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1、电梯专业模拟试题（Elevatorprofessionalsimulationtestquestions）ElevatorspecialtySinglechoicequestion:1,hydraulicelevatorspeedisnotgreaterthan(1)m/s;2,centralizedarrangementofmultipleelevators,thecomputertoselectthebestwaytocontroltheoperationoftheelevatoristouse(g
2、roupcontrol)control;3(electrictraction)systemhasmotor,powersupply,speedfeedbackandspeedcontroldevice;4,tractionfriction(toosmall),resultingintractionbetweentheropeandwheelslide,thecaroutofcontrol,pronetodanger;5.Thepurposeoftheropewindingistomakethepulli
3、ngropewraptheangleofthetractionwheel;6,thelargestnumberofpassengerelevators,withenergysaving,highefficiency,driveandcontrolequipment,smallsizeandlightweight,etc.,is(frequencyconversion,variablepressureVVVF)speedregulationsystem;7,theelectromagneticbrakei
4、senergized(brake),power(brake);8.Whenbraking,thesidebrakeshoesshouldbetightlyandevenlyattachedtotheworkingsurfaceofthebrakewheel.Whenthebrakeisloose,itshouldleaveatthesametime.Thefourcornersareintermittent,andtheaveragetwosidesarenomorethan(0.7)mm;9.Thet
5、ractionwheelismadeofwear-resistant(ductileiron)material;10.Theratioofthepitchdiameterofthetractionwheeltothenominaldiameterofthetractionropeislessthan(40);11,wireropemodelis:8X19S+NF-13,thisropesharing(152)rootsteelwire;12,thenominaldiameteroftractionisn
6、otlessthan(8)mm;13,elevatortractionropeshouldbeminimal(2)root;14,fortheuseofmorethanthreesteelwireropetractiondrivelift,itsstaticloadsafetyfactorisnotlessthan(12);15.Thetensilestrengthoftheropeheadassemblyisnotlessthan(80)%ofthetensilestrengthofthewirero
7、pe;16,tractionropetensionandtheaveragevaluedifferenceshouldnotbegreaterthan(5)%;17.Thedistancebetweentheelevatorsandtheguiderailsofthehoistwayshallnotbegreaterthan(2,5)m;18,incalculatingthenumberofliftload,accordingtotheaveragequalityof(75)Kgcalculation;
8、19,noloadcarweightratio,heavyweight(light);20,thedoorlockhook,lockarmandmovingcontactactionshouldbeflexibleandreliable,intheelectricallockingaction,theminimumlengthoflockingelementisatleast(7)mm;21,thecornerofthebag(thegre
