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1、电气自动化 1.硅材料与锗材料的二极管导通后的压降各为多少？在温度升高后，二极管的正向压降，反向电流各会起什么变化？试说出二极管用途（举3个例子即可）硅材料二极管:导通电压约0.5~0.7V,温度升高后正向压降降低,反向电流增加.锗材料二极管:导通电压约0.1~0.3V,温度升高后正向压降降低,反向电流增加. 二极管主要功能是其单向导通.有高低频之分,还有快恢复与慢恢复之分,特殊的:娈容二极管,稳压二极管,隧道二极管，发光二极管，激光二极管，光电接收二极管，金属二极管（肖特基），，， 用途：检波，整流，限幅，吸收（继电器驱动电路），逆程二极
2、管（电视行输出中）．2.如何用万用表测试二极管的好坏？在选用整流二极管型号时，应满足主要参数有哪些？如何确定？ 3.在发光二极管LED电路中，已知LED正向压降UF=1.4V，正向电流IF=10mA，电源电压5V，试问如何确定限流电阻。 4.三极管运用于放大工作状态时，对NPN管型的，各极电位要求是：c极b极，b极e极，而对PNP管型，是c极b极，b极e极。 weldingproceduresofsteelpressurevesselNDT9JB/T4744-2000steelpressurevesselpro
3、ductsmechanicalpropertiestestofweldedplateII,mechanicalequipmentinstallationengineering1GB150-982GB50128-2005verticalcylindricalsteelpressurevesselsteelweldedspecificationforconstructionandacceptanceofoiltank3JB/T4735-1997steelweldedatmosphericpressurevessel4GB50231-2009mec
4、hanicalequipmentinstallationengineeringconstructionandacceptancespecificationfor5GB50275-98compressor,fanandpumpinstallationengineeringconstructionandacceptancespecificationforlifting6HG20201-2000constructioninstallationengineeringconstructionstandard7,HG...Pressuregauges,u
5、singaninstalledsparkarrestorforacetylenecylinders,illegalcarrying,usinggascylinders,eachoperatorfined20Yuan.Gasbottlewithoutthehotsunexposuremeasures,responsibilitiesofteamafineof50Yuan.(7)atheightandtheopeningandprovisionalprotectivemeasureshavebeentaken,theresponsibleunit
6、fined200Yuan,constructionpersoninchargeafineof50Yuan.(8)nopermittoworkandthejobinaccordancewiththeprovisions,onthejobunitfined300yuan,theunitwillchargeafineof100Yuan.7.5.3accidentpenalties(1)injuriesfatalitiesdirectlypunished1~2million.Directresponsibilityfortheaccidentandh
7、avethecorrespondingresponsibilityofleadership,suchasconcerningadministrativesanctions,shouldbebroughttothecompanyortherelevantDepartment.(2)personalinjuryaccidentoccurred,thedirectpunishment0.5-10,000yuan,responsibleforthedirectresponsibilityfortheaccidentandtheresponsibili
8、tyofleadership,suchasconcerningadministrativesanctionsshouldbedealtwithbytheperson
