2021吉大机械复试专业英语词汇及翻译考题答案

2021吉大机械复试专业英语词汇及翻译考题答案

一、单项选择题（每题2分，共20分）1.Theterm"kinematics"inmechanicalengineeringrefersto:A.ThestudyofforcesandtheireffectsB.ThestudyofmotionwithoutconsideringforcesC.ThestudyofmaterialpropertiesD.Thestudyofenergyconversion2.Thecorrecttranslationof"齿轮"inEnglishis:A.BearingB.GearC.ShaftD.Pulley3."Thermodynamics"isprimarilyconcernedwith:A.ThestudyofheatandenergytransferB.ThestudyoffluidflowC.ThestudyofmaterialdeformationD.Thestudyofelectricalcircuits4.Theterm"bearing"isusedtodescribe:A.AcomponentthatsupportsrotationalmotionB.AtypeofgearC.AdeviceformeasuringtemperatureD.Atoolforcuttingmetal5.Thecorrecttranslationof"液压系统"inEnglishis:A.PneumaticsystemB.HydraulicsystemC.ElectricalsystemD.Mechanicalsystem6."Fatiguefailure"inmaterialsrefersto:A.SuddenfractureduetoasingleoverloadB.GradualfailureunderrepeatedcyclicloadingC.Corrosion-inducedfailureD.Thermalexpansionfailure7.Theterm"tolerance"inengineeringdrawingsrefersto:A.ThemaximumallowabledeviationfromaspecifieddimensionB.ThehardnessofamaterialC.TheweightofacomponentD.Thecolorofasurface8.Thecorrecttranslationof"焊接"inEnglishis:A.MachiningB.WeldingC.CastingD.Forging9."FiniteElementAnalysis(FEA)"isusedfor:A.PredictingthebehaviorofstructuresunderloadB.MeasuringsurfaceroughnessC.CalculatingfluidflowratesD.Testingmaterialhardness10.Theterm"CNC"standsfor:A.ComputerNumericalControlB.CentralizedNetworkControlC.ContinuousNumericalCalculationD.ControlledNetworkCommunication二、填空题（每题2分，共20分）1.TheEnglishtermfor"轴承"is________.2.Thetranslationof"stressconcentration"inChineseis________.3."Friction"istheresistanceto________motionbetweentwosurfacesincontact.4.TheChinesetermfor"tensilestrength"is________.5."Lubrication"helpstoreduce________betweenmovingparts.6.TheEnglishtermfor"刚度"is________.7.TheChinesetermfor"corrosionresistance"is________.8."Ductility"referstoamaterial'sabilityto________withoutbreaking.9.TheEnglishtermfor"疲劳寿命"is________.10.TheChinesetermfor"torque"is________.三、判断题（每题2分，共20分）1."Kinetics"isthestudyofmotionwithoutconsideringforces.()2."Gear"and"bearing"refertothesamemechanicalcomponent.()3."Hydraulicsystems"usecompressedairtotransmitpower.()4."Tolerance"inengineeringreferstotheallowabledeviationindimensions.()5."Welding"isaprocessofjoiningmaterialsbymeltingthem.()6."Fatiguefailure"occursduetoasinglehighload.()7."CNCmachining"iscontrolledbyacomputerprogram.()8."Stiffness"istheabilityofamaterialtoresistdeformationunderload.()9."Corrosion"isachemicalreactionthatdeterioratesmaterials.()10."Torque"isameasureofrotationalforce.()四、简答题（每题5分，共20分）1.Brieflyexplainthedifferencebetween"kinematics"and"kinetics."2.Whatisthesignificanceof"tolerance"inmechanicalengineering?3.Describetheroleof"lubrication"inreducingfrictioninmechanicalsystems.4.Howdoes"fatiguefailure"differfrom"brittlefracture"?五、讨论题（每题5分，共20分）1.Discusstheadvantagesanddisadvantagesofusinghydraulicsystemsinmachinery.2.Explaintheimportanceof"finiteelementanalysis"inmodernmechanicaldesign.3.Comparethepropertiesofductileandbrittlematerialsinengineeringapplications.4.Analyzetheimpactof"corrosionresistance"onthelifespanofmechanicalcomponents.---答案与解析一、单项选择题1.B2.B3.A4.A5.B6.B7.A8.B9.A10.A二、填空题1.bearing2.应力集中3.relative4.抗拉强度5.friction6.stiffness7.耐腐蚀性8.deform9.fatiguelife10.扭矩三、判断题1.×2.×3.×4.√5.√6.×7.√8.√9.√10.√四、简答题1.Kinematicsstudiesmotionwithoutconsideringforces,whilekineticsexaminestheforcescausingmotion.Kinematicsfocusesondisplacement,velocity,andacceleration,whereaskineticsinvolvesanalyzingforces,torque,andenergy.2.Toleranceensurespartsfitandfunctioncorrectlybydefiningallowabledeviationsindimensions.Itbalancesmanufacturingfeasibilitywithperformancerequirements,preventingassemblyissuesandexcessivecosts.3.Lubricationformsathinfilmbetweensurfaces,reducingdirectcontactandfriction.Itminimizeswear,dissipatesheat,andprolongscomponentlifebypreventingmetal-to-metaladhesion.4.Fatiguefailureoccursunderrepeatedcyclicloading,leadingtogradualcrackpropagation,whilebrittlefracturehappenssuddenlyunderhighstresswithoutsignificantdeformation.Fatigueisprogressive;brittlefractureisinstantaneous.五、讨论题1.Hydraulicsystemsofferhighpowerdensityandprecisecontrolbutrequiremaintenancetopreventleaksandcontamination.Theyexcelinheavymachinerybutarelessefficientthanelectricsystemsinsomeapplications.2.Finiteelementanalysis(FEA)enablesvirtualtestingofdesigns,predictingstressdistributionanddeformation.Itreducesprototypingcosts,optimizesmaterialusage,andensuressafetyincomplexstructures.3.Ductilematerials(e.g.,steel)deformplasticallybeforefracturing,absorbingenergy,whilebrittlematerials(e.g.,castiron)failsuddenlywithlittledeformation.Ductilityisprefe