液压与气压传动试题集

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1、液压与气压传动试题集Two,thechoice(onepoint,onepoint,15points)Thepressureonthehydraulicsystemismadeupof(A).Aloaddeterminestheratedpressureofthe〃Boverflowvalve"fortheChydraulicpump.Thehydrauliccontrolvalvecanbedividedintothreecategories,whichare(A).Apressurevalve/directionalvalve/flowvalveBo

2、ne-wayvalve/proportionalvalve/valveCballvalve/globevalve/gatevalveThemainreasonis(B)thatthesuctionportoftheexternalgearpumpislargerthanthepressureoil.ApreventstheoilfrombeingtrappedintheoilandtheCreducestheleakageofDandreducestheradialimbalanceThegearintheexternalgearpumpentersth

3、eengagedsideofthegear(B)・AsuctionoilcavityBpressureoilchamberCoilchamberorpressureoilchamber・(C)thethrottlecontrolcircuitcanwithstandnegativeloadAisintheBbypassCThethreefour-waycommutatorvalvefor(C)typecanbeunloadedinthemiddleposition.A0BPCMDYInthefollowingspeedcircuit,thecircuit

4、isthemostefficient・ThespeedadjustmentofthespeedadjustmentofthespeedofthecontrolofthespeedofthespeedadjustmentoftheDisbythespeedadjustmentofthespeedofAThehigh-pressuresystemshouldadopt(C)AgearpumpBpumpCplungerpump・Doubleoutofthehydrauliccylinder,thepistonbarisfixedandinstalled,the

5、movingareaoftheworkbenchistheeffectivestrokeofthecylinder(C)・Ais1timesB,2timesCis3timesD,4timesDThegovernorvalveiscomposedof(B)andthrottlingvalve・Apressure-reliefvalveCoverflowvalveDdifferentialpressurereliefvalveTheoilinthehydraulicdrive,theviscositywillbe(D)astheoiltemperaturer

6、ises・AconstantBisslightlyupandCisgoingupsignificantlyandDisgoingdownsignificantlyThehydraulicsystemisdesignedtopreventthehydraulicshockfromsetting(A)circuit・AleakpressureBplusCdecompressionWhenthepressure-pressurevariablepumpworkingpressureppB(pBpointpressure),thepumpoutputf1ow(B

7、)astheloadpressureincreases・AincreasesBlinearlyandthedecayofCisessentiallythesameasthatofthehyperbolaThethrottlevalveisinthrottlecontrolcondition,theleakagelossofthesystemandthedeviationoftheoverflowvalveareignored・Theoutputpowerofthepump(C)whenloadFincreases・AincreasesBandCisles

8、sconstantandDislikelytoincreaseordecreas