福师《信号与系统》在线作业二

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1、福师《信号与系统》在线作业二Fushi"signal&system"onlineassignment2Testpaper13springtotalscore:100testtime:一SingletopicselectionTrueorfalse(50pointsfor25questions・)ThesystemfunctionofasystemisH(z)=z/[z~4)*(zT)_ifthesystemisastablesystem,itsconvergeneezoneis()・A.

2、z

3、<1B.

4、z

5、>41<

6、z

7、<4TheanswerisnoFullmarks:2F(s)

8、=10(s+2)/s*(s+5))theinitialvalueoftheinversetransformationis()・1A.B.010c.4D.Fullmarks:2Asystemwiththreecapacitors,twoinductorsandthreeresistors・Thefollowingstatementiscorrect()・A.ItmustbeAtwo-ordersystemB.Itmustbethe5thordersystemAtmost,itisatwo-stagesystemD.Atmost,the5thordersystemFullmarks:

9、2Thesystemofunitsequenceresponseh(n)二2u(n)isthesystem・A.causeandstabilityNotcausationandstabilityCausalityandinstabilityD.non-causalandunstableFullmarks:2Arectangularpulsesignal,whenthepulsewidthisdoubled,thepulsewidthisdoubled,andthebandwidthismorethantheoriginalbandwidth()・DoubledowndoubleA

10、.thesameNotsureFullmarks:2Thesignalf(t)二Acos(200PIt)cos(2000PIt)isequalto0.A.A*A/2B.A*A/4C.aquarterD.noneoftheanswersarecorrectFullmarks:2Thesystemofunitsequenceresponseh(n)二delta(n~5)isthesystem・A.causeandstabilityNotcausationandstabilityCausalityandinstabilityA.non-causalandunstableFullmark

11、s:2Thefinalvalueoff(s)二1/s+1/s+1(s+1)isequalto()・A.01B.2C.3D.Fullmarks:2Thefrequencyoff(t)is200hz,sotheNyquistfrequencyoff(-2t-6)is()・A.400hzB.200hzC.800hzA.100hzFullmarks:2Thedecomponentofthecosinefunctionf(t)=K(1t))isequalto()・A.0B.K/2,C.k.D.PI.Fullmarks:2Thesignalf(t)二Asin(500PIt)cos(2000P

12、It)0.A.A*A/2B.A*A/4C.aquarterD.noneoftheanswersarecorrect+cos(omegaisequaltoFullmarks:2Discretesignalf(n)means().ThevalueofA.Niscontinuous,andthevalueoff(n)isanysignalThevalueofb.nisdiscrete,andthevalueoff(n)isarbitraryThevalueofC.Niscontinuous,andf(n)isacontinuoussignalD.Niscontinuous,andf(n

13、)isadiscretesignalFullmarks:2Theunitstepsignalu(t)andu(t)-u(t-tO)convolvedwith0.A.tu(t)Tu(t)-(t-tO)u(t一tO).(t~tO)u(t-tO)D.0Fullmarks:2Thesystemisthe()systemoftheunitsequenceresponseh(n)二delta(n+4).A.causeandstabilityNotcausationandstabilityCa