthewaveshieldingtubecoveroscilloscopeisgenerallyused(made)(A)copper(B)iron(C)plastics(D)permalloywindingasynchronousmotorrepairaftertheassemblyofthebrush(must)(A)replacement(B)grinding(C)testing(D)heattreatmentthePLCprogrammablecontroller,accordingtodifferentloadconditions,theoutputinterface(typea)(A)(B)(C)(D)voltagenegativefeedbackautomaticspeedcontrolsystem,whentheloadincreases,themotorspeeddecreased,causingthearmaturecircuit()(A)terminalvoltageincrease(B)voltageconstant(C)increasedcurrent(D)currentbasiccircuitcommutatormotor,whenthemotoroperatesinregenerativebrakingstate,theinvertercircuitinthe(state)(A)inverteramplifier(B)(C)(D)rectifierchopper:replyDianziFansThefloorsinglephasehalfbridgeinverter(voltage)oftheoutputvoltage(for)(A)(B)sinewavesquarewave(C)sawtoothwave(D)VVVFtypeelevatorisused(speed)method(A)thechangeofmagneticlogarithm(B)changeslip(C)changeofthesupplyvoltageandfrequency(D)powersupplyvoltagechangeinthespeednegativefeedbacksystem,tomaketheopenandclosedloopsystemswithidealnoloadspeedisthesame,agivenvoltagetoimproveaccordinglythanagivenvoltageofopenloopandtheclosedloop(times)(A)K(B)K(C)(K)(D)(K)includesacompletecomputersystem()(A)computerandperipheraldevices(B)host,keyboardanddisplay(C)hardwaresystemandsoftwaresystem(D)analogcircuitanddigitalcircuitinordertoguaranteethesafeoperationofPLCACelevator,()electricalcomponentsmustbeusednormallyclosedcontactinputtotheinputinterfaceofPLC(A)stopbutton(B)hallcallbuttonladder(C)carcallbutton(D)terminallimitswitchThetransistorasbelongingtotheelectronicdevicefabrication(computer)Thefirstgeneration(A)(B)(C)secondgenerationthirdgenerationfourthgeneration(D)automaticcontrolsystemofopenloopamplification(better)(A)thegreaterthesmaller(B)(C)thedynamiccharacteristicsofthesystemunderthepremiseofthelarger(D)toensurethedynamiccharacteristicsofthesystemunderthepremiseofthesmallerThemainparametersofmagneticscaledynamicrange,accuracy,resolution,anddynamicrange(should)~(A)m(B)m(C)M(D)~mThebasicprincipleis:()generator(A)electromagneticinduction(B)magneticeffectofcurrent:replyDianziFansThefloor(C)thethermaleffectofthecurrent(D)electricalconductorinamagneticfieldforceautomaticproductionlinesdividedbyautomation(class)(A)(B)(C)(D)DCelevatorsystem,elevatorlevelingadjustmentconfirmationshallmeet(mm)(A)(B)(C)(D)intheprocessofmovinggrating(transmissionline),theluminousfluxreceivedbyphotoelectricelementandstrongandweak,sohavetheapproximate(current)(A)FangBo(B)(C)sinewavesawtoothwavetrapezoidalwave(D)inthespeedcontrolsystem,whenthecurrentcutoffnegativefeedbackregulationsysteminthatthemaincircuitcontrolsystem(current)(A)istoolarge(B)small(C)andnormal(D)ZeroInladderprogramming,normallyopencontactandbusconnectioninstructionmnemonicsshouldbe()(A)LDI(B)LD(C)OR(D)ORISwitchingfrequencypowertransistor(FET)power(A)(B)wasslightlyhigherthanthatbelow(C)(D)ismuchhigherthantheintheloadincreases,thecurrentpositivefeedbackcompensationisactuallycausedbythespeed(speed)(A)rose(B)decreased(C)ariseandthendecline(D)decreasedandthenarisewithathreephasecontrollablesiliconexcitationdevice(closedloopsystem)andDCelevatorsystemwithoutgearboxdevice,itsrunningspeedshouldbe(aboutms)(A)(B)(C)(D)DCdifferentialamplifiercircuit(can):replyDianziFansThefloor(A)commonmodesignalamplification,suppressionofdifferentialsignal(B)amplifieddifferentialsignal,suppressionofcommonmodesignal(C)amplifieddifferentialmodeandcommonmodesignals(D)inhibitthedifferentialmodeandcommonmodesignalstomaketheinsulatedgatebipolartransistorturnon(should)(A)atthegatewithapositivevoltage(B)inthecollectorwithpositivevoltage(C)atthegatewithanegativevoltage(D)inthecollectorwithnegativevoltageintheindustrialproduction,iftheneedforlowvoltageandhighcurrentrectifierdevices,commonlyused()controlledrectifiercircuit(A)threephasehalfwave(B)threephasefullwave(C)threephasebridge(D)withthedoubleantistarbalancereactorpowerFETMOSFETinuseandstorage,toprevent()(A)foralongtimeandfailure(B)twobreakdown(C)electrostaticbreakdown(D)saturationthyristorchopperisusedinDCpowersupplydeviceofadjustingtheoutputvoltage()(A)isfixed(B)canberaised,canalsobereduced(C)(D)canonlyrisedowninthepowerelectronicdevices,powertransistoringeneral(state)(A)amplification(B)cutoff(C)saturation(D)switchinthesinewaveoscillator,phasevoltageandthefeedbackbetweentheoriginalinputvoltagedifferenceis()(A)(B)(C)degreesdegreesdegrees(D)TheanodevoltageofdomesticYSseriesfluorescentdigitaltube(for)(A)V(B)V(C)V(D)VinductancecoilsofH,whenthecurrentinsecondsfromAtoA,theelectromotiveforcegeneratedonthecoil(absolutevalue)(A)V(B)V(C)V(D)V:replyDianziFansThefloorThezenerdiodeisusingitsvoltamperecharacteristics(voltage)characteristics(A)positiveinitial(B)positiveconduction(C)reversebreakdown(D)coretransformerinsulatedwithsiliconsteellaminations,itsmainpurposeisto()(A)reducethestraylossandmagnetoresistance(B)decreasesreluctanceandcopperloss(C)reducethereluctanceandresistance(D)toreducemagneticresistanceandironlossmagnetmotorexpansioncompensationwindingsembeddedinthestatorcoremachine(the)tank,andisconnectedinserieswiththearmaturewinding,tocompensatethedirectaxisarmaturereactionflux(A)intheslotandasmall(B)and(C)introughtroughandsmall(D)large,mediumandsmallpowertransistoris(controldevice)(A)current(B)voltage(C)powerfrequency(D)TheelectronicswitchSRdoubleoscillographinthe"alternate"state,suitableforthedisplayofthesignalwaveform()(A)twolowfrequency(B)two(C)highfrequencyofalowfrequencyofahighfrequency(D)onthebasicpropertiesofthemagneticfieldofthefollowingerroris()(A)hasthepropertiesofmagneticpropertiesofmagneticfield(B)withforce(C)magneticfieldinteraction(D)fieldiscomposedofmoleculesJSSAtypetransistortesteristhemeasurementofsmallandmediumpowertransistorhparametersinlowfrequencyconditionandthecommonlyusedinstrument()(A)thebreakdownvoltage(B)powerdissipation(C)saturationcurrent(D)frequencycharacteristicTwo,todeterminetheproblem()theuseofanoscilloscope,thesignaltobemeasuredtoaccesstheYinputshaftendbutton"()keyselectionismainlybasedonthediameteroftheshafttodeterminethesectionsize()ingeneral,SBTtypesynchroscopes"scanexpansion"shouldbeplacedinthecorrectposition()theoilhydraulicpumpheightshouldbegreaterthanmm()magneticcircuitandcircuit,withtheopenstate()thepowertransistorisinusetopreventthetwobreakdown()JSSAtypepowertransistorhparametertestercanoutputvoltsvoltagesuppliedtothesignalsourceandparameterindicator()isthetwodualtraceoscilloscopesignaltobemeasuredwithelectronicswitch,constantlyturnintoordinaryoscilloscopetubeinturndisplay()tocalculatethediameterofbeltwheelisVbeltwheeldiameter()mechanicaloilisoilforgeneralmachinery,withoutanyadditivesinmineraloil:replyDianziFansThefloor()CNCmachinetoolsinlineprocessing,aLilinearslopeunchanged,whilethetwospeedcomponentthanDeltaVYiDeltaVXichanging()tosimplifythebinarynumberbeforetheintroductionofsixteenhexadecimalnumber,infact,themachinecannotdirectlyidentifysixteenhexadecimalnumber()themainbronzebearingbushes,alsocando()PLCprogrammablecontrollerinputpartistocollectinformationofthecontroldeviceoroperatinginstructions()accordingtothetrajectoryofCNCmachiningcentermachinetooldivision,whichbelongstothecontourcontroltypeofCNCmachinetools()permanentmagnettypetachometergeneratorstatormadeofpermanentmagnetforsalientpole()toimprovethequalityofworkersistoshortenthebasictime,animportantguaranteetoimprovelaborproductivity()thesizeofbevelgeariscalculatedonthebasisoftheparametersofthebigtoothed()aseparatelyexcitedDCservomotorandpermanentmagnettwo,itsspeediscontrolledbyasignalvoltage()dragdevicevoltagetypeinverterissuitablefornotstarting,brakingandreverseThree,shortanswerquestionsEightyoneWhatarethemaincharacteristicsofbalancedreactorcontrolledrectifiercircuitofdoublereversestarTheprincipleofChopperDCmotorTheOhmlawcontent,andexplainthereluctanceofsinglephasetransformercoremagneticcircuitinsizefromwhatdecisionwhatistheservomotorThereareseveraltypesWhatarethecharacteristicsDCmotorcommutationcircuitfault,howtorepairAnswerAchoiceDBACABBCBDDDBBCBDDBADCDBACDBCBCDBCCACABABBAAB:replyDianziFansThefloorADCDDADCDDCABDCTwo,todeterminetheproblem**tickticktickVxtickticktick*ticktickticktick*ticktickticktickThree,shortanswerquestionsInthedoublereversestarcircuit,twogroupsofthreephasehalfwavecircuitandparallel(points),thedegreeofpulserectifiervoltagewaveformsmorethanthreephasehalfwavesmall(points)Thetwogroupsofstartransformerineachphase(points),whileconductingDCmagneticpotentialoffseteachother,thereisnoproblemofDCmagnetization(points)Theloadcurrentalsoconsistsoftwothyristorandtwowindingsbear(points)Soyoucanusethecurrentquotaofsmallercomponents(points),thetransformercanalsouseasmallcapacity(points)bytheDCmotorspeedformulan=(UIaRa)Ce(),wecanseethatthechangeofthesupplyvoltageUcanachievethepurposeofspeed(points)Thechopperistubeorselfoffelementtorealizeonoffcontrolusingthyristor(points),theDCpowersupplyinterruptedtoDCmotor(),bychangingtheonofftimetochangetheaveragevalueoftheloadvoltage,therebychangingthemotorspeed(points)inamagneticcircuit,themagneticfluxandmagneticfluxisproportionaltothesizeofthepotential,withthemagnetresistanceisinverselyproportionalto(points)Theaveragelengthandthesizeofthemagneticreluctanceofthemagneticcircuitofproportional(points),andtheproductofthecorematerialpermeabilityandcoreareaisinverselyproportionalto(points)servomotorisalsoknownastheexecutivemotorintheautomaticcontrolsystem,usedfortheimplementationofcomponentsofthereceivedsignalisconvertedtothemotorshaftangulardisplacementorangularvelocityoutput(points)DCandACservomotorisdividedintotwocategories(points)Itscharacteristicis:whenthesignalvoltageiszeronorotationspeed,withuniformtorquedecreased,canreceivethesignalquicklystarting,lossofsignalselfbraking,andthespeedandthesizeofthecontrolsignalisproportionalto(points)Thepieceofshortcircuitbetweenthepiecesinthetrenchisscrapmetal,brushpowderorotherconductivematerialfilled,causedshortcircuitbetweenplates(points),therefore,mustremovetheseconductivematerial,micapowderandcementfilledditchdepthshouldbe~mm(points)Ifthepatchinsulationbreakdowncausedbyshortcircuit,mustopenthecommutator,replacetheinsulationFirst,fillintheblanksMeansofthreesecurity,basicprecautions:airdefense,physicaldefenseandantitechnologyThethreebasicelements,safetyprecautionsare:detection,delayandresponseThebasicstructureof,TVmonitoringsystemconsistsof:videotransmissioncontroldisplayResistance,SMDresistorisohms,colorringresistancetobidforasilverringofyellowbrownresistorresistanceisohms,markedwithyellowandpurpleorangegoldringoftheresistanceoftheresistanceisohms,computerhardwarebyCPUTheinternalmemoryandexternalmemory,inputandoutputdevices(IO)etc,executablefiles(ComandExe)inmemoryoftheworkflowis:()fromthecommandcomfilecallDOSexecfunction()establishHbytesinmemoryoftheprogramsegmentprefix()theexecutableloadmemoryfile,theComfileisexecuteddirectlytotheExefileissetaftertheexecutionThemaincharacteristicsofthe,thedatabasesystemistoachievedatasharing,reducedataredundancy,thedatamodel,thespecificdatahashighindependence,withaunifieddatacontrolfunction,accesscontrolsystembythecardreader,controller,electromagneticlock,identificationcardandacomputerTwo,choice,thesprinklersystem,setthestartofspraypumpactionvalue(A)A,B,lowerlimitpressureswitchpressureswitch,pressureswitchCoftheupperlimitandlowerlimitoftheupperlimitvalue,notD,forthelackoflightandnightlightingequipmentcannotbeinstalledinthearea,onlymonitorscenepositionorshift,optional(B)A,B,blackandwhitecolorcameracamera,theroleofthephotoelectriccoupler(A)A,B,C,isolationamplifierdriverD,buffer,thelensaperturediameter(D)andthefocallengthofthelens(f)rationumericalapertureissmaller,larger,lightpenetration(A)A,theB,thelessC,nochange,themultimeterisusedup,switchtotheposition(B)A,dcgearB,highvoltageC,lowvoltageD,Ohmgear,thelifeofthepumpusingthyristorinverter,Theinverteroutputfrequencyishigher,themotorpumpspeed(A)A,theB,C,D,thesmallerthechangecannotbedetermined,thegeneralalarmandcommunicationcenterdistancecannotbemorethanmeters(A)A,meters,meters,BCD,meterstometers,averageonstatevoltagevalueisoneoftheindicatorstomeasurethequalityofthethyristor,thevalue(A)AB,thebiggerthebetter,thesmallerthebetter,moderatetogoodC,thebinarynumberisequaltothedecimalnumber(D)A,B,C,D,,carbondioxidegasfireextinguishingsystemconditions(C)A,B,smokealarmtemperaturealarmC,firstsmokeafterthetemperaturealarmD,firsttemperatureafterthesmokealarmThree,todeterminetheproblem,whenoneoftherectifierdiodesinglephasebridgerectifiercircuitisshortcircuited,numericaloutputvoltagewilldropbyhalfcircuitintoahalfwaverectifiercircuit(*),theclosedloopcontrolsystemwithnegativefeedbackcontrol,inordertoimprovethehardnessofmechanicalpropertiesofthesystem,expandtherangeofspeed(V)Singlephasebridgerectifiercircuit,afiltercapacitor,theoutputvoltageofthetransformerdependsontheaveragevalueoftwotimestheeffectivevalueofvoltageindependentoftheloadsize(*),usingtheoscilloscopesignal,themeasuredsignalmustpassaspecialprobeintooscilloscope,withoutprobecanmeasure(*),inalogiccircuitwithpositiveandnegativelogicpoints,whenusing""high,""indicatesalowlevel,calledpositivelogic,otherwiseknownasnegativelogic(V),thedynamicresistanceofdiodesizevarieswithcurrentthroughthediode,isnotfixed(V)equivalentcircuit,singlejunctiontransistoriscomposedofadiodeandthetworesistor,sochooseasuitablediodesandtworesistorsconnectedcorrectly,canbeusedtoreplacethesinglejunctiontransistor(*),amplificationoftheamplifierisaccordingtothechangeofvolume,themagnificationistheratioofthechangeinoutputsignal(V),theclosedloopcontrolsystemwithnegativefeedbackcontrol,inordertoimprovethehardnessofmechanicalpropertiesofthesystem,expandtherangeofspeed(V),theopenloopsystemforthespeedofchangeisnotcausedbyloadchangesofselfregulation,buttheexternaldisturbanceisselfregulating(*)Four,terminology,SCRAnswer:SCRisahighpowerrectifiermodel,anditdiffersfromordinarysiliconrectifieristherectifiervoltagecanbecontrolledwhentheACvoltagesupplyrectifiercircuitwhentheoutputvoltagecanbeadjusteduniformlyFive,questionIn,thesinglephasebridgerectifiercircuit,ifthereisatwotubeshortcircuit,opencircuitorreverse,whathappensAnswer:inthesinglephasebridgerectifiercircuit,ifthereisadiodeshortcircuit,willbecomehalfwaverectification,theotherhalfwavepowersupplycircuitifthereisadiodecircuitbreaker,itwillformahalfwaverectifier,ifthereisareversediode,Thecircuitnotrectification,nocurrentflowsthroughtheload,bymeasuringtheparameterscanbeidentifiedinthewayofwhattheworkingstatusofthetransistor(onlycommonemitter,aresistancecapacitancecouplingcircuit)Answer:themostsimpletransistorcanbedeterminedbythevalueofVcediscriminant,Thatis:ifVce=,thepipeworkinthesaturatedstatethroughIftheVbeVceEc,canbeconsideredinamplificationIfVce=VEc,inthecutoffregionoftransistorHere(Ecsupplyvoltage)

用户评价(0)

关闭

新课改视野下建构高中语文教学实验成果报告(32KB)

抱歉,积分不足下载失败,请稍后再试!

提示

试读已结束,如需要继续阅读或者下载,敬请购买!

文档小程序码

使用微信“扫一扫”扫码寻找文档

1

打开微信

2

扫描小程序码

3

发布寻找信息

4

等待寻找结果

我知道了
评分:

/23

弱电基础知识(The basic knowledge of the weak)

VIP

在线
客服

免费
邮箱

爱问共享资料服务号

扫描关注领取更多福利