数字电子技术期中考试

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1、PARTITrue/False(判断题)Answerquestions1-25byenclosingeithertheTrue(correct)ortheFalse(incorrect).Transferyouranswerstotheanswersheet.1.(True/False)Physicalquantitiessuchastemperature,pressure,andflow,areanalogquantities・2.(True/False)Inapositivelogicsystem,0isrepresentedbyaLOW

2、.3.(True/False)Aperiodicwaveformhasafrequencyof20kHzandapulsewidthof0.01ms.Thedutycycleis20%・4.(True/False)Atwo-inputlogicgatehasaHIGHononeinputandaLOWontheotherinput.TheoutputisHIGH.ItmustbeanORgate.5.(True/False)TheVscomplementof101010112is010101012.6.(True/False)11101IOO

3、2isthe2'scomplementrepresentationof-20.7.(True/False)3A1B,6=111010000110112.&(True/False)TheBCDequivalentof49is01110011.9.(True/False)30isequivalenttobinary00011110.10.(True/False)TheGraycodecorrespondingtobinary10101is11111.11・(True/False)ApositiveANDgateisfunctionallyequi

4、valenttoanegativeORgate.12.(True/False)BooleanadditionissymbolizedbyAB.13.(True/False)BooleanmultiplicationisthesameastheANDfunction.14.(True/False)AnXNORgatehasexactlytwoinputs.15.(True/False)TheassociativelawofBooleanmultiplicationstatesthat(AB)C=A(BC).16.(True/False)Thea

5、bsorptionlawstatesthatA+AB=B.17.(True/False)X=(A+B+C)(B+C+D)isintheformofasum-of-products(SOP)expression.18・(True/False)Theexpressions,ABCandA+B+C,areequivalent.19.(True/False)Afull-adderhastwoinputsandtwooutputs.20.(True/False)Signedbinarynumberscanalsobecomparedusingmagni

6、tudecomparators.21.(True/False)Adecimal-to-BCDencoderisdescribedby:+/9,=/4+/5+/6+/7,A二厶+厶+人+厶，A)=/l+/3+/5+/7+/9-When/3=/4=/5=/6=/7=/8=/9=0»A=Z2=1，4&4A)=0010.22.(True/False)Ademultiplexer(datadistributor)canbeimplementedusingadecoder.23.(True/False)Paritycheckerscandetecttwo

7、-biterrors・24.(True/False)Inorderforthedecimalnumber8tobedisplayedonacommon-cathodeseven-segmentdisplay,terminalsabedefgmustbeLOW.25.(True/False)ThePALisaPLDwithaone-timeprogrammableANDarrayandafixedORarray.PARTIIFillintheBlanks(填空题)Answerquestions26-35byfillinginthebanks.T

8、ransferyouranswerstotheanswersheet.26-Convert156.4375tobinary・156.4375=.27.Addthef