2015年电大计算机电路基础期末复习试题及参考答案资料参考

试卷代号座位号福建广播电视大学20122013学年度第二学期补修考试计算机科学与技术专业（本科）计算机电路基础（1）模拟试题2013年7月题号一二三四总分得分得分评卷人一、填空题（每空2分，共30分）1、在一个5的电阻上施加20V电压，该电阻吸收的功率是_W。2、把PN结外加正向电压时导通、外加反向电压时截止的特性称为_特性。3、稳压管工作在_向击穿状态。4、TTL或非门的多余输入端应接_电位。5、全加器是实现两个一位二进制数和_三个数相加的电路。6、8421BCD码的1011相当于十进制_的数值。7、三态门的输出状态包括低电位、高电位和_状态。8、或门的输入端为A、B，若要实现输出YA，则B端应该接_电位。9、组合逻辑电路_记忆功能。10、四个触发器组成的环形计数器最多有_个有效状态。11、有4个输入的译码器，最多可有_路译码输出。12、由真值表得到逻辑电路图的过程称为对逻辑电路的_过程。13、寄存器用来暂存二进制代码，在时钟脉冲作用下，能完成对数据的清除、接收、_和输出（或移位）。14、施密特触发器具有_稳定状态。15、PAL的与阵列是可编程的，或阵列一般是的。得分评卷人二、选择题（请将正确答案的序号填在横线上）（每小题3分，共30分）1、直流电路中，电感元件等效为_。A开路B短路C开路或短路视具体电路而定2、通常认为场效应管是一种_。A流控电压源型器件B压控电压源型器件C压控电流源型器件3、将二极管视为理想开关。是指其导通时_。A等效为高值电阻，截止时等效为低值电阻B等效为零值电阻，截止时等效为开路C等效为零值电流源，截止时等效为零值电压源4、CMOS传输门是由NMOS管和PMOS管_连接而成。A交叉耦合B串联C并联5、“或”运算和“异或”运算相比，在它们的两个输入为_组合下，其结果是不同的。A两个输入皆为1B两个输入皆为0C两个输入中一个为0、另一个为16、在求一个函数的对偶函数时，需要进行_互换。A“逻辑乘”和“逻辑加”B“正逻辑”和“负逻辑”C“原变量”和“反变量”7、TTL与非门扇出系数的大小反映了与非门_能力的大小。A抗干扰；B带负载；C工作速度8、多路选择器的功能。A必定有地址端和数据端B必定有数据端，而不一定有地址端C必定有地址端，而不一定有数据端9、对组合电路设计的目的是为了_。A由真值表得到卡诺图B由真值表得到逻辑电路图C由逻辑电路图得到真值表10、互斥编码器_。A输入端只能有一个信号有效B输出端只能有一个信号有效C输出端给出优先权最高的那个输入端的代码得分评卷人三、简述题（每小题10分，共20分）1、写出求逻辑函数F对偶函数的规则。若某逻辑函数，DACBF写出的对偶函数表达式。F2、JK触发器，当其现态QN分别为0和1两种状态时，根据输入J、K的不同输入状态，试描述其次态QN1所处的状态。得分评卷人四、分析、计算题（本题共20分）1在图41电路中，已知R150、R2100；电源电压US10V、IS2A。求支路电压U的数值。图412、（10分）二进制计数器74LS161的功能表如表1所示；由74LS161组成的计数电路，如图42所示。表1图42要求（1）画出Q3Q2Q1Q0的状态转换图；（2）电路在进行稳定的计数功能后（一个循环计数过程之后）分析可实现几进制计数器功能。ETPLDRCP工作状态010111110010清零预置数保持保持计数福建广播电视大学20122013学年度第二学期补修考试计算机电路基础（1）模拟试题参考答案2013、07一、填空题（每空2分，共30分）1、80W2、伏安3、反4、低5、来自低位的进位信号6、117、高阻8、低9、没有10、411、1612、设计13、保存14、两个15、不可编二、选择题（每小题3分，共30分）1B2C3B4C5、A6、C7、B8、A9、B10、A三、简答题（每小题10分，共20分）1、写出求逻辑函数F对偶函数的规则。若某逻辑函数，DACBF写出的对偶函数表达式。F答对偶规则指出对于任意一个函数式，如果将式中的所有的“”换成“”，“”换成“”，“0”换成“1”，“1”换成“0”，就得到一个新的函数式F，F和F互为对偶式。DACB2、JK触发器，当其现态QN分别为0和1两种状态时，根据输入J、K的不同输入状态，试描述其次态QN1所处的状态。答11110XQXQ010X0NNNNNNJKJKQJJ当时，若，则次态；若，则次态；当时，若，则次态若，则次态；四、分析计算题（共20分）1在图2电路中，已知R150、R2100；电源电压US10V、IS2A。求支路电压U的数值。图2解用叠加定理（解法不唯一）U10100/50100667V分压U250/100501006667V（分流）UUU60V（10分）2、（10分）二进制计数器74LS161的功能表如表1所示；由74LS161组成的计数电路，如图42所示。表174LS161的功能表图42要求（1）画出Q3Q2Q1Q0的状态转换图；（2）电路在进行稳定的计数功能后（一个循环计数过程之后）分析可实现几进制计数器功能。答（1）状态转换图如下320101010101_（2）根据状态转换图可知，该电路可实现11进制计数功能。ETPLDRCP工作状态010111110010清零预置数保持保持计数请您删除一下内容，O_O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AFTEREARNINGHISSPURSINTHEKITCHENSOFTHEWESTIN,THESHERATON,SENSONTHEBUND,ANDASPRINKLINGOFOTHERTOPNOTCHVENUES,SIMPSONLUFINALLYGOTTHECHANCETOBECOMEHISOWNBOSSINNOVEMBER2010SORTOFTHESHANGHAIBORNCHEFMIGHTNOTACTUALLYOWNCALIFORNIAPIZZAKITCHENCPKBUTHEISINSOLECHARGEOFBOTHKITCHENANDFRONTOFHOUSEATTHISSINANMANSIONSSTALWART“ITSCERTAINLYARESPONSIBILITYTOBETHEHEADCHEF,ANDTHENTOHAVETOMANAGETHERESTOFTHERESTAURANTASWELL,“THE31YEAROLDTELLSENJOYSHANGHAI“INHOTELS,FOREXAMPLE,THESEJOBSARESTRICTLYDEMARCATED,SOITSAGREATOPPORTUNITYTOLEARNHOWABUSINESSOPERATESACROSSTHEBOARD“ITWASATASKTHATMANAGEMENTBACKINSUNNYCALIFORNIAEVIDENTLYFELTHEWASREADYFOR,ANDAVOTEOFCONFIDENCEFROMACOMPANYTHAT,TODATE,HASOPENED250OUTLETSIN11COUNTRIESANDFORADDEDPRESSURE,THESHANGHAIBRANCHWASALSOCPKSCHINADEBUT“FORSUREITWASABIGSTEP,ANDUNLIKEALLTHEIROTHERASIAOPERATIONSTHATAREFRANCHISES,THEYDECIDEDTOMANAGEITDIRECTLYTOBEGINWITH,“SAYSSIMPSONTWOYEARSAGOAPRIVATEFRANCHISEETOOKOVERTHELEASE,BUTTHELINKSTOCPKHEADQUARTERSARESTILLSTRONG,WITHAMAINLANDBASEDBRANDAMBASSADORONHANDTOENSURETHEBUSINESSADHERESTOITSETHOSOFCREATING“INNOVATIVE,HEARTHBAKEDPIZZAS“,ASLICEOFPRBLURBTHATSIMPSONINSISTSLIVESUPTOTHEHYPE“THEYAREVERYINNOVATIVE,“HESAYS“THEPROBLEMWITHMOSTFASTFOODPLACESISTHATTHEYUSETHESAMESAUCEONEVERYPIZZAANDJUSTCHANGETHETOPPINGSEVERYONEOFOUR16PIZZASAUCESISAUNIQUERECIPETHATHASBEENFORMULATEDTOCOMPLEMENTTHETOPPINGSPERFECTLY“THELARGELYLOCALCUSTOMERBASEEVIDENTLYAGREESANDONSATURDAYANDSUNDAY,ATLEAST,THEPLACEISTEEMINGTHEKIDSEATFORFREEPOLICYATWEEKENDSISUNDOUBTEDLYABIGDRAW,ASWELLASISTHESPACIOUSSECONDFLOORLAYOUTOVERLOOKEDBYACANOPYOFGREENFROMFUXINGPARKOVERTHEROADTHECOMPANYISALSOFOCUSINGONINCREASINGBRANDRECOGNITIONANDINRECENTYEARSHASTAKENPARTINOUTSIDEEVENTSSUCHASTHEREGULARCALIFORNIAWEEKSTILL,THESTAAREHONESTENOUGHTOADMITTHATBUSINESSCOULDBEBETTERASGOOD,INFACT,ASINCPKSSECONDOUTLETINTHEPOPULARKERRYPARKSIDESHOPPINGMALLINPUDONG“SINANMANSIONSHASREALLYSTRUGGLEDTOGETTHENUMBEROFVISITORSTHATWEREENVISAGEDWHENITFIRSTOPENED,ANDITHASNTBEENEASYFORANYOFTHETENANTSHERE,“ADDSSIMPSON“WEREPLANNINGATHIRDOUTLETINTHECITYIN2015,ANDWEWILLPROBABLYCHOOSEASHOPPINGMALLAGAINBECAUSEOFTHEBETTERFOOTTRAFFIC“THETEAROOMSONCEFREQUENTEDBYCOCOCHANELANDMARCELPROUSTAREUPPINGSTICKSANDCOMINGTOSHANGHAI,XUJUNQIANVISITSTHEPARISIANOUTPOSTWITHSWEETTREATSONETHINGTHECENTURYOLDPARISIANTEAROOMANGELINAHASSHOWNISTHATLEGENDARYFASHIONDESIGNERCOCOCHANELNOTONLYHADSTYLEANDGLAMORBUTALSOBOASTEDGREATTASTEINFOOD,PASTRIESINPARTICULARONEOFTHEMOSTPOPULARTEAROOMSINPARIS,ANGELINAISFAMOUSFORHAVINGONCEBEENFREQUENTEDBYCELEBRITIESSUCHASCHANELANDWRITERMARCELPROUSTNOWANGELINAHASPACKEDUPITSFRENCHAMBIENCE,EFFICIENTSERVICE,ANDBEAUTIFUL,COMFORTINGDESSERTSANDFLOWNTHEMTOSHANGHAIATTHEFLAGSHIPDINEINANDTAKEOUTSPACEINSHANGHAI,EVERYTHINGMIMICSTHEORIGINALTEAROOMDESIGNEDFROMTHEBEGINNINGOFTHE20THCENTURY,INPARIS,THEHEIGHTOF“BELLEEPOQUE“THEPAINTINGSONTHEWALL,FOREXAMPLE,AREEXACTLYTHESAMEASTHEONETHATDEPICTSTHELANDSCAPEOFSOUTHERNFRANCE,THEHOMETOWNOFTHEOWNERANDTHESMALLTABLESAREINTENTIONALIMITATIONSOFTHEONESTHATCOCOCHANELONCESATATEVERYAFTERNOONFORHOTCHOCOLATETHEFAMOUSHOTCHOCOLATE,KNOWNASLAFRICAIN,ISALUXURIOUSMIXTUREOFFOURTYPESOFCOCOABEANSIMPORTEDFROMAFRICA,BLENDEDINPARISANDTHENSHIPPEDTOSHANGHAIITSSINFULLYSWEET,RICHANDTHICKASIFPUTTINGABAROFMELTINGCHOCOLATEDIRECTLYONTHETONGUEANDTHEFRESHWHIPPEDCREAMONTHESIDEMAKESALIGHT,BUTEQUALLYGRATIFYINGCONTRASTITISALSOSOLDINGLASSBOTTLESASTAKEAWAYTHESIGNATUREMONTBLANCCHESTNUTCAKECONSISTSOFTHREEPARTSTHEPUREEDCHESTNUTONTOP,THEVANILLACREAMLIKESTUFFING,ANDTHEMERINGUEASBASEGETALLTHREELAYERSINONESCOOP,NOTONLYFORTHEDIFFERENTTEXTURESBUTALSOVARIOUSFLAVORSOFSWEETNESSTHEDESSERTHASMAINTAINEDITSPOPULARITYFORACENTURY,EVENINACOUNTRYLIKEFRANCE,PERHAPSTHEWORLDSMOSTCOMPETITIVEPLACEFORDESSERTSAMUCHOVERLOOKEDPAIRING,ISTHEPARISNEWYORKCHOUXPASTRYANDN226CHOCOLATEFLAVOREDTEATHECHOUXPASTRYISAMOUTHFULOFAIRYPECANFLAVOREDWHIPPEDCREAM,WHILETHETEA,ABLENDOFBLACKTEASFROMCHINAANDCEYLON,COCOAANDROSEPETALS,OFFERSAMORESUBTLEFRAGRANCEOFFLOWERSANDCHOCOLATEORDERINGTHESETWOITEMS,FEATURINGAMUTEDSWEETNESS,MAKESITEASIERFORYOUTOFITINTOYOURLITTLEBLACKDRESSBREAKFAST,BRUNCH,LUNCHANDLIGHTSUPPERAREALSOSERVEDATTHETEAROOM,“AHUBOFMANYCULTURES“ANDTAKESIN“AMIXOFDIFFERENTSTYLESOFFRENCHCUISINES“,ACCORDINGTOTHEMANAGEMENTTEAMTHESEMICOOKEDFOIEGRASTERRINE,ISSEDUCTIVEANDDECEPTIVEITSGENEROUSLYSERVEDATTHESIZEANDSHAPEOFATOAST,WHILETHEACTUALBRIOCHETOASTISBAKEDINTOACURVEDSLICEDIPPEDWITHFIGCHUTNEYTHEFLAVOR,HOWEVER,ISHONESTSTRONG,SMOOTHANDSUBLIMEANDYOUDONTACTUALLYNEEDTHETOASTFORCRUNCHINESSTHISISTHESEASONFORHIGHTEAS,WITHDAINTYCUPSOFFINECHINAANDLITTLEPASTRIESTHATAPPEALTOBOTHVISUALANDPHYSICALAPPETITESBUTTHEREISONEHIGHTEAWITHADIFFERENCE,ANDPAULINEDLOHFINDSOUTJUSTEXACTLYWHYITISSPECIALEARLGREYTEAANDMACARONSAREALLVERYWELLFORTHECRUCIALRECUPERATIVEBREAKINBETWEENINTENSIVEBOUTSOFHOLIDAYSEASONSHOPPINGANDFORTHOSEWHOPREFERSAVORYTOSWEET,THEREISSTILLTHESELECTIONOFCLASSICCHINESESNACKSCALLEDDIMSUMTOSATISFYANDSATIATEHIGHTEAISAMEALTOEATWITHEYEANDMOUTH,ANINBETWEENINDULGENCETHATSHOULDBELIGHTENOUGHNOTTOSPOILDINNER,BUTSUFFICIENTLYROBUSTTOTAKETHEEDGEOFFTHEHUNGERTHATSTRIKESHOURSAFTERLUNCHTHEAFTERNOONTEASPECIALATSHANGXIATTHEFOURSEASONSHOTELPUDONGHASJUSTTHERIGHTELEMENTSITISAPAMPERINGMEAL,WITHTOUCHESOFLUXURYTHATMAKETHEHIGHTEASESSIONATREATINITSELFWHOLEBABYABALONESAREBRAISEDANDTHENTOPPEDONASHORTCRUSTPASTRYSHELL,ASORTOFCHINESEVERSIONOFTHEWESTERNVOLAUVENT,BUTCLASSIEREVENCLASSIERISTHEDIMSUMSTAPLESHRIMPDUMPLINGORHARGOW,UPGRADEDWITHTHEADDITIONOFSLIVERSOFMIDNIGHTDARKTRUFFLESTHISISAMASTERTOUCH,ANDCHEFSIMONCHOI,WHOPRESIDESUNCHALLENGEDATSHANGXI,HASSCOREDAWINNERAGAINSWEETPRAWNSANDAROMATICTRUFFLESWHATSNOTTOLOVEHISMASTERFULCRAFTSMANSHIPISEXHIBITEDINYETANOTHERPASTRYASWEETPASTRYTHATISSHAPEDTOLOOKLIKEAWALNUT,BUTWHICHYOUCANPUTSTRAIGHTINTOTHEMOUTHITCRUMBLESIMMEDIATELY,ANDTHESLIGHTLYSWEET,NUTTYMORSELISSOEASYTOEATYOULLPROBABLYREACHSTRAIGHTFORANOTHERMYFAVORITEISTHEDESSERTTHATGOESBYTHENAMEYANGZHIGANLU,ORAMBROSIAFROMTHEGODSTHEHOTELCALLSITCHILLEDMANGOCREAMWITHSAGO,POMELOANDBIRDSNESTMADEWITHINGREDIENTSTHATRESONATEWITHEVERYFEMALESOULITDOESTASTELIKEAMBROSIA,WITHTHESWEETSOURFRAGRANCEOFTHEMANGOFORMINGTHEFIRSTLAYEROFTASTEANDSENSATION,ANDTHEPOMELOSACSANDSA