机电专业英语期末复习试题一．选择题1.If all points in a linkage move in parallel planes the system undergoes plan ar motion and the linkage may be described as a .A.planar motionB. planar linkageC. jointsD. slide2.Though frame material and design should handle damping,are sometimes built into frame sections to handle specific problems.A .beams B. holes C. dampers D. screw3.The maximum allowable deflection of a shaft determined by critical s peed, gear, or bearing requirements.A. oftenB. mustC. wasD. is usually4.We will have to to better and better solutions as we generate more in formation.A. repeat many timesB. iteratingC. iterateD. try ways5.If a product configuration is specified and then examined to determ ine whether the performance requirements are met.A. finallyB. tentativelyC. temporaryD. have been6.Manufacturing can be defined as the of raw materials into useful prod ucts through the use of the easiest and lest-expensive methods.A. transformationB. processingC. processD. transforming7.The planer and knee types of milling machine is because of its flexibi lity.ed most commonlyB. most popularC. the most commonly usedD. mo st powerful8.As a result, the system will vibrate at the frequency of the force re gardless of the initial conditions or natural frequency of the system.A. actionB. excitationC. outD. act9.Before two components are assembled together, the relationship between the d imensions of the mating surfaces .A.must be giving outB. should printed clearlyC. must be specified D . should be clearly noted10.The main practical advantage of lower pairs is their better ability to trap lubricant between their surfaces.A. envelopingB. matingC. outerD. outside11.The word itself usually refers to the deterioration of metals and cer amics, while similar phenomena in plastics generally called .A. recrystallization…. corrosionB. recrystallization…degradationC. degradation…corrosionD. corrosion… degradation12.Most frames cast iron, weld steel, composition, or concrete.A. are made fromB. are made up ofC. was produced byD. was consist of13.Rotating shafts particularly those that run at high speeds, must be designed to avoid operation at speeds.A . lowB .overload C. critical D. hollow14.Although cast iron is a fairly cheap material, each casting requires a。

A. patternB. modelC. moldD. patent15.The term is used to describe joints with surface contact, as with a pin surrounded by a hole.A. high pairB. low pairC. surface pairD. rotary pa ir1-5：BCDCB 6-10：ACBCA 11-15 DACAB二．阅读1.L assie was a big dog. She was very clever. She was always helping someone.Once some bad men took some money from an old man. They tied him up with a rope and left hi m on the floor. They kept Lassie in another room. Lassie tried to open the door of the room. But s he couldn’t. There was a large window in the room, but it was too high for Lassie to reach. She pu lled a chair over to window and stood on it. She pushed and pulled and pulled at the window and a t last got it open. With a great jump, she got out.Lassie came back into the house and found the room where the old man was left. She untied the ro pe round the old man’s arms and legs. Then she helped him out of the house and down the road to the nearest house.( )1. Lassie was .A. a babyB. a catC. a dogD. a girl( )2. Once some bad men tool some money from .A. a young manB. a young womanC. an old womanD. an old man( )3. Lassie the door of the room.A. didn’t openB. openedC. shutD. didn’t shut( )4 . untied the old man.A.A girlB. A catC. A womanD. Lassie( )5. caught the bad men.A. The dogB. LassieC. The policemenD. The girl2.M r. George works at the school lost and found. He works very carefully. Every day, when he get s a lost thing, he takes notes about it. There are pens, books, school uniforms, keys, walkmans and many other things in the lost and found. Most of them are the students’. If you lose your things, it’ s easy for you to go to the lost and found for help. But you must tell Mr. George what it is and its c olor and the day when you can’t find it. I think Mr. George is very helpful, and you will be happy when you find the lost there.( )6 .Who works at the school lost and found?A. Mr. BrownB. Mr. KingC. Mr. GeorgeD. Nobody( )7 .There are things in the lost and found.A. noB. fewC. a fewD. many( )8. Most things Mr. George takes care of are the .A. boys’B. girls’C. students’D.teachers’( )9 .If you lose your things, you’d better go to ask .A. BenB. Mr. GeorgeC. your teacherD. your parents( )10.If you lose your thin gs and go to the lost and found for help, you needn’t tell Mr.George .A. What it isB. how much it isC. its colorD. the day when you lost it.3.T he students were having their chemistry（化学）class. Miss Li was telling the children what water was like. After that，she asked her students，"What’s water？”No one spoke for a few minutes．Miss Li asked again，“Why don’t you answer my question？Didn’t I tell you what water is like？”Just then a boy put up his hand and said，“Miss Li，you told us that water has no colour and no smell．But where to find such kind of water？The water in the river behind my house is always black and it has a bad smell．”Most of the children agreed with him．“I’m sorry，children．”said the teacher，“Our water is getting dirtier and dirtier．That’s a problem．( )11.The students were having their class．A．English B．Chinese C．chemistry D．mathswas like．( )12．Miss Li was telling the children whatA．water B．air C．earth D．weather( )13．A boy said，”The water in the river behind my house is always ．”A．white B．black C．clean D．clear( )14．Most of the children the boy．A．agreed with B．wrote to C．heard from D．sent for( )15．The water in the river has colour and smell because it is getting．A．more and moreB．less and lessC．cleaner and cleaner D．dirtier and dirtier1-5: CDADC 6-10: CDCBB 11-15: CABAD4.W orking drawings are the complete set of standardized drawings specifying the manufacture and assembly of a product based on its design. The complexity of the design determines the number and types of drawings. Working drawings may be on more than one sheet and may contain written instructions called specifications.Working drawings are blueprints used for manufacturing products. Therefore, the set of dra wings must:(a) completely describe the parts, both visually and dimensionally;(b)show the parts in assembly;(3)identify all the parts; and (4)specify standard parts. The graphics and text informatio n must be sufficiently complete and accurate to manufacture and assemble the product without err or.Generally, a complete set of Working drawings for an assembly includes:(1)Detail drawings of each nonstandard parts.(2)An assembly or subassembly drawing showing all the standard and nonstandard parts in a single drawing.(3)A bill of materials (BOM).(4)A title block.A detail drawing is a dimensioned, multiview drawing of a single part, describing the part’s shape, size, material, and surface roughness, in sufficient detail for the part to be manufactured based onthe drawing alone. Detail drawings are produced from design sketches or extracted from 3-D computer models. They adhere strictly to ANSI standards and the standard for the specific comp any, for dimensioning, assigning part numbers, notes, tolerances, etc.In an assembly, standard parts such as threaded fasteners and bearings are not drawn as details, but are shown in the assembly view. Standard parts are not drawn as details because they are normally purchased, not manufactured, for assembly.For large assemblies or assembled with large parts, details are drawn on multiple sheets, and a sep arate sheet is used for the assembly view. If the assembly is simple or the parts are small, detail dr awings for each part of an assembly can be placed on a single sheet.Multiple details on a sheet are usually drawn at the same scale. If different scales are used, they ar e clearly marked under each detail. Also, when more than one detail is placed on a sheet, the spaci ng between details is carefully planned, including leaving sufficient room for dimensions and note s.1.Based on the message, which of the follow is wrong ?A)standard parts needn’t drawn as detailsB)for simple parts, sometimes needn’t to draw the detail working drawingC)for large assemblies details may drawn on multiple sheetsD)If different scales used in a single sheet, they should clearly marked under each detail2.Working drawings for an assembly MAY NOT includes: ?A) BOM B) title blockC)An assembly or subassembly drawingD)Detail drawings of all parts.3.For detail drawing, Which one of the following statement is not true ?A)should not has different scalesB)Detail drawing can produced from design sketches or extracted from 3-D computer models.C)detail drawing is a dimensioned, multiview drawing of a single partD)should Adhere strictly to ANSI standards4.From the message we can infer ANSI is ?A) a set of law B) a set of notificationC) an Organization D) IEEE government5.The topic of the message is ?A)How to design working drawings.B)working drawing’s character a nd the key influence of how to draw a working drawingC)In the design process, what should be considered?D)What is working drawingBC ACD5.One principle aim of kinematics is to create (design) the desired motions of the subjects’ mechan ical parts and then mathematically compute the positions, velocities, and accelerations, which thos e will create on the parts. Since, for most earthbound mechanical systems, the mass remains essent ially constant with time, defining the accelerations as a function of time then also defines the dyna mic forces as a function of time. Stresses, in turn, will be a function of both applied and inertial (m a) forces. Since engineering design is charged with creating systems which will not fail during their expected service life, the goal is to keep stresses within acceptable limits for the materials chosen and the environmental conditions encountered. This obviously requires that all system forces be d efined and kept within desired limits. In machinery, the largest forces encountered are often those due to the dynamics of the machine itself. These dynamic forces are proportional to acceleration, which brings us back to kinematics, the foundation of mechanical design. Very basic and early dec ision in the design process involving kinematic principles can be crucial to the success of any mec hanical design; a design which has poor kinematics will prove troublesome and perform badly. Any mechanical system can be classified according to the number of degree of freedom (DOF) wh ich it processes. The system’s DOF is equal to the number of independent parameters which are ne eded to uniquely define its position in space at any instant of time.A rigid body free to move within a reference frame will, in the general case, has complex motion, which is a simultaneous combination of rotation and translation. In three-dimensional space, there may be rotation about any axis and also simultaneous translation which c an be resolved into components along three axes. In a plane, or two-dimensional space, complex motion becomes a combination of simultaneous rotation about one ax is (perpendicular to the plane) and also translation resolved into components along two axes in the plane1、Kinematics research focus on the following EXCEPT ..A) accelerations B) force C) positions, D) velocities2、From the passage that for the design engineer the first and most important isA) the service life of a machine B) the materials choose C) the degree of freedom D) kine matic principles3、An mechanical system has uniquely defined position in space at any instant of time that .A) It should has one DOF B) It should Has two DOFC) the DOF and the number of independent parameters should equal D) It should has any DOF as want4 、which one of the following is NOT TRUE ?.A)A rigid body free to move in three-dimensional space may rotation about any axisB)A rigid body free to move in three-dimensional space is a simultaneous combination of rotation and translationC)A rigid body free to move in three-dimensional space can be resolved into components along three axesD)A rigid body free to move in three-dimensional space may has complex motion5、The best title for this passage would be .A) kinematics B) dynamicsC) kinematics and dynamic D) the important of kinematicsBDCA C三．翻译(加书上的)1.A gear can be gripped axially between a shoulder on the shaft and a spacer, withtorque being transmitted through a key.一个齿轮可以用轴肩和挡圈进行轴向固定，并通过键来传递.2.One or more members such as gears, sprockets, pulleys, and cams are usually attached to the sha ft by means of pins, keys, splines, snap rings, and other devices.一个或多个诸如齿轮，链轮，皮带轮和凸轮等类的构件通常借助于销、键、花键、卡环或其它装置连接到轴上。