雨课堂学堂在线学堂云Digital electronics(北京交通大学)单元测试考核答案

目录：Chapter1,DigitalConceptsChapter2,NumberSystems,Operations,andCodesChapter3,LogicGatesChapter4,BooleanAlgebraandLogicSimplificationChapter5,CombinationalLogicAnalysisChapter6,FunctionsofCombinationalLogicChapter7,Latches,Flip-Flops,andTimersChapter8,ShiftRegistersChapter9,CountersChapter10,DevelopmentSystem第1题Aquantityhavingdiscretevaluesis（）AadigitalquantityBananalogquantityCabinaryquantityDanaturalquantity第1题Thebinarynumber11011101isequaltothedecimalnumber（）A121B221C444D257第2题The1’scomplementof10111001is（）A01000111B01000110C11000110D10101010第3题Thebinarynumbercodeis1110101，thenitscorrespondingGraycodeis()A1001111B1001101C1001011D1001100CH3-quiz第1题TheoutputofanORgatewithinputsA,BandCisa1(HIGH)when(

).AA=1,B=1,C=1BA=0,B=0,C=1CA=0,B=0,C=0Danswers(a),(b),and(c)Eonlyanswers(a)and(b)正确答案：E第2题wheninputsisone

“1”

and1000

“0”

forXORgate,thenoutputis“1”?第3题Awaveformofa2-variableinputslogicgateisasthefollowing,pleasejudgethisis()logicgatewaveformAaNANDBaNORCanXNORDanANDCH4-quiz第1题Ifalogicfunction，thenits’

inversefuncation

第2题Thefollowinglogicexpressions,thehazard-freeoneisAF=B’C’+AC+A’BBF=A’C’+BC+AB’CF=B’C’+AC+A’B+BC+AB’+A’C’DF=A’C’+BC+AB’+A’B第3题Given

,

thecomplementofF:F'=AA+(BC)’+(D+E)’

BA’B’+AD’+A’C’+D’E’CA’B’+A’C’+D’D(A+B+C’+E’)D’第4题Foralogicalfunction,whichrepresentationasfollowsisoneandonlyAlogicexpressionBlogicdiagramCtruthtableDtimingdiagramCH5-quiz第1题IfwewanttouseanXNORgateasanInverter(NOTgate),thentheinputsofAandBshouldconnectasthe

AoneoftheAandBconnectto‘1’BoneoftheAandBconnectto‘0’CAandBconnecttogetherDcan’trealizeCH6-quiz第1题Aproductexpression

forallmintermsofalogicfunctionmustbe1.第2题Theoutputsignalof(

)circuitis1-out-of-Mcode.AbinarydecoderBbinaryencoderCseven-segmentdecoderDdecadecounter第3题Afull-adderischaracterizedbyAtwoinputsandtwooutputsBthreeinputsandtwooutputsCtwoinputsandthreeoutputsDtwoinputsandoneoutputCH7-quiz第1题Singlestableflip-flopandSchmidtflip-floparecommonlyusedpulsesignalshapingcircuits.第2题InaRSflip-flopbasedonNORgate,whenR=1andS=0,

flip-flopstateis().ASet1BSet0CRemainunchangedDUncertain第3题ForaNANDgateinpositivelogic,ifnegativelogicisadopted，thenNANDgatewillbechangedtoANXORgateBNANDgateCORgateDNORgate第4题Thepurposeoftheclockinputtoaflip-flopisto（）.AclearthedeviceBsetthedeviceCalwayscausetheoutputtochangestatesDcausetheoutputtoassumeastatedependentonthecontrolling(S-R,J-KorD)inputsCH8-quiz第1题Afour-levelshiftregisternowhasastatusof0111，thesubstateaftershifting1bittotherightis().A11or1011B1111or1110C1011or1110D11or1111第2题Numericalcomparatorandrepositoryarecombinatoriallogiccircuits.第3题Ntriggerscanformastorethatcanstore()bitsofbinarydigits.AN-1BNCN+1D2NCH9-quiz第1题When(),aJKflip-flopcanbecomeabitbinarycounter.AJ=K=0BJ=0,K=1CJ=1,K=0DJ=K=1第2题Concatenatingabase5counterwithabase10countergivesabase15counter.第3题Thenumberoftriggersrequiredtodesignabase17counterwithtriggersis().A2B3C4D5CH10-quiz