2015年电大汽车电工电子基础及电路分析作业1-3答案

一、填空题1、有甲灯220V60W和乙灯110V40W白炽灯，把他们串联后接到220V电源上时灯较亮；若把他们并联后接到48V电源上时灯较亮。2、交流电的最大值反映其变化范围，角频率（或频率、周期）反映其，初相角反映其。3、市用照明电的电压为220V，这是指电压的值，它的最大值为。4、稳压二极管工作处于区，在该区内，稳压管的电流在很大的范围内变化，却基本不变，这就是稳压管的稳压作用。5、串联负反馈能使放大器的输入电阻。6、射极输出器是典型的放大器。7、编码器的作用是。二、选择题1、在全电路中、负载电阻增大，端电压将（）A、增高B、减小C、不变D、不确定2、当硅稳压二极管稳压电路输出电流不够时，应该采用下面（）种做法。A、将两制相同型号的稳压二极管串联。B、将两制相同型号的稳压二极管并联。C、更换一只稳压值相同，功率更大的二极管。3、晶体三极管在放大交流信号时，其集电极电压（）A、只含有放大了交流信号B、只含有直流静态电压C、既有直流静态电压又有交流信号电压4、影响放大器工作点点稳定的主要因素是（）A、偏置电阻的阻值B、负载的变化C、交流旁路电容的容量D、温度5、负反馈改善了放大器的性能，但使放大电路的放大信数（）A、降低B、不变C、增加D、不确定6、下列电路中，具有记忆、计数功能的电路是（）A、单稳态电路B、运行放大电路C、多谐震荡器D、双稳态电路7、十序逻辑电路的输出与（）有关。A、只在当前的输入B、与当前的输入和原来的状态C、只与原来的状态D、与电源电压8、逻辑功能为输入有“O”时，输出就为“I”的门电路是（）A、车门B、或门C、与非门D、或非门9、晶体三极管按共发射极接法组成放大器工作时，其输出电流、输出电压在输入电压的相位关系是（）A、输出电流、输出电压均与输入电压相反B、输出电流、输出电压均与输入电压相反C、输出电流与输入电压相同，输出电压与输入电压相反三、判断题1、220V60W灯泡，若安在110V电源上使用，它的实际功率只有30W。（）2、当电路处于通路状态时，外电路电阻上的电压等于电源电动势。（）3、基尔霍夫第二定律只使用与闭合回路，在开口电路中还使用。（）4、串联反馈都是电流反馈，并联反馈都是电压反馈。（）5、计数器是一中组合逻辑电路。（）6、主从JK触发器的输出状态是在CP脉冲的下降沿到来时改变的。（）答案一、填空1、甲；乙；2、变化快慢；交变起点3、有效；311V；4、反向击穿；击穿电压UZ；5、增大；6、电压串联负反馈；7、二进制数码表示不同的信号二、选择题1、A；2、C；3、C；4、D；5、A；6、D；7、B；8、C；9、C三、判断题1、；2、；3、；4、；5、；6、；汽车电工电子基础及电路分析作业讲评（三）此门课为中央电大命题，根据命题要点出一些题目，仅供参考。计算题1电路如图所示，已知ES8V、IS1A、R11、R25、R33，用叠加定理求R3中的电流I。2右图所示电路中，设三极管的值为100，UBE07V，RBB200，C1和C2足够大，又知UCC10V，RB490K，RCRL3K。试求（1）静态时IBQ、ICQ、UCEQ；（2）计算RBE；（3）求电压放大倍数AU；（4）求输入电阻RI和输出电阻RO。R3ESR1IR2IS答案120V电压源单独作用时将5A电流源开路，如图所示。由此图可得I的一个分量为AI2805A电流源单独作用时将20V电压源短路，如图所示。由此图可得I的另一个分量为I15“两电源共同作用时；总电流IA“2132答（1），MARUIBC05241MAIBC2054VIE623（2），BELBELCIOURRRUA/KRLC263/10824BELUR（3），KRBEI7902KRIURCO3R25AR1I“R220VR1I请您务必删除一下内容，O_O万分谢谢2015年中央电大期末复习考试小抄大全，电大期末考试必备小抄，电大考试必过小抄INDONESIAHASEMERGEDASATOPVACATIONDESTINATIONFORCHINESETHISSUMMER,ALONGWITHTHAILANDSPHUKETISLANDANDTHEMALDIVESARCHIPELAGOENCOURAGEDBYGROWTHINCHINESETRAVELERSTOINDONESIA,THEGOVERNMENTINJAKARTAHASRECENTLYRELAXEDITSVISAPOLICYSINCEJUNE10,CHINESETOURISTSCANENTERINDONESIATHROUGHNINEAPPOINTEDLOCATIONS,INCLUDINGTHESOEKARNOHATTAINTERNATIONALAIRPORTINJAKARTA,THENGURAHRAIINTERNATIONALAIRPORTINBALIANDTHEKUALANAMUINTERNATIONALAIRPORTINMEDAN,BYJUSTGETTINGTHEIRPASSPORTSSTAMPEDONARRIVALOFFICIALLY,ITISCALLEDTHE“FREEVISA“SCHEMETHENEWPOLICYALSOMEANSCHINESETOURISTSCANSAVE35ONVISAFEES,WHICHWILLLIKELYMAKETRIPSTOINDONESIAMOREALLURINGWHILESUCHANARRANGEMENTALLOWSCHINESEVISITORSTOSTAYUPTO30DAYSFORTHEPURPOSEOFTRAVELING,THOSESEEKINGEXTENSIONSWILLNEEDTOGETPAIDVISASFROMTHATCOUNTRYSMISSIONSINBEIJING,SHANGHAI,GUANGZHOUORHONGKONG,ACCORDINGTOANOFFICIALATTHEINDONESIAEMBASSYINBEIJINGSANTODARMOSUMARTO,HEADOFTHEEMBASSYSINFORMATION,SOCIALANDCULTURALSECTION,SAYSTHENEWPOLICYISAIMEDATSTRENGTHENINGPEOPLETOPEOPLECONTACTSBETWEENTHETWOCOUNTRIESDAIYU,MARKETINGDIRECTOROFCTRIP,AMAJORCHINESEONLINETRAVELAGENCY,SAYS“WEVESEENANEARLY50PERCENTGROWTHOVERTHEPREVIOUSMONTHINTHENUMBEROFCHINESETOURISTSTOBALISINCETHEPOLICYWASANNOUNCED“DURINGHISTRIPTOCHINAINMARCH,INDONESIANPRESIDENTJOKOWIDODOPROPOSEDTHATHISCOUNTRYANDCHINAAIMTOINCREASETWOWAYVISITSTOAMAXIMUMOF10MILLIONPEOPLEINTHENEXTFEWYEARSTHEINDONESIANGOVERNMENTHASSETTHEIRSIGHTSONGREETING2MILLIONCHINESETOURISTSBYTHEENDOFTHISYEAR,ACCORDINGTOTHEOFFICIAL“THEINDONESIANGOVERNMENTHOPESTHATINDONESIANNATIONALSWOULDALSOBEGIVENPREFERENTIALTREATMENTWHILEVISITINGCHINA,“SAYSDARMOSUMARTOIN2013,THENUMBEROFCHINESETOURISTSWHOVISITEDINDONESIASTOODAROUND807,000LASTYEAR,ITINCREASEDTO959,000,HEADDSBALIREMAINSTHEMOSTPOPULARSITEAMONGCHINESETOURISTSINFEBRUARY,MORETHAN92,200CHINESETOURISTSMADETRIPSTOBALI,RANKINGFIRSTAMONGOVERSEASVISITORS,THEBALITIMESREPORTEDLASTYEAR,THEISLANDWITNESSEDMORETHAN586,000ARRIVALSFROMCHINA,ANINCREASEOF51PERCENTOVER2013“BALIISNTJUSTFORSIGHTSEEING,BUTALSOFORWEDDINGS,HONEYMOONS,GOLFANDMANYOUTDOORACTIVITIES,“SAYSFANWENQING,AMARKETINGEXECUTIVEATGARUDA,INDONESIASNATIONALAIRLINERGARUDAOFFERSTHREENONSTOPFLIGHTSBETWEENBEIJINGANDBALI,ANDFOUREACHWEEKBETWEENBEIJINGANDJAKARTATHEREAREDAILYFLIGHTSFROMGUANGZHOU,INGUANGDONGPROVINCE,ANDSHANGHAITOJAKARTAASWELLITTAKESFROMSIXTOEIGHTHOURSONANONSTOPFLIGHTTOREACHINDONESIAFROMCHINAINDONESIAISHOMETOMORETHAN17,000ISLANDSTOURISTSCANTOURYOGYAKARTATOSEEPRAMBANAMANDBOROBUDUR,TWOHISTORICALANDRELIGIOUSSITES,ANDEXPLORETHELOCALHANDICRAFTMARKETSTHEBASEOFAVOLCANO,BANDUNG,WHICHISALSOKNOWNASTHE“PARISOFJAVA“,ISIDEALFORADVENTURESEEKERSMANYECOTOURISMDESTINATIONS,SUCHASTOBALAKEINSUMATRA,TANJUNGPUTINGNATIONALPARKINKALIMANTANANDBUNAKENINMANADO,AREPLACESTHEEMBASSYOFFICIALRECOMMENDSFORTOURISTSINDONESIABOASTSWORLDCLASSSURFINGFACILITIESALONGTHESHORESOFSUMATRADOWNTONUSATENGGARAISLANDSRECENTLY,LOMBOK,ASISTERISLANDEASTOFBALIHASGOTTENSOMUCHATTENTIONFROMCHINESETRAVELERSTHATSOMETRAVELAGENCIESAREOFFERINGTWINPACKAGESFORBALIANDLOMBOKTHEBESTTIMETOVISITBALIISFROMMAYTOOCTOBER,WHENITDOESNTRAINMUCHANDTHEWEATHERISCOOLATPRESSTIME,AWEEKLONGPACKAGEFROMSHANGHAIORGUANGZHOUTOBALIWASALITTLEMORETHAN3,000YUAN480ONCTRIPSWEBSITECHINESETOURISTSHAVETAKENASHINETORAFTINGINUBUD,SIGHTSEEINGINTANAHLOT,ANDSURFINGANDDIVINGINNUSALEMBONGAN,SAYSDAICIVETCOFFEE,ESSENTIALOILANDWOODCARVINGSAREAMONGTHEMOSTPOPULARPRODUCTSFORCHINESETOURISTSININDONESIA,SHESAYSINDONESIANF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