数字电子技术期末试卷.doc

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1、命题人：组题人：审题人：命题时间：教务处制学院专业、班年级学号姓名公平竞争、诚实守信、严肃考纪、拒绝作弊封线密重庆大学数字电子技术I(双语)课程试卷2006~2007学年第2学期开课学院：通信工程学院课程号：考试日期：考试时间：120分钟题号一二三四五六七八九十总分得分注：1.大标题用四号宋体、小标题及正文推荐用小四号宋体；2.按A4纸缩小打印I.Multiplechoice(1pts/ea,15ptstotal)1)HowistheinvalidstateproblemassociatedwiththeS-Rflip-flopoverc

2、ome?a)TheRterminaliseliminated.b)TheRinputisfedthroughaninverter.c)Asingleinputterminalisused(D).d)BothBandCarecorrect.2)Thisisthetimingdiagramfora2-input________gate.a)NANDb)ANDc)Exclusive-ORd)OR3)WhatisthemeaningofRAM,andwhatisitsprimaryrole?a)RandomAccessMemory;itismem

3、orythatisusedforshort-termtemporarydatastoragewithinthecomputer.b)ReadilyAvailableMemory;itisthefirstlevelofmemoryusedbythecomputerinallofitsoperations.c)RandomAccessMemory;itismemorythatcanbereachedbyanysub-systemwithinacomputer,andatanytime.d)ResettableAutomaticMemory;i

4、tismemorythatcanbeusedandthenautomaticallyreset,orcleared,afterbeingreadfromorwrittento..4)WhichruleofBooleanalgebradoestheexamplebelowrepresent?a)A+1=1b)A∙0=0c)A+0=Ad)A∙1=A5)Thecircuitshownbelowis________.a)decadecounterb)BCDcounterc)Johnsoncounterd)ringcounter6)Thecircu

5、itbelowismostlikelya________.a)full-adderb)demultiplexerc)multiplexerd)comparator7)Foranegative-logicpulse,thetrailingedgeisthe________.a)negative-goingedgeb)positive-goingedgec)HIGH-to-LOWtransitiond)fallingedge8)The2'scomplementofbinaryis________.a)b)c)d)9)Whichofthefol

6、lowingstatementsbestdescribestheoperationofanUP/DOWNSYNCHRONOUSCOUNTER?a)Thecountercanbereversed,butmustbeRESETbeforecountingintheotherdirection.b)Ingeneral,thecountercanbereversedatanypointinitscountingsequence.c)Thecountercancountineitherdirection,butmustcontinueinthatd

7、irectiononcestarted.d)Thecountsequencecannotbereversed,onceithasbegun,withoutfirstresettingthecountertozero.Figure5-110)WhichofthefollowinglogicexpressionsrepresentsthelogicdiagraminFig5-1?a)b)c)d)11)Foranidealdigitalpulse,transitiontimesare________.a)infinite;b)measuredb

8、etween0and90%oftheamplitude;c)measuredbetween10%to90%oftheamplitude;d)zero;12)Whenperformingbina