【答案】《机械设计(英)》(北京理工大学)章节期末中国大学慕课答案_第1页
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2.摩擦、磨损与润滑Friction、WearandlubricationQuizforTribology1.单选题:Incontactmechanics,onlyasmallpercentageofthenominalareaactuallycontactsdueto:在接触力学中,名义接触面积实际只有很小一部分发生接触,原因是:

选项:

A、Thermalshrinkage热缩

B、Micro-asperities微凸起存在

C、Surfacecolorchange表面变色

D、Magneticrepulsion磁斥

答案:【Micro-asperities微凸起存在】2.单选题:Whatisthedefinitionoffailureinmechanicalcomponents?机械零件中的“失效”指的是:

选项:

A、Completefractureonly仅限完全断裂

B、Temporarymalfunction临时故障

C、Anyconditionwherefunctioniscompromised任何功能受损的情况

D、Surfacediscoloration表面变色

答案:【Anyconditionwherefunctioniscompromised任何功能受损的情况】3.单选题:Whatistheapproximaterealcontactratioofmetalsurfacesunderload?两金属表面受载时真实接触面积约为名义面积的:

选项:

A、100%

B、50%

C、10–30%

D、0.01%–1%

答案:【0.01%–1%】4.单选题:Whatisthemaincauseoffailureby“wearingout”?

选项:

A、Electricaloverload电流过载

B、Surfacedegradation表面退化

C、Softwarefailure软件故障

D、Internalcorrosion内部腐蚀

答案:【Surfacedegradation表面退化】5.单选题:WhichofthefollowingisNOTafunctionoflubrication?

选项:

A、Reducefrictionandwear降低摩擦与磨损

B、Powertransmission功率传递

C、Increasecontactpressure增加接触压力

D、Coolingandcleaning冷却与清洁

答案:【Increasecontactpressure增加接触压力】6.单选题:Whatpropertymustalubricantpossess?

选项:

A、Highshearstrength高剪切强度

B、Lowcompressivestrength低抗压强度

C、Highcompressivestrength高抗压强度

D、Electricalconductivity良好导电性

答案:【Highcompressivestrength高抗压强度】7.单选题:Whichtypeoflubricationinvolvessignificantasperitycontact?

选项:

A、Hydrodynamiclubrication液体动压润滑

B、Boundarylubrication边界润滑

C、Mixedlubrication混合润滑

D、Fullfilmlubrication全膜润滑

答案:【Boundarylubrication边界润滑】8.单选题:Whichviscosityunitconversioniscorrect?

选项:

A、1P=10Pa·s

B、1cP=1mPa·s

C、1St=1m²/s

D、1Pa·s=0.1P

答案:【1cP=1mPa·s】9.单选题:Whichweartypecanoccurevenwithfulllubrication?即使充分润滑也可能发生的是哪种磨损?

选项:

A、Adhesivewear黏着磨损

B、Abrasivewear磨粒磨损

C、Fatiguewear疲劳磨损

D、Corrosivewear腐蚀磨损

答案:【Fatiguewear疲劳磨损】10.单选题:Accordingtoclassicaltheory,whichofthefollowingistrue?根据经典理论,下列哪项是正确的?

选项:

A、Staticfrictionislessthankineticfriction静摩擦小于动摩擦

B、Kineticfrictionincreaseswithvelocity动摩擦随速度增加

C、Staticfrictionisslightlygreaterthankineticfriction静摩擦略大于动摩擦

D、Frictiononlyexistswhenmotionoccurs只有运动时才有摩擦

答案:【Staticfrictionisslightlygreaterthankineticfriction静摩擦略大于动摩擦】11.单选题:Inadhesivefrictiontheory,thefrictionforceisprimarilycausedby:在黏着摩擦理论中,摩擦力主要由下列哪一因素引起?

选项:

A、Magneticrepulsion磁斥力

B、Shearingofadheredasperities剪切附着的微凸体

C、Surfacetemperaturegradients表面温度梯度

D、Surfaceroughnesschanges表面粗糙度变化

答案:【Shearingofadheredasperities剪切附着的微凸体】12.单选题:Accordingtoadhesivetheory,frictioncoefficientfordrymetalsis:根据粘着理论,干燥金属的摩擦系数大致为:

选项:

A、0.01–0.05

B、0.1–0.3

C、0.3–0.8

D、1.0–1.5

答案:【0.3–0.8】13.单选题:Whichtypeoflubricationinvolvessignificantasperitycontact?

选项:

A、Hydrodynamiclubrication液体动压润滑

B、Boundarylubrication边界润滑

C、Mixedlubrication混合润滑

D、Fullfilmlubrication全膜润滑

答案:【Boundarylubrication边界润滑】14.单选题:Whichviscosityunitconversioniscorrect?

选项:

A、1P=10Pa·s

B、1cP=1mPa·s

C、1St=1m²/s

D、1Pa·s=0.1P

答案:【1cP=1mPa·s】15.单选题:Whichofthefollowingbestdescribestherunning-inprocess?下列哪项最准确描述“磨合过程”?

选项:

A、Nomateriallossoccursduringit过程中没有材料损失

B、Itcausespermanentfailure导致永久失效

C、Itallowssurfaceasperitiestoadaptforsmootheroperation表面微凸体适配以实现更平稳运转

D、Iteliminatesfriction消除摩擦

答案:【Itallowssurfaceasperitiestoadaptforsmootheroperation表面微凸体适配以实现更平稳运转】16.单选题:Abrasivewearoccurswhen:磨粒磨损发生的条件是:

选项:

A、Twosimilarhardnessmaterialscontact接触材料硬度相近

B、Softparticlesfloatbetweensurfaces软颗粒悬浮于表面之间

C、Onesurfaceismuchharderandscratchestheother一方表面显著更硬并划伤另一方

D、Lubricationbuildsup形成润滑

答案:【Onesurfaceismuchharderandscratchestheother一方表面显著更硬并划伤另一方】17.单选题:Accordingtotheplowingmechanism,frictionarisesbecause:

选项:

A、Particlesmeltduringcontact接触过程中颗粒熔化

B、Intermolecularbondsbreak分子键断裂

C、Asperitiesdigintoanddeformtheopposingsurface微凸体切入并变形对方表面

D、Surfaceshavematchingcurvature表面曲率一致

答案:【Asperitiesdigintoanddeformtheopposingsurface微凸体切入并变形对方表面】18.单选题:Whichofthefollowingstatementsaboutmicrofrictiontheoryiscorrect?

选项:

A、Frictiondisappearscompletelyonatomicallysmoothsurfaces

B、Frictioniscausedbysurfaceoxidation

C、Frictionisformedbyintermolecularchargeinteractions

D、Frictionincreaseswithcolorcontrast

答案:【Frictionisformedbyintermolecularchargeinteractions】19.单选题:Whathappensintherealcontactareaunderhighlocalstressinadhesivetheory?

选项:

A、Elasticrebound弹性恢复

B、Localmelting局部熔化

C、Plasticdeformation局部塑性变形

D、Crackpropagation裂纹扩展

答案:【Plasticdeformation局部塑性变形】20.单选题:Whatiswear?

选项:

A、Suddenmaterialexplosion材料爆炸

B、Accumulationofdebris残渣堆积

C、Progressivelossofmaterialduetosurfacecontact由于接触导致材料逐渐损耗

D、Increaseinhardness硬度提升

答案:【Progressivelossofmaterialduetosurfacecontact由于接触导致材料逐渐损耗】21.单选题:Whatdoesthecoefficientoffrictionμrepresent?

选项:

A、Ratioofweighttoforce重力与力的比值

B、Ratiooffrictionforcetonormalforce摩擦力与法向力之比

C、Ratioofareatopressure面积与压强之比

D、Ratioofspeedtoacceleration速度与加速度之比

答案:【Ratiooffrictionforcetonormalforce摩擦力与法向力之比】22.单选题:Accordingtoadhesivetheory,frictioncoefficientfordrymetalsis:

选项:

A、0.01–0.05

B、0.1–0.3

C、0.3–0.8

D、1.0–1.5

答案:【0.3–0.8】23.单选题:Whatdoesmicrofrictiontheoryproposeasthecauseoffriction?

选项:

A、Surfaceoxidation表面氧化

B、Thermalexpansion热膨胀

C、Intermolecularforcesbetweensurfaces表面分子间作用力

D、Soundwavedissipation声波耗散

答案:【Intermolecularforcesbetweensurfaces表面分子间作用力】24.单选题:Inadhesivefrictiontheory,thefrictionforceisprimarilycausedby:

选项:

A、Magneticrepulsion磁斥力

B、Shearingofadheredasperities剪切附着的微凸体

C、Surfacetemperaturegradients表面温度梯度

D、Surfaceroughnesschanges表面粗糙度变化

答案:【Shearingofadheredasperities剪切附着的微凸体】25.单选题:WhichofthefollowingisNOTarequirementforfatiguewear?

选项:

A、Cyclicloading循环载荷

B、Surfacecontact表面接触

C、Materialstress材料受力

D、Loadrepetition载荷反复

答案:【Surfacecontact表面接触】26.单选题:Whichenvironmentismostlikelytocausecorrosionwear?

选项:

A、Ultra-dryvacuum极干燥真空环境

B、Inertgas惰性气体环境

C、Airwithmoistureandoxygen含湿气和氧气的空气

D、Purenitrogen纯氮气

答案:【Airwithmoistureandoxygen含湿气和氧气的空气】27.单选题:Themostcommonformofcorrosionis:

选项:

A、Cavitation腔蚀

B、Chemicalerosion化学腐蚀

C、Oxidation氧化

D、Microbialdegradation微生物侵蚀

答案:【Oxidation氧化】28.单选题:WhichofthefollowingisNOTavalidwaytoreducewear?

选项:

A、Improvesurfacehardness提高表面硬度

B、Useincompatiblematerials使用不相容材料

C、Lubricantfiltration润滑油过滤

D、Anti-dustsealing防尘密封

答案:【Useincompatiblematerials使用不相容材料】29.单选题:Whichofthefollowingbestdescribestherunning-inprocess?

选项:

A、Nomateriallossoccursduringit过程中没有材料损失

B、Itcausespermanentfailure导致永久失效

C、Itallowssurfaceasperitiestoadaptforsmootheroperation表面微凸体适配以实现更平稳运转

D、Iteliminatesfriction消除摩擦

答案:【Itallowssurfaceasperitiestoadaptforsmootheroperation表面微凸体适配以实现更平稳运转】30.单选题:Whichconditionisnecessaryforadhesiveweartooccur?

选项:

A、Cyclicloading循环载荷

B、Lubrication润滑

C、Directcontactbetweensurfaces表面直接接触

D、Chemicalenvironment化学环境

答案:【Directcontactbetweensurfaces表面直接接触】31.单选题:Abrasivewearoccurswhen:

选项:

A、Twosimilarhardnessmaterialscontact接触材料硬度相近

B、Softparticlesfloatbetweensurfaces软颗粒悬浮于表面之间

C、Onesurfaceismuchharderandscratchestheother一方表面显著更硬并划伤另一方

D、Lubricationbuildsup形成润滑

答案:【Onesurfaceismuchharderandscratchestheother一方表面显著更硬并划伤另一方】32.单选题:Whichweartypecanoccurevenwithfulllubrication?

选项:

A、Adhesivewear黏着磨损

B、Abrasivewear磨粒磨损

C、Fatiguewear疲劳磨损

D、Corrosivewear腐蚀磨损

答案:【Fatiguewear疲劳磨损】33.单选题:Whatisthemaincauseoffailureby“wearingout”?

选项:

A、Electricaloverload电流过载

B、Surfacedegradation表面退化

C、Softwarefailure软件故障

D、Internalcorrosion内部腐蚀

答案:【Surfacedegradation表面退化】34.单选题:Whichofthefollowingsurfacesislikelythesmoothest?

选项:

A、Hobbedsurface滚齿表面

B、Shavedsurface剃齿表面

C、Honedsurface珩磨表面

D、Polishedsurface抛光表面

答案:【Honedsurface珩磨表面】35.单选题:Rareferstowhichsurfaceproperty?

选项:

A、Hardness硬度

B、Meansurfacecurvature平均曲率

C、Arithmeticaverageroughness平均算术粗糙度

D、Thermalexpansioncoefficient热膨胀系数

答案:【Arithmeticaverageroughness平均算术粗糙度】36.单选题:Incontactmechanics,onlyasmallpercentageofthenominalareaactuallycontactsdueto:

选项:

A、Thermalshrinkage热缩

B、Micro-asperities微凸起存在

C、Surfacecolorchange表面变色

D、Magneticrepulsion磁斥

答案:【Micro-asperities微凸起存在】37.单选题:Whatisthedefinitionoffailureinmechanicalcomponents?

选项:

A、Completefractureonly仅限完全断裂

B、Temporarymalfunction临时故障

C、Anyconditionwherefunctioniscompromised任何功能受损的情况

D、Surfacediscoloration表面变色

答案:【Anyconditionwherefunctioniscompromised任何功能受损的情况】38.单选题:WhichofthefollowingisNOTacommontypeoffailure?

选项:

A、Breakage断裂

B、Wearingout磨损

C、Lubrication润滑

D、Obsolescence过时

答案:【Lubrication润滑】39.单选题:Failurebybreakageisusually:

选项:

A、Gradualandrepairable渐进的,可修复的

B、Suddenandpermanent突然发生且不可逆

C、Causedbyobsolescence由淘汰引起

D、Reversible可逆的

答案:【Suddenandpermanent突然发生且不可逆】40.单选题:WhichofthefollowingisNOTamaintypeoffriction?

选项:

A、Slidingfriction滑动摩擦

B、Rollingfriction滚动摩擦

C、Torsionalfriction扭转摩擦

D、Staticfriction静摩擦

答案:【Torsionalfriction扭转摩擦】41.单选题:LeonardodaVinci'searlyobservationonfrictionincluded:

选项:

A、Frictiondependsonvelocity摩擦力依赖速度

B、Smoothsurfaceshavelowfriction光滑表面摩擦小

C、Frictionincreaseswithtemperature摩擦随温度升高

D、Frictionisproportionaltoarea摩擦与接触面积成正比

答案:【Smoothsurfaceshavelowfriction光滑表面摩擦小】42.单选题:Amontons'lawstatesthat:

选项:

A、Frictiondependsonvelocity摩擦随速度变化

B、Frictionisproportionaltonormalforce摩擦与法向力成正比

C、Frictionincreaseswithtemperature摩擦随温度增加

D、Frictiondependsoncontactarea摩擦依赖接触面积

答案:【Frictionisproportionaltonormalforce摩擦与法向力成正比】43.单选题:Accordingtoclassicaltheory,whichofthefollowingistrue?

选项:

A、Staticfrictionislessthankineticfriction静摩擦小于动摩擦

B、Kineticfrictionincreaseswithvelocity动摩擦随速度增加

C、Staticfrictionisslightlygreaterthankineticfriction静摩擦略大于动摩擦

D、Frictiononlyexistswhenmotionoccurs只有运动时才有摩擦

答案:【Staticfrictionisslightlygreaterthankineticfriction静摩擦略大于动摩擦】44.单选题:Whichofthefollowingiscorrectabouttherealcontactarea(Ar)?

选项:

A、Itequalsnominalarea等于名义面积

B、Ar=Force/3×compressiveyieldstrength

C、Ar=Force×Ra

D、Itiszerounderload在载荷下为零

答案:【Ar=Force/3×compressiveyieldstrength】45.单选题:Whatistheapproximaterealcontactratioofmetalsurfacesunderload?

选项:

A、100%

B、50%

C、10–30%

D、0.01%–1%

答案:【0.01%–1%】46.单选题:TheparameterRqisdefinedas:

选项:

A、SquareofRaRa的平方

B、Rootmeansquareroughness均方根表面粗糙度

C、Randomsurfacecurvature随机曲率

D、Thermaldiffusionconstant热扩散常数

答案:【Rootmeansquareroughness均方根表面粗糙度】47.单选题:Frictionisdefinedas:

选项:

A、Aforcethatacceleratesmotion使运动加速的力

B、Aforcethatresistsrelativemotionbetweensurfaces阻碍表面间相对运动的力

C、Agravitationalforce重力

D、Amagneticforce磁力

答案:【Aforcethatresistsrelativemotionbetweensurfaces阻碍表面间相对运动的力】48.单选题:WhichofthefollowingisNOTacommontypeoffailure?下列哪项不是常见失效类型?

选项:

A、Breakage断裂

B、Wearingout磨损

C、Lubrication润滑

D、Obsolescence过时

答案:【Lubrication润滑】49.单选题:Whatisthedefinitionoffailureinmechanicalcomponents?机械零件中的“失效”指的是:

选项:

A、Completefractureonly仅限完全断裂

B、Temporarymalfunction临时故障

C、Anyconditionwherefunctioniscompromised任何功能受损的情况

D、Surfacediscoloration表面变色

答案:【Anyconditionwherefunctioniscompromised任何功能受损的情况】3.螺纹连接ThreadconnectionsQuizforthreadconnections1.单选题:[3]Whyistherenothreadinthetopmemberofaboltconnection?为什么在螺栓连接中上部零件没有螺纹?

选项:

A、Forcostsaving/节约成本

B、Forsealing/用于密封

C、Toeaseassemblyandavoidmisalignment/便于装配并避免错位

D、Toreducestrength/降低强度

答案:【Toeaseassemblyandavoidmisalignment/便于装配并避免错位】2.单选题:[3]Whichboltconnectiontypeallowsone-sidemaintenance?哪种螺栓连接类型便于单侧维护?

选项:

A、Throughbolted/通孔螺栓连接

B、Studbolted/螺柱连接

C、Tapbolted/内螺纹螺栓

D、None/无

答案:【Studbolted/螺柱连接】3.单选题:[3]Inthreaddesignation'M12x1.75',whatdoes'1.75'standfor?在螺纹标注“M12x1.75”中,“1.75”代表什么?

选项:

A、Majordiameter/大径

B、Threaddepth/螺纹深度

C、Pitch/螺距

D、Lead/导程

答案:【Pitch/螺距】4.单选题:[3]Whatistheeffectofincreasingnumberofthreadstarts?增加螺纹头数会带来什么影响?

选项:

A、Decreaselead/减少导程

B、Noeffect/无影响

C、Increaselead/增加导程

D、Reducepitch/减小螺距

答案:【Increaselead/增加导程】5.单选题:[3]Whichthreadtypeismostcommoninfastening?在紧固中最常见的螺纹类型是?

选项:

A、ACME/梯形螺纹

B、Square/方形螺纹

C、SharpV/尖V型螺纹

D、Trapezoidal/梯形

答案:【SharpV/尖V型螺纹】6.单选题:[3]WhichofthefollowingisacoarsethreadinUnifiedThreadSeries?以下哪项是统一螺纹系列中的粗牙螺纹?

选项:

A、UNF

B、UN

C、UNR

D、UNC

答案:【UNC】7.单选题:[3]Whatistheleadforasingle-startthread?单线螺纹的导程是多少?

选项:

A、Sameaspitch/等于螺距

B、Doublethepitch/螺距的两倍

C、Halfthepitch/螺距的一半

D、Zero/零

答案:【Sameaspitch/等于螺距】8.单选题:[3]单剪连接中螺栓主要承受哪种载荷?Insingleshearconnections,boltsprimarilybear:

选项:

A、拉伸载荷/Tensileload

B、剪切载荷/Shearload

C、弯矩/Bending

D、扭矩/Torque

答案:【剪切载荷/Shearload】9.单选题:[3]下列哪一项最有利于提高接触面的摩擦力?Whichbestimprovesfrictiononthecontactsurface?

选项:

A、使用润滑油/Uselubrication

B、表面粗化/Rougheningthesurface

C、增加螺距/Increasepitch

D、降低螺纹角/Reducethreadangle

答案:【增加螺距/Increasepitch】10.单选题:[3]双螺母防松的原理是:Theprincipleofdoublenutanti-looseningis:

选项:

A、减少接触面积/Reducecontactarea

B、增加摩擦力/Increasefriction

C、增加拉伸长度/Increaseelongation

D、消除间隙/Eliminategap

答案:【增加摩擦力/Increasefriction】11.单选题:[3]计算最大应力时,最常考虑的应力集中部位是:Whichlocationismostpronetostressconcentrationinbolts?

选项:

A、螺栓中部/Middleofthebolt

B、螺母平面处/Nutface

C、螺纹根部/Threadroot

D、螺杆端部/Bolttip

答案:【螺纹根部/Threadroot】12.单选题:[3]预紧力Pi的典型取值在非永久连接中约为:WhatisthetypicalpreloadPiP_iPiforanonpermanentboltedconnection?

选项:

A、0.5At·Sp

B、0.75At·Sp

C、0.9At·Sp

D、1.0At·Sp

答案:【0.75At·Sp】13.单选题:[3]下列哪项最能减小螺栓疲劳失效的风险?Whichofthefollowingbestreducestheriskofboltfatiguefailure?

选项:

A、增加螺纹长度/Increasingthreadlength

B、提高预紧力/Increasingpreload

C、减小摩擦系数/Reducingfrictioncoefficient

D、减小连接刚度/Decreasingjointstiffness

答案:【提高预紧力/Increasingpreload】14.单选题:[3]下列哪种材料级别的螺栓具有最高的拉伸强度?Whichboltpropertyclasshasthehighestminimumtensilestrength?

选项:

A、5.8

B、8.8

C、9.8

D、4.6

答案:【9.8】15.单选题:[3]下列哪个不是防松方式?WhichofthefollowingisNOTananti-looseningmethod?

选项:

A、双螺母/Doublenut

B、弹簧垫圈/Springwasher

C、锁紧销/Cotterpin

D、润滑螺纹/Lubricatingthread

答案:【润滑螺纹/Lubricatingthread】16.单选题:[3]即使设计为自锁,为什么仍需考虑螺栓松动?Whyisboltlooseningstillaconcernevenwithself-lockingdesign?

选项:

A、Threadsareimperfect/螺纹不完美

B、Cyclicloadingcausesslipping/循环载荷导致滑移

C、Torqueisinsufficient/扭矩不足

D、Nutsareoversized/螺母过大

答案:【Cyclicloadingcausesslipping/循环载荷导致滑移】17.单选题:[3]以下哪项不是常见的防松方法?WhichofthefollowingisNOTacommonmethodtopreventboltloosening?

选项:

A、Splitlockwasher/弹簧垫圈

B、Threadadhesive/螺纹胶

C、Doublenut/双螺母

D、Increaseclearance/增大间隙

答案:【Increaseclearance/增大间隙】18.单选题:[3]在轴向载荷下的螺栓连接中,疲劳破坏通常从哪里开始?Wheredoesfatiguefailureusuallyinitiateinaboltedjointunderaxialload?

选项:

A、Boltshank/螺栓杆部

B、Threadroot/螺纹根部

C、Nutbearingsurface/螺母承压面

D、Underthewasher/垫圈下方

答案:【Threadroot/螺纹根部】19.单选题:[3]为什么常在螺栓头和螺母下方使用垫圈?Whyarewashersoftenusedunderboltheadsandnuts?

选项:

A、Increasetorque/增加扭矩

B、Reducenoise/降低噪音

C、Distributeloadandprotectsurface/分散载荷并保护表面

D、Preventrust/防锈

答案:【Distributeloadandprotectsurface/分散载荷并保护表面】20.单选题:[3]剪切连接中预紧力不足易导致:Inshearjoints,insufficientpreloadmayleadto:

选项:

A、拉断/Tensilefailure

B、松动/Loosening

C、蠕变/Creep

D、润滑失效/Lubricationfailure

答案:【松动/Loosening】21.单选题:[3]在波动轴向载荷下,螺栓失效的主要原因是什么?Whatisthemaincauseofboltfailureunderfluctuatingaxialload?

选项:

A、Threadstripping/螺纹滑丝

B、Fatiguefracture/疲劳断裂

C、Creep/蠕变

D、Thermalexpansion/热膨胀

答案:【Fatiguefracture/疲劳断裂】22.单选题:[3]下列哪项有助于防止动态载荷下的螺栓松动?Whichofthefollowinghelpspreventboltlooseningunderdynamicloading?

选项:

A、Usethickwashers/使用厚垫圈

B、Uselocknuts/使用防松螺母

C、Reducepreload/减小预紧力

D、Usesoftermaterial/使用较软材料

答案:【Uselocknuts/使用防松螺母】23.单选题:[3]对于单线螺纹,螺距与导程的关系是什么?Whatistherelationshipbetweenpitchandleadforasingle-startthread?

选项:

A、Pitch>Lead/螺距大于导程

B、Pitch=Lead/螺距等于导程

C、Pitch<Lead>

D、Norelation/无关系

答案:【Pitch=Lead/螺距等于导程】24.单选题:[3]如果螺母太厚会怎么样?Whathappensifanutismadeexcessivelythick?

选项:

A、Improvesjointstrength/增强连接强度

B、Reducespreloadaccuracy/降低预紧力精度

C、Causesbendingofbolt/导致螺栓弯曲

D、Noeffect/没有影响

答案:【Reducespreloadaccuracy/降低预紧力精度】25.单选题:[3]下列哪项是正确的螺栓标注方式?Whichofthefollowingisthecorrectwaytospecifyabolt?

选项:

A、Bolt-M12x1.75/螺栓-M12x1.75

B、Screw-10mm/螺钉-10mm

C、Bolt8.8-M10coarse/螺栓8.8-M10粗牙

D、Thread2mm-ISO/螺纹2mm-ISO

答案:【Bolt-M12x1.75/螺栓-M12x1.75】4.带传动BeltdriveQuizforbeltdrive1.单选题:[4]与齿轮传动相比,带传动的主要缺点是什么?Whatisamaindisadvantageofbeltdrivecomparedtogeardrive?

选项:

A、Requireslubrication/需要润滑

B、Moreexpensive/更贵

C、Slippagemayoccur/可能打滑

D、Notsuitableforlongdistance/不适合远距离传动

答案:【Slippagemayoccur/可能打滑】2.单选题:[4]当带速过高时会发生什么?Whathappenswhenbeltspeedistoohigh?

选项:

A、Reducedtension/张力减小

B、Centrifugalforceincreases/离心力增加

C、Contactangleincreases/包角增加

D、Beltstrengthimproves/带强度提高

答案:【Centrifugalforceincreases/离心力增加】3.单选题:[4]推荐的典型带速范围是多少?Whatisthetypicalrecommendedbeltspeedrange?

选项:

A、0.1–0.5m/s

B、1–10m/s

C、10–30m/s

D、50–100m/s

答案:【10–30m/s】4.单选题:[4]在带传动中,为什么包角不应太小?Whyshouldthecontactanglenotbetoosmallinbeltdrive?

选项:

A、Reducesfrictionalgrip/减小摩擦力

B、Increasesspeedratio/增加传动比

C、Causesbeltelongation/导致带伸长

D、Decreasesbeltmass/减少带质量

答案:【Reducesfrictionalgrip/减小摩擦力】5.单选题:[4]Whatisthemainfunctionofabeltinabeltdrivesystem?/带传动系统中皮带的主要作用是什么?

选项:

A、Lubrication/润滑

B、Powertransmission/动力传递

C、Cooling/冷却

D、Noisereduction/降噪

答案:【Powertransmission/动力传递】6.单选题:[4]Comparedtogeardrives,beltdrivesaregenerally:/与齿轮传动相比,带传动通常具有以下哪种特点?

选项:

A、Morecompact/更紧凑

B、Moreexpensive/更昂贵

C、Lessvibartion/振动更小

D、Requirelubrication/需要润滑

答案:【Lessvibartion/振动更小】7.单选题:[4]Thewrapangleinbeltdrivesaffects:/带传动中的包角影响以下哪项?

选项:

A、Noiselevel/噪声水平

B、Pulleycost/皮带轮成本

C、Powertransmission/动力传递能力

D、Materialhardness/材料硬度

答案:【Powertransmission/动力传递能力】8.单选题:[4]与齿轮传动相比,带传动的一个优点是什么?Whatisoneadvantageofabeltdriveoverageardrive?

选项:

A、Noneedforalignment/无需对中

B、Cantransmitoverlongdistance/可长距离传动

C、Higherefficiency/效率更高

D、Noslip/无滑动

答案:【Cantransmitoverlongdistance/可长距离传动】9.单选题:[4]以下哪项会影响传动带的疲劳寿命?Whichofthefollowingfactorsaffectthefatiguelifeofbelt?

选项:

A、Pulleymaterial/皮带轮材料

B、Initialtension/初张力

C、Speedratio/传动比

D、Ambienttemperature/环境温度

答案:【Initialtension/初张力】10.单选题:[4]V带传动中小皮带轮的影响是?WhatistheeffectofasmallpulleyinaV-beltdrive?

选项:

A、Increasescontactarea/增加接触面积

B、Causeshigherstress/导致应力增大

C、Reducestension/减小张力

D、Improvesgrip/提高摩擦力

答案:【Causeshigherstress/导致应力增大】11.单选题:[4]以下哪项会导致带打滑?Whichofthefollowingisacauseofbeltslip?

选项:

A、Lowinitialtension/初张力不足

B、Highcontactangle/包角大

C、Balancedload/负载均衡

D、Lowspeedratio/传动比小

答案:【Lowinitialtension/初张力不足】12.单选题:[4]带传动中滑动通常从哪里开始?Slipinbeltdriveusuallystartsfromwhere?

选项:

A、Largepulley/大皮带轮

B、Smallpulley/小皮带轮

C、Beltcenter/带中部

D、Idlerpulley/张紧轮

答案:【Smallpulley/小皮带轮】13.单选题:[4]以下哪种应力通常不出现在传动带中?WhatstressisNOTtypicallyfoundinbelt?

选项:

A、Tensilestress/拉应力

B、Bendingstress/弯曲应力

C、Torsionalstress/扭转应力

D、Centrifugalstress/离心应力

答案:【Torsionalstress/扭转应力】14.单选题:[4]导致带提前疲劳的原因是?Whatcausesprematurefatigueinbelts?

选项:

A、Lowambienttemperature/环境温度低

B、Smallpulleydiameter/皮带轮直径小

C、Lowpreload/预紧力小

D、Widebeltsection/带截面宽

答案:【Smallpulleydiameter/皮带轮直径小】15.单选题:[4]以下哪种设计变化可增加包角?Whichdesignchangeincreasesbeltwrapangle?

选项:

A、Useidlerpulley/使用张紧轮

B、Increasespeedratio/增大传动比

C、Usewiderbelt/使用更宽的带

D、Usefewerpulleys/减少皮带轮数

答案:【Useidlerpulley/使用张紧轮】16.单选题:[4]哪种类型的带最不容易打滑?Whichtypeofbeltisleastpronetoslip?

选项:

A、Flatbelt/平带

B、Roundbelt/圆带

C、V-belt/V带

D、Canvasbelt/帆布带

答案:【V-belt/V带】17.单选题:[4]以下哪项可以提高带的疲劳寿命?Whichofthefollowingimprovesbeltfatiguelife?

选项:

A、Smallerpulley/更小的皮带轮

B、Higheroperatingtemperature/更高的操作温度

C、Widerbeltsection/更宽的带截面

D、Increasedbendingangle/增大弯曲角度

答案:【Widerbeltsection/更宽的带截面】18.单选题:[4]如果初张力过高,会发生什么?Whathappensifinitialtensionistoohigh?

选项:

A、Reducedstress/应力降低

B、Increasedfatigue/疲劳加剧

C、Improvedpowertransfer/提高功率传递

D、Noimpact/无影响

答案:【Increasedfatigue/疲劳加剧】19.单选题:[4]为了获得最佳张紧效果,张紧轮应放置在哪里?Whereshouldtheidlerpulleybeplacedforbesttensioningeffect?

选项:

A、Nearsmallpulley/靠近小皮带轮

B、Centerofbeltspan/带跨中部

C、Nearlargepulley/靠近大皮带轮

D、Anywhere/任意位置

答案:【Nearsmallpulley/靠近小皮带轮】20.单选题:[4]以下哪项不会增加传动带传递的功率?WhichofthefollowingwillNOTincreasepowertransmittedbybelt?

选项:

A、Increasingbeltwidth/增大带宽

B、Increasingtension/增大张力

C、Reducingcontactangle/减小包角

D、Usingmultiplebelts/使用多条带

答案:【Reducingcontactangle/减小包角】21.单选题:[4]为什么要限制最小皮带轮直径?Whyisitnecessarytolimitminimumpulleydiameter?

选项:

A、Preventslipping/防止打滑

B、Reducecentrifugalforce/减小离心力

C、Avoidsharpbending/避免急剧弯曲

D、Increasetorque/提高扭矩

答案:【Avoidsharpbending/避免急剧弯曲】22.单选题:[4]WhichofthefollowingisNOTatypeofbeltusedinmechanicaltransmission?/以下哪项不是机械传动中使用的带类型?

选项:

A、Flatbelt/平带

B、Vbelt/V带

C、Chainbelt/链带

D、Timingbelt/同步带

答案:【Chainbelt/链带】23.单选题:[4]WhichfactorincreasesthepowertransmissioncapacityofaV-belt?/下列哪项可以提高V带的传动能力?

选项:

A、Decreasingbelttension/减小带张力

B、Increasingwrapangle/增大包角

C、Usinglargerpulleys/使用更大的皮带轮

D、Reducingfriction/减小摩擦

答案:【Increasingwrapangle/增大包角】24.单选题:[4]Whichcomponentinbeltdriveensuresinitialtension?/带传动中哪个部件用于保证初张力?

选项:

A、Idlerpulley/张紧轮

B、Driverpulley/主动轮

C、Drivenpulley/从动轮

D、Shaft/轴

答案:【Idlerpulley/张紧轮】25.单选题:[4]Inbeltdrivesystems,creepismainlycausedby:/在带传动系统中,蠕变主要由什么引起?

选项:

A、Beltslip/带打滑

B、Elasticdeformation/弹性变形

C、Beltlength/带长

D、Pulleysize/皮带轮尺寸

答案:【Elasticdeformation/弹性变形】26.单选题:[4]Whatisthemaindisadvantageofbeltdrives?/带传动的主要缺点是什么?

选项:

A、Theycantransmithighpower./它们可以传递高功率。

B、Theyoperatewithoutlubrication./它们无需润滑即可运行。

C、Theyexperienceslipandcreep./它们会发生打滑和蠕变。

D、Theyarenoisierthangears./它们比齿轮噪音大。

答案:【Theyexperienceslipandcreep./它们会发生打滑和蠕变。】27.单选题:[4]Whichbelttypeprovidesconstantangularvelocityratio?/哪种带传动类型提供恒定的角速度比?

选项:

A、Flatbelt/平带

B、Vbelt/V带

C、Timingbelt/同步带

D、PolyVbelt/多楔带

答案:【Timingbelt/同步带】28.单选题:[4]WhyareV-beltspreferredoverflatbeltsinmanyapplications?/为什么在许多应用中V带优于平带?

选项:

A、Lowerfriction/摩擦力较低

B、Reversiblemotion/可逆运动

C、HigherpowertransimissionduetoHigherfriction/由于楔紧效应,摩擦力更大,能够传递的功率更大

D、Simplerpulleystructure/滑轮结构更简单

答案:【HigherpowertransimissionduetoHigherfriction/由于楔紧效应,摩擦力更大,能够传递的功率更大】29.单选题:[4]Whatcausesthefatiguefailureinbelts?/是什么导致带传动的疲劳失效?

选项:

A、Elasticity/弹性

B、Cyclicstress/循环应力

C、Lowspeed/低速

D、Poorlubrication/润滑不良

答案:【Cyclicstress/循环应力】30.单选题:[4]张紧轮的一个功能是什么?Whatisonefunctionofanidlerpulley?

选项:

A、Changespeedratio/改变传动比

B、Reducepowerloss/减小功率损失

C、Increasecontactangle/增加包角

D、Increaseslip/增加打滑

答案:【Increasecontactangle/增加包角】31.单选题:[4]带的典型失效模式是什么?Whatisthetypicalfailuremodeofabelt?

选项:

A、Plasticdeformation/塑性变形

B、Fracture/断裂

C、Fatiguecracking/疲劳开裂

D、Delamination/分层

答案:【Fatiguecracking/疲劳开裂】5.齿轮GearQuizforgear1.单选题:[5]Whatisthemainfunctionofgeartransmission?/齿轮传动的主要功能是什么?

选项:

A、Tolubricatemachineparts/为机器部件润滑

B、Toconnectelectricalcircuits/连接电路

C、Totransmitmotionandpowerbetweenshafts/在轴之间传递运动和动力

D、Toreducefriction/减少摩擦

答案:【Totransmitmotionandpowerbetweenshafts/在轴之间传递运动和动力】2.单选题:[5]Whichgeartypehasnon-parallelandintersectingaxes?/哪种齿轮类型具有非平行相交轴?

选项:

A、Spurgear/正齿轮

B、Helicalgear/斜齿轮

C、Wormgear/蜗杆齿轮

D、Bevelgear/锥齿轮

答案:【Bevelgear/锥齿轮】3.单选题:[5]Whatistheequationforpitchcirclediameterofagear?/齿轮节圆直径的公式是什么?

选项:

A、d=m+N

B、d=m/N

C、d=N/m

D、d=m×N

答案:【d=m×N】4.单选题:[5]以下哪项导致蜗轮蜗杆传动过热?Whichconditionleadstowormgearoverheating?

选项:

A、Highslidingfriction/滑动摩擦大

B、Smallcontactratio/啮合比小

C、Lowoillevel/油位低

D、Highinputtorque/输入扭矩大

答案:【Highslidingfriction/滑动摩擦大】5.单选题:[5]以下哪项不能有效降低蜗轮蜗杆的温升?WhichisNOTavalidwaytoreducewormgeartemperaturerise?

选项:

A、Installcoolingfan/安装冷却风扇

B、Usewatercooling/水冷

C、Usemultiplethreadworm/多头蜗杆

D、Increaseslidingspeed/提高滑动速度

答案:【Increaseslidingspeed/提高滑动速度】6.单选题:[5]蜗轮蜗杆传动为何需进行热平衡设计?Whatisthemainreasonwormgearsrequireheatbalancedesign?

选项:

A、Largegearsize/齿轮尺寸大

B、Highslidingfriction/滑动摩擦大

C、Axialforces/轴向力大

D、Smallhelixangle/螺旋角小

答案:【Highslidingfriction/滑动摩擦大】7.单选题:[5]齿轮磨损主要发生在哪?Wheredoesgearwearmainlyoccur?

选项:

A、Pitchpoint/节点附近

B、Toothroot/齿根

C、Toothtip/齿顶

D、Bearinghole/轴承孔

答案:【Pitchpoint/节点附近】8.单选题:[5]齿面点蚀的典型原因是什么?Whatisatypicalcauseofpittingongearsurfaces?

选项:

A、Slidingfriction/滑动摩擦

B、Cyclicstressandhighcontactload/循环应力与高接触载荷

C、Axialforce/轴向力

D、Inaccuratemodule/模数不准

答案:【Cyclicstressandhighcontactload/循环应力与高接触载荷】9.单选题:[5]直齿轮点蚀的典型发生部位是?Whatisthetypicallocationforpittingonspurgears?

选项:

A、Toothroot/齿根

B、Pitchline/节线附近

C、Toothtip/齿顶

D、Centerhole/中心孔

答案:【Pitchline/节线附近】10.单选题:[5]为什么在减速器中小齿轮通常使用更好的材料?Whyisthepinionusuallymadeofbettermaterialthangearinspeedreducer?

选项:

A、Pinionrotatesfasterandwearsmore/小齿轮转速高磨损大

B、Geariseasiertoreplace/大齿轮易于更换

C、Pinionislarger/小齿轮尺寸更大

D、Gearbearslesstorque/大齿轮受力小

答案:【Pinionrotatesfasterandwearsmore/小齿轮转速高磨损大】11.单选题:[5]齿根弯曲强度不足时,下列哪项不推荐?Iftoothbendingstrengthisinsufficient,whatmeasureisNOTrecommended?

选项:

A、Usestrongermaterial/使用更强材料

B、Increasefacewidth/增大齿宽

C、Increaseteethnumber/增加齿数

D、Reducehelixangle/减小螺旋角

答案:【Reducehelixangle/减小螺旋角】12.单选题:[5]为什么使用多头蜗杆?Whydoweusemultiplethreadworms?

选项:

A、Reduceweight/减轻重量

B、Increasetransmissionratio/增大传动比

C、Reduceslidingandimproveefficiency/降低滑动提高效率

D、Improvecoolingeffect/增强冷却

答案:【Reduceslidingandimproveefficiency/降低滑动提高效率】13.单选题:[5]以下哪个组件有助于蜗轮蜗杆散热?Whichcomponenthelpsdissipateheatinwormgeardrives?

选项:

A、Oilseal/油封

B、Watercoil/水冷盘管

C、Elasticpad/弹性垫片

D、Spacerring/垫圈

答案:【Watercoil/水冷盘管】14.单选题:[5]为避免烧蚀,润滑的最佳状态是?Whatisthebestlubricantconditiontoavoidscuffing?

选项:

A、Lowviscosity/低粘度

B、Hightemperature/高温

C、Continuo

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