Process_Control_2009_05_18A__重庆大学自动化过控试卷.docx
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1、Byradiotransmissions.InacentralizedfaciIityWiIhdisplayedmeasurements.Throughpsychicpower.3.Thetransferfunctionderivedinthisexamplesecondorder.Why?(2points)fortheCSTR,sinseriesis(T)ThechemicalreactionrateissecondorderThegainissecondorderThemodelinvolvestwodynamicbalances命题人组题人审题人4.Selecttheoutputresp
2、onsewhichwouldresultfromasinglestepinputtoafirstordersystem.(2points)命题时间:教务处制5. Completethisstatement:Self-regulationis.(2points) Thetendencyofasystemtoattainsteady-statewithoutexternalcontrolbeingapplied. Thetendencyofanoutputvariabletoreturntoitsinitialvalueafteradisturbance.重庆大学ProcessControl课程试
3、卷B卷20082009学年第二学期中都一、BasicConcepts(30points)1Foreachcommonhouseholditem,decidewhetheritusesautomaticfeedbacktoachieveitsperformancegoals(2points) Themicrowaveiswonderfulfo,tnakingpopcornorreheatingf()d(Yes,orNo) Thehotwaterheaterisaconveniencethatprovideshotwaterwithoutwaiting(Yes,orNo) Thetoilettan
4、kstoreswater,whichcanbeusedtoflushthetoiletbowl;wearegladthatthetoilettankstoresthecorrectamountofwater.(Yes,orNo)2.Achemicalplantcanbeverylargeandinvolvemanyhundredstothousandsofsensorsandvalves.Howdotheplantpersonnelmonitorprocessbehaviorandadjustvalveopenings?(2points)Bywalkingaroundtheplant. Ate
5、rmappliedonlyto1iquidintanks. Apropertyofallsystemswithinherentpositivefeedback.6. Toderive(i.e.,obtain)thetransferfunctionsofaprocess,wecaneitheruse,or.(4points)7. WhenusingZiegler-Nicholsultimate-cyclemethod,youcansettheintegraltimeto,andthederivativetimetoifitisnotpossibletodisabletheintegralandd
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