2015年电大《液压与气动》期末复习考试试题及答案资料参考小抄

电大液压与气动期末复习重点知识考试小抄一填空题（每空1分，共20分）1真空度的最大值不会超过个大气压。2将既无又的假想液体称为理想液体。3重力作用下静止液体的等压面是一族面。4理想液体伯努利方程中的三项分别是能、能和能，三者之和为常数。5溢流阀能使其压力保持恒定，减压阀能使其压力保持恒定。6节流调速回路即有损失，又有损失，故效率低。7液压马达的容积效率是其流量与流量的比值。8调速阀是由阀和阀串联构成的。9齿轮泵的泄漏有三条途径（1）泄漏；（2）泄漏；（3）泄漏。10将MA1的气体流动，称为流动，若MA1则为流动。二选择题（每题4分，共20分）1液压泵的总效率的表达式为（），式中V为泵的容积效率，M为泵的机械效率。ABCD2单杆活塞式液压缸差动连接，若定量泵的输出流量为20L/MIN，则无杆腔的进油量为（）。A20L/MINB30L/MINC40L/MIND50L/MIN3圆管中液流的流动状态的表达式即雷诺数为。ABCD4容积调速回路中的恒功率调速回路是由组成。A定量液压泵和变量液压马达B变量液压泵和定量液压马达C变量液压泵和节流阀D变量液压泵和液压缸5消声器是通过方法降低排气速度，达到降低噪声的目的。A减小阻尼，减小排气截面积B减小阻尼，增大排气截面积C增大阻尼，减小排气截面积D增大阻尼，增大排气截面积三画图题每题10分，共20分1双液压泵供油回路，其中1为低压大流量泵，2为高压小流量泵。1在虚线框内填入正确元件，并连接油路；（每框各2分）2简述该油源的工作原理。（4分）2画出节流阀进油路节流阀调速回路的速度负载（FL）特性曲线并分析其最大泵载能力FLMAX及回路效率C。四计算题（每题15分，共30分）1图示的液压回路中，已知液压缸的面积A1A3100CM2，A2A450CM2，负载F114000N，F24250N，单向阀开启压力PK015MPA，节流阀的压降P02MPA，试求（1）A、B、C点的压力各为多少（9分）（2）若液压缸速度135CM/S,24CM/S，求各缸的输入流量。（6分）2液压马达排量QM250ML/R，入口压力为98MPA，出口压力049MPA，其总效率M09，容积效率VM092，若输入流量为22L/MIN，求（1）液压马达的输出转矩；（2）液压马达的输出转速。五分析题（10分）图示之回路为实现“快进工进（1）工进（2）快退停止的动作循环回路，且工进（1）速度比工进（2）快工进一工进二试说明工作原理，列出电磁铁动作顺序表。模拟试题一一填空题112粘性，不可压缩3水平4压力，位，动5入口，出口6节流，溢流7理论，实际8减压，节流9轴向间隙，径向间隙，啮合处10亚声速，超声速二选择题1C2C3D4A5B三画图题1（1）（）当系统快速运动时，油路压力低，顺序阀关闭，二泵合流供油；当系统速度低，油路压力大时，顺序阀开，低压大流量泵卸荷，高压小流量向系统供油。2最大承载力回路效率四计算题1（1）列缸1的力平衡方程列缸2的力平衡方程2对缸12解液压马达的输出转矩液压马达的输出转速五分析题1YA，3YA带电快进泵3位4通阀左位缸无杆腔有杆腔回油液控单向阀13位4通阀左位缸无杆腔，差动连接，实现快进3YA断电，4YA带电一工进进油同上，有杆腔回油径调速阀A液压单向阀2油箱实现调速1YA带电，4YA断电二工进进油不变，有杆腔回油调速阀A调速阀B油箱由调速阀B调速，且应使B开口小于A阀，故。1YA断电，2YA通电快退泵3位4通阀右位液控单向阀1缸有杆腔回油从缸无杆腔3位4通阀右位油箱2YA断电原位模拟试题二一判断题（请在题后的（）内，正确画“，错误画“号，每题2分，共20分）1液体的体积模量越大，则液体抵抗压缩能力越强。（）2负的相对压力称为真空度。（）3液体中任何一点的压力、速度都不随时间变化，则液体作恒定流动。（）4单作用式和双作用式叶片泵都可以做变量泵。（）5单杆活塞式液压缸的差动连接可以提高活塞的运动速度，并使其输出推力增大。（）6液控单向阀与普通单向阀一样，允许油液沿一个方向流动，不允许反向倒流。（）7旁油路节流调速回路，只有节流功率损失，没有溢流功率损失。（）8容积调速回路是由定量液压泵与液压缸（或定量液压马达）所组成的调速回路。（）9液压与气压系统都是以流体做工作介质，所以二者完全相同。（）10信号动作线图法（简称XD线图法）是一种行程程序控制的设计方法。（）二填空题（每空2分，共20分）1液压系统分成四部分，即能源装置，元件，元件和辅助元件。2在液压技术中，压力与流量的乘积即为。3液体在管道中流动，存在压力损失和压力损失。4液压泵的理论流量是和的乘积。5使气流达到超声速流动，管道截面形状必须先后。6气动元件中的定值器是一种高精度的阀。三选择题（每题4分，共20分）1水力直径用式（）计算，式中A通流截面面积，X湿周。ABCD2真空度的计算式为（）。A真空度大气压力绝对压力B真空度绝对压力大气压力C真空度大气压力绝对压力D真空度绝对压力表压力3三位换向阀中位能实现液压泵卸荷的是（）。ABCD4容积节流调速回路由（）组成。A变量泵与定量马达B定量泵与变量马达C定量泵与节流阀D变量泵与节流阀5PN常数为多变过程气体状态方程，若为等温过程，则应（）。AN0，P常数BN，常数CN1，P常数DN，P常数四画图题（共10分画出实现三级调压的基本回路，并分析工作原理。五计算题（每题15分，共30分）1某轴向柱塞泵的理论流量为58L/MIN，输出压力10MPA，转速，容积效率09，机械效率09。求（1）泵的实际流量；（2）所需驱动电机功率。2泵从油箱吸油如图示，已知泵的流量Q32L/MIN，吸油管直径D25MM,泵吸入口距油面高H500MM，滤网上的压力损失P01X10PA，油液密度900KG/M，油的运动粘度20X10M/S。试求泵吸油处的真空度。一判断题1、2、3、4、5、6、7、8、9、10、二填空题1、控制，执行2、功率3、沿程，局部4、排量，转速5、收缩，扩大6、减压三选择题1B2C3D4D5C四画图题分析图示状态，由阀1调试系统压力，1YA带电，由阀3调试系统压力，2YA带电由阀2调试系统压力，但阀3、2调试压力阀1而阀3，阀2无限制。五计算题1解（1）泵的实际流量QP（2）驱动电机功率P2解（1）求管中流速（2）驱动电机功率P（3）列II断面伯努力方程（4）真空度请您删除一下内容，O_O谢谢2015年中央电大期末复习考试小抄大全，电大期末考试必备小抄，电大考试必过小抄AFTEREARNINGHISSPURSINTHEKITCHENSOFTHEWESTIN,THESHERATON,SENSONTHEBUND,ANDASPRINKLINGOFOTHERTOPNOTCHVENUES,SIMPSONLUFINALLYGOTTHECHANCETOBECOMEHISOWNBOSSINNOVEMBER2010SORTOFTHESHANGHAIBORNCHEFMIGHTNOTACTUALLYOWNCALIFORNIAPIZZAKITCHENCPKBUTHEISINSOLECHARGEOFBOTHKITCHENANDFRONTOFHOUSEATTHISSINANMANSIONSSTALWART“ITSCERTAINLYARESPONSIBILITYTOBETHEHEADCHEF,ANDTHENTOHAVETOMANAGETHERESTOFTHERESTAURANTASWELL,“THE31YEAROLDTELLSENJOYSHANGHAI“INHOTELS,FOREXAMPLE,THESEJOBSARESTRICTLYDEMARCATED,SOITSAGREATOPPORTUNITYTOLEARNHOWABUSINESSOPERATESACROSSTHEBOARD“ITWASATASKTHATMANAGEMENTBACKINSUNNYCALIFORNIAEVIDENTLYFELTHEWASREADYFOR,ANDAVOTEOFCONFIDENCEFROMACOMPANYTHAT,TODATE,HASOPENED250OUTLETSIN11COUNTRIESANDFORADDEDPRESSURE,THESHANGHAIBRANCHWASALSOCPKSCHINADEBUT“FORSUREITWASABIGSTEP,ANDUNLIKEALLTHEIROTHERASIAOPERATIONSTHATAREFRANCHISES,THEYDECIDEDTOMANAGEITDIRECTLYTOBEGINWITH,“SAYSSIMPSONTWOYEARSAGOAPRIVATEFRANCHISEETOOKOVERTHELEASE,BUTTHELINKSTOCPKHEADQUARTERSARESTILLSTRONG,WITHAMAINLANDBASEDBRANDAMBASSADORONHANDTOENSURETHEBUSINESSADHERESTOITSETHOSOFCREATING“INNOVATIVE,HEARTHBAKEDPIZZAS“,ASLICEOFPRBLURBTHATSIMPSONINSISTSLIVESUPTOTHEHYPE“THEYAREVERYINNOVATIVE,“HESAYS“THEPROBLEMWITHMOSTFASTFOODPLACESISTHATTHEYUSETHESAMESAUCEONEVERYPIZZAANDJUSTCHANGETHETOPPINGSEVERYONEOFOUR16PIZZASAUCESISAUNIQUERECIPETHATHASBEENFORMULATEDTOCOMPLEMENTTHETOPPINGSPERFECTLY“THELARGELYLOCALCUSTOMERBASEEVIDENTLYAGREESANDONSATURDAYANDSUNDAY,ATLEAST,THEPLACEISTEEMINGTHEKIDSEATFORFREEPOLICYATWEEKENDSISUNDOUBTEDLYABIGDRAW,ASWELLASISTHESPACIOUSSECONDFLOORLAYOUTOVERLOOKEDBYACANOPYOFGREENFROMFUXINGPARKOVERTHEROADTHECOMPANYISALSOFOCUSINGONINCREASINGBRANDRECOGNITIONANDINRECENTYEARSHASTAKENPARTINOUTSIDEEVENTSSUCHASTHEREGULARCALIFORNIAWEEKSTILL,THESTAAREHONESTENOUGHTOADMITTHATBUSINESSCOULDBEBETTERASGOOD,INFACT,ASINCPKSSECONDOUTLETINTHEPOPULARKERRYPARKSIDESHOPPINGMALLINPUDONG“SINANMANSIONSHASREALLYSTRUGGLEDTOGETTHENUMBEROFVISITORSTHATWEREENVISAGEDWHENITFIRSTOPENED,ANDITHASNTBEENEASYFORANYOFTHETENANTSHERE,“ADDSSIMPSON“WEREPLANNINGATHIRDOUTLETINTHECITYIN2015,ANDWEWILLPROBABLYCHOOSEASHOPPINGMALLAGAINBECAUSEOFTHEBETTERFOOTTRAFFIC“THETEAROOMSONCEFREQUENTEDBYCOCOCHANELANDMARCELPROUSTAREUPPINGSTICKSANDCOMINGTOSHANGHAI,XUJUNQIANVISITSTHEPARISIANOUTPOSTWITHSWEETTREATSONETHINGTHECENTURYOLDPARISIANTEAROOMANGELINAHASSHOWNISTHATLEGEND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