机原习题集(双语0)
2019年机械工程专业英语教程课后题翻译_1-4单元.doc
Unit 1Two methods of designating limit dimensions are considered as standard .One method is the maximum material method in which the large dimensions is placed above the smaller dimension for male parts, and the reverse is true for female parts. This method is well suited for small lot quantities because it is likely that the machinist himself may check the dimensions of the parts. In so doing, he will be verifying initially the larger dimension of the male part and the smaller dimension of the female part. The other method is the maximum number method and is preferred by production and quality control departments. In this method of designating a dimension, the larger number is always placed above the smaller number, regardless of whether the part is male or female.这两种极限尺寸方法指定为标准。
一个方法是最大的材料的方法，大尺寸放在上面的较小尺寸的凸圆零件，而相反的是真正的凹槽部分或内孔零件。
发动机原理(双语)考试样题答案
五、Calculation.(20scores)
The cylinder number of a gasoline engine i=6, number of strokeτ=4，diameter of cylinder D=100[mm], length of stroke S=110[mm], rotation speed n=3000[r/min]，brake torque Ttq=477.5 [N·m]，the mass of fuel induced per hour B=37 [kg/h]，low calorific value of the fuel hu=44100 [kJ/kg], mechanical efficiencyηm=0.83.(Pe＝(pme·Vs·i·n)/30τ)，Vs－swept volume).Calculate:
4. fuel-air ratio:Fuel-air ratio(FAR) is the mass ratio of fuel toair present in an internal combustion engine.
5.engine load characteristics:Relation between the instantaneous value of main engine economic parameters and engine load,when engine speed is maintained constant.
Answer: Mechanical power is composed of these sections: pumping power, compressor power, auxiliary power, friction power, and turbine power (if a turbine used). All the “losses” can be evaluated by mechanical loss power Pmas well as pmm—mechanical mean effective pressure (mmep), the part of the indicated mean effective pressure used to overcome mechanical friction. .
西方经济学习题集(双语版)
5 questions and answers
1-5 Why is entrepreneurial ability considered a category of economic resources, distinct from labor? What are the major functions of the entrepreneur? Entrepreneurial ability and labor are both human resources, but they perform different functions in the productive process. Entrepreneurial ability does not directly produce goods and services; it organizes the resources that do. Labor refers to the human inputs that directly engage in production. Entrepreneurs are risk-takers: They coordinate the activities of the other three inputs for profit—or loss, which is why they are called risk-takers. Entrepreneurs sometimes manage companies that they own, but a manager who is not an owner is not necessarily an entrepreneur but may be performing some of the entrepreneurial functions for the company. Entrepreneurs are also innovators, or perhaps inventors, and profits help to motivate such activities.
机务工程英语试题和答案资料
请写出下列单词的含义ACCESSORY GEARBOX 附件齿轮箱ACCUMULATOR 储压器ACTUATOR 作动筒/器BEARING(两个含义) 1方位;2轴承BORESCOPE 孔探BRACKET 支架BYPASS V ALVE 旁通活门CHIP DETECTOR 金属碎屑探测器FAIRING 整流罩FASTENER 紧固件FLAME ARRESTOR 火焰抑制器GASKET 密封垫LUBRICANT 润滑(剂)MANIFOLD 总管MUFFLER 消音器NOZZLE 喷嘴QUADRANT 扇形轮RECEPTACLE 插座SNUBBER 缓冲器SOLENOID 电磁线圈SQUIB 爆管/爆炸帽SUMP 集油槽SURGE 喘振SHOCK STRUT 减震支柱STICK SHAKER 抖杆器SPRING LOADED 弹簧加载THERMOCOUPLE 热电偶TRANSPONDER 应答机TURNBUCKLE 松紧螺套一写出下列缩写的全称及中文意思1CCO component change order 部件更换指令2BS(6章) body station 机身站位3GCU generator control unit 发电机控制组件4IDG integrated drive generator 整体驱动发电机5BTB bus tie breaker 汇流条连接断路器6TRU transformer rectifier unit 变压整流组件7PRSOV pressure regulate shut-off valve 压力调节关断活门8ACM(21章) air cycle machine 空气循环机9CPC cabin pressure controller 客舱压力控制器10EMDP electric motor drive pump 电马达驱动泵11AACU anti-skid auto-brake control unit 防滞自动刹车控制组件12PSEU proximity switch electronic unit 临近电门电子组件13WHCU window heat control unit 风挡加温控制组件14DEU display electronic unit 显示电子组件15DFDR digital flight data recorder 数字飞行数据记录器二英译汉16Brake Seizure刹车抱死17The airplane has three main jack points and four auxiliary jack points.飞机有三个主顶点和四个辅助顶点18NOTE: Make sure you set and release the parking brake with the same hydraulic system pressurized. If you release the parking brake with a different system pressurized, you will transfer hydraulic fluid from one system to the other.注意: 确保使用同一个增压的液压系统设置和释放停留刹车.如果使用不同的增压系统释放停留刹车,会使液压油从一个系统转移到另一个系统19CAUTION: WHEN YOU CLOSE THE BATTERY SWITCH, THE BATTERY AND STANDBY BUSES HAVE POWER.YOU WILL DISCHARGE THE BATTERY TO ZERO VOLTS VERY FAST. YOU SHOULD GET AN AC POWER SOURCE ON THE ELECTRICAL SYSTEM QUICKLY.告诫:当你闭合电瓶电门,电瓶汇流条和备用汇流条有电.这样你将很快就把电瓶电压释放到零伏,你应当尽快给电源系统提供交流电.20Do not supply more than 60 psi of pressure to the pneumatic system. If you supply too much pressure, damage to equipment and injuries to personnel can occur.不要给气源系统提供超过60psi的压力.如果你提供过高的压力,会发生设备损伤和人员伤亡.21OUTFLOW VALVE IS MOTOR OPERATED. DO NOT INSERT HAND OR TOOLS IN OUTLET DURING ANY GROUND OPERATION OR INJURY TO PERSONS CAN OCCUR.外溢流活门是马达操作的.在任何地面操作期间都不要把手和工具伸进去,否则会发生人身伤亡22Because the EDP depressurization solenoid valve gets electrical power when the EDP HYD PUMP switch is OFF, you normally keep the switch in the ON position.因为EDP 释压电磁活门是在EDP液压泵电门在OFF位的时候通电,所以正常情况下电门保持在ON位.23WARNING: YOU MUST CAREFULLY INSTALL THE GROUND LOCKS IN ALL LANDING GEAR. AN ACCIDENTAL RETRACTION OF THE LANDING GEAR CAN CAUSE INJURY TO PERSON AND DAMAGE TO EQUIPMENT警告:你必须仔细地给所有起落架插上地面安全销.意外地收上起落架会导致人员伤亡和设备受损三汉译英24航后检查发现右外主轮磨损见线，参照AMM32-45-11,更换此轮。
八年级英语科技发明原理深奥解析练习题40题(带答案)
八年级英语科技发明原理深奥解析练习题40题(带答案)1. The invention of papermaking has a long history. In the process of making paper, which of the following is the most important raw material?A. MetalB. Wood pulpC. StoneD. Plastic答案解析：B。
造纸术最重要的原材料是木浆。
选项A金属，金属不是造纸的主要原材料，造纸过程中不会以金属为基础原料。
选项C石头，石头与造纸原料毫无关系。
选项D塑料，现代虽然有一些特殊纸张可能会添加塑料成分，但传统造纸术的主要原料是木浆，木浆wood pulp这个表达也是本题的关键英语词汇。
2. Printing was a great invention. It helps to spread knowledge widely. When printing, what is used to transfer the ink onto the paper?A. A penB. A block or plateC. A brushD. A finger答案解析：B。
在印刷术里，是用印版或者印模（block or plate）来把油墨转移到纸上的。
选项A钢笔，钢笔是书写工具，不是印刷工具。
选项C刷子，虽然刷子可以蘸墨，但不是印刷术中用来转移油墨到纸上的常规工具。
选项D手指，手指显然不能用于印刷术中油墨的转移。
3. The ancient Chinese invented the compass. What is the main function of the compass?A. To measure timeB. To find directionsC. To weigh thingsD. To make fire答案解析：B。
机械专业双语考试题库
机械专业双语考试题库一、选择题（每题2分，共30分）1. 在机械设计中，哪一个因素是影响零件强度和刚度的主要因素？A. 材料选择B. 零件尺寸C. 加工精度D. 表面处理2. 机械加工中，切削速度的单位是什么？A. 米/秒（m/s）B. 转/分钟（rpm）C. 米/小时（km/h）D. 转/秒（r/s）3. 以下哪个是机械工程中常用的材料性能指标？A. 弹性模量B. 热膨胀系数C. 摩擦系数D. 所有选项都是4. 什么是机械传动中的基本传动方式？A. 齿轮传动B. 链条传动C. 皮带传动D. 所有选项都是5. 机械制图中，第一角投影法和第三角投影法的主要区别是什么？A. 视图的放置顺序B. 视图的数量C. 视图的方向D. 视图的标注方式6. 轴承的类型中，滚动轴承和滑动轴承的主要区别是什么？A. 摩擦系数B. 承载能力C. 制造成本D. 维护要求7. 什么是机械系统中的静平衡？A. 系统在运动过程中保持平衡B. 系统在静止状态下保持平衡C. 系统在受到外力作用下保持平衡D. 系统在任何状态下都保持平衡8. 机械设计中，如何确定零件的尺寸精度？A. 根据零件的功能要求B. 根据零件的材料特性C. 根据零件的加工工艺D. 所有选项都是9. 什么是机械制造中的热处理？A. 提高材料的硬度B. 改善材料的韧性C. 改变材料的微观结构D. 所有选项都是10. 在机械系统中，振动的原因可能是什么？A. 不平衡的旋转部件B. 轴承的磨损C. 齿轮的啮合误差D. 所有选项都是二、填空题（每空1分，共20分）11. 机械工程中的“三视图”包括______、______和______。
12. 机械加工中，工件的表面粗糙度用______表示，其单位是______。
13. 机械设计中，为了减少摩擦，通常采用______和______两种方法。
14. 机械系统中，传动效率是指______与______的比值。
15. 在机械制图中，尺寸线应与被标注的表面______，且尺寸线之间应保持______。
机械专业外语_习题集(含答案)
《机械专业外语》课程习题集一、短文翻译(英译汉)1. The solution to most design problems does arise from a set of equations, instead it is a compromise to satisfy a number of design requirements and practical limitations such as available tooling and servicing ease. Designs are often revised to introduce new features, but as much as possible of the old design is retained for economic reasons. Producing a revised design is usually not as difficult as producing a new design because the history of the original is available for evaluation.2. When cutting screw threads, power is provided to the gearbox of the apron by the lead screw. In all other turning operations, it is feed rod that drives the carriage. The lead screw goes through a pair of half nuts, which are fixed to the rear of the apron. When actuating a certain lever, the half nuts are clamped together and engage with the rotating lead screw as a single nut, which is feed , together with the carriage along the bed.3.Generally, grinding is considered to be a finishing process that is usually used for obtaining high-dimensional accuracy and better surface finish. Grinding can be performed on flat, cylindrical, or even internal surfaces by employing specialized machine tools, which are referred to as grinding machines. Obviously, grinding machines differ in construction as well as capabilities, and the type to be employed is determined mainly by the geometrical shape and nature of the surface to be ground. -e.g. cylindrical surfaces are ground on cylindrical grinding machines.4. The dielectric serves to concentrate the discharge energy into a channel of very small crosssectional area. It also cools the two electrodes, and flushes away the products of machining from the gap. The electrical resistance of the dielectric influences the discharge spark energy and time of spark initiation .if the resistance is low , an early discharge spark occurs. If it is large the capacitor will attain a higher value charge before the discharge spark occurs.5. As we previously saw, CNC,DNC and computer-assisted part programming are different kinds of preplanned computerized control of machine tools. In all cases, the tool path has to be established beforehand through a program, the person who prepares the programs employs his or her experience in order to bring the processing time to minimum and not to cause any damage or distortion to the workpiece. This is, in many cases, a difficult problem that involves many factors, alternatives, and constraints. Obviously, this is exactly where an expert system is needed.6. Equipment productively is improved because of the better utilization of machines whenCIM is implemented. We can see that factors like program ability of equipment and computerized monitoring and control of the whole manufacturing facility would largely improve the efficiency of machine utilization. Higher labor and equipment productivity would certainly result in lower product cost.7. Where loads are due to contact, a pair of equal and opposite forces occur. One force acts as an external load on one contacting member. This action-reaction force pairing is one of the basic natural laws put to practical use by engineers. Tracing these power transmission forces through connected machine linkages is an extremely useful visualization aid for identifying machine component loads.8. Element design is concerned with the proper sizing of machine elements to perform a given function at some stated life criterion. Mechanical designers must also be familiar with properties of materials and machining processes to achieve optimal design. In addition, designers must always contend with the question of cost. The watchword should be simplicity, since a simple device is usually the least expensive.9. The tailstock assembly consists basically of three parts, its lower base, an intermediate part, and the quill. The lower base is a casting that can slide on the lathe bed along the guideways, and it has a clamping device to enable locking the entire tailstock at any desired location, depending upon the length of the workpiece. The intermediate part is a casting that can be moved transversely to enable alignment of the axis of the tailstock with that of the headstock.10. Internal grinding is employed for grinding relatively short holed. The workpiece is held in a chuck or a special fixture. Both the grinding wheel and the workpiece rotate during the operation and feed is applied in the longitudinal direction. Any desired depth of cut can be obtained by the cross feed of the grinding wheel. A variation from this type is planetary internal grinding, which is recommended for heavy workpieces that cannot be held in chucks. In the case, the grinding wheel not only spins around its own axis but also rotates around the centerline of the hole that is being ground.11. The intelligent robot has always been the dream of manufacturing engineers, in order to make the automated factory of the future attainable. It is artificial intelligence that will make that dream come true. By definition, an intelligent robot is one that is able to think, sense, and effect, so that it can cope with a changing environment and learn from experience. Since thinking is a brain function, it is obvious that it would fall within the domain of artificial intelligence if it is to be performed by a computer. An integration between sensing, reasoning, and effecting would unify artificial intelligence and robots, with the final outcome an intelligent robot.12. In recent years, there has been a dramatic increase in the range of media used to convey information. Initially, communication was limited to simple forms of media such as voice and paper. This century, however, has witnessed the introduction of a greater variety of media types such as the telephone and visual forms of media. In the latter part of the century,this trend has accelerated and there is now a wide range of media types available to convey information.13. It is well known that a hot plate of metal will cool faster when placed in front of a fan than when exposed to still air. We say that the heat is convected away and we call the process convection heat transfer. Convection is a much simpler physical process than conduction since it merely consists of the actual motion of a volume of hot fluid from one place to another.14.Around the turn of the twentieth century the steam turbine came into use. Steam turbines are very efficient. They can utilize almost 40 percent of the energy supplied to them. They are three times as efficient as reciprocating engines. Steam turbines power many of the world's ships and the majority of the world's electricity generating stations.15. Most small i.C.engines in common use has four cylinders, which fire in a definite and regular sequence. A flywheel is fitted to the crankshaft to keep it running smoothly. It is essential for the inlet and exhaust valves to open and close at exactly the appropriate moment in relation to the position of the piston. Therefore they are actuated by a cam-shaft running in phase with the crankshaft.16. The alternative to forming method is machining. In machining, a sharpened tool of suitable shape removes material in the form of chips until the desired shape is produced. The use of computer and punched-tape control of machine tools makes it possible forthe machining tool to follow any complex three-dimensional path.17. Perhaps because more high-strength, hard, tough, and exotic materials are used, there isa tendency to use chipless machining despite the progress just noted. There is a trend to reduce the amount of metal that needs to be removed. Often chipless machining is more expensive, but the reduced loss of material results in a saving. The increased use of metal forming, forging, rolling, die-casting and other processes illustrates this trend.18.For the semi-mechanized forging of small to medium-sized components, forging hammers powered by various means are employed. The feature common to all of them is that, like the hand forging hammer, they utilize the energy of a falling weight to develop the pressure needed for shaping the metal. Larger components are forged by means of forging presses operated by steam or compressed air or by hydraulic or electric power. Largely automatic forging machines are used for the quantity production of engineering parts.19. As we know, these are the main tasks of an engineer: to explore new ways, invent new solutions to problems, and design new devices. In the research stage of a project, the engineer usually has found a new way of doing a job and is analyzing it (using mathematics and computers) to see how feasible the idea is and how well it will work. The development stage then follows. Here the idea is carried out in the laboratory. The processes vary among different projects, but the basic point is the same: Turn the idea into a working reality.20.The fact that steel can possess a wide range of useful mechanical properties is of extreme economic importance. This is clearly illustrated in the railroad industry, forex-ample. To move a train from one place to another, we use a locomotive which has the ability to pull a given total load. This load is composed of the weight of the cars and the weight of the freight being transported. If a freight car is made of high strength steel, the structural members can be relatively small and the car will be lighter as well as stronger. This means that the amount of freight can be increased.21.The simplest method of welding two pieces of metal together is known as pressure welding. The ends of metal are heated to a white heat— for iron, the welding temperature should be about 13000C—in a flame, At this temperature the metal becomes plastic. The ends are then pressed or hammered together, and the joint is smoothed off. Care must be taken to ensure that the surfaces are thoroughly clean first, for dirt will weaken the weld. Moreover, the heating of iron or steel to a high temperature causes oxidation, and a film of oxide is formed on the heated surfaces.22. The design of a machine includes many factors other than those of determining the loads and stresses and selecting the proper materials. Before construction or manufacture can begin, it is necessary to have complete assembly and detail drawings to convey all necessary information to the shop men. The designer frequently is called upon to check the drawings before they are sent to the shop. Much experience and familiarity with manufacturing processes are needed before one can become conversant with all phases of production drawings.23. Flat pulleys and belts. This is the oldest and simplest type of pulley and belt. The pulley may be a single pulley, or it may have three or four different diameters. A one-piece pulley having three or four diameters is called a cone pulley. Actually the pulleys are not flat. They are tapered slightly so that the diameter of the pulley is a little larger at its center. We call this a crowned pulley. The pulley is made larger in diameter at the center because a flat belt will always climb to the highest part of a pulley. The crown ensures that the belt will run in the center of the pulley.24.Of course, materials have always been vital to human civilization. Three of humanity’s earliest eras are called the Stone Age, the Bronze Age, and the Iron Age, because the civilization of each was almost entirely dependent on the material after which the era was named. But now, in the twentieth century, materials-not just one, but many-have become a most important factor on which the advance of technology and industry depends. Our progress in space, in electronics, and in atomic energy is directly linked to the solution of crucial materials problems.25.The purpose of the design calculations is of course to attempt to predict the stress or deformation if the part in order that it may safely carry the loads which will be imposed upon it, and that it may last for the expected life of the machine. All calculations are, of course, dependent on the physical properties of the construction materials as determined by laboratory tests. A rational method of design attempts to take the results of relatively simple and fundamental tests and apply them to all the complicated and involved situations encountered in present-day machinery.二、按要求翻译下列句子（略）……答案1.对大多数设计问题的解决并不是来源于一组公式，而是受制于要满足很多设计要求和实际限制诸如可用的工具或使用的舒适性。
机工英语考试题库及答案
机工英语考试题库及答案一、单选题（每题2分，共40分）1. The machine is designed to operate at a speed of ________.A. 1000 rpmB. 1500 rpmC. 2000 rpmD. 2500 rpm答案：B2. The ________ of the engine is crucial for its performance.A. efficiencyB. capacityC. powerD. torque答案：A3. The ________ system is responsible for cooling the engine.A. lubricationB. exhaustC. coolingD. fuel答案：C4. The ________ is used to measure the temperature of the machine.A. thermometerB. ammeterC. voltmeterD. tachometer答案：A5. The ________ is a key component in the transmission system.A. clutchB. brakeC. gearD. belt答案：C6. The ________ is used to control the speed of the machine.A. governorB. regulatorC. controllerD. actuator答案：A7. The ________ is responsible for converting mechanical energy into electrical energy.A. generatorB. motorC. alternatorD. transformer答案：A8. The ________ is used to reduce the speed of the machine.A. pulleyB. leverC. gearD. belt答案：C9. The ________ is used to measure the pressure of the machine.A. manometerB. barometerC. voltmeterD. ammeter答案：A10. The ________ is a type of bearing that allows for rotation.A. ball bearingB. roller bearingC. plain bearingD. thrust bearing答案：A11. The ________ is used to control the flow of fuel into the engine.A. carburetorB. injectorC. pumpD. filter答案：B12. The ________ is a type of valve that controls the flow of fluids.A. gate valveB. check valveC. globe valveD. butterfly valve答案：A13. The ________ is used to measure the electrical current in a circuit.A. voltmeterB. ammeterC. ohmmeterD. wattmeter答案：B14. The ________ is a type of joint that allows for limited movement.A. riveted jointB. welded jointC. bolted jointD. pinned joint答案：C15. The ________ is used to measure the electrical resistance in a circuit.A. voltmeterB. ammeterC. ohmmeterD. wattmeter答案：C16. The ________ is a type of bearing that operates on a sliding surface.A. ball bearingB. roller bearingC. plain bearingD. thrust bearing答案：C17. The ________ is used to measure the electrical power in a circuit.A. voltmeterB. ammeterC. ohmmeterD. wattmeter答案：D18. The ________ is a type of bearing that supports a rotating shaft.A. ball bearingB. roller bearingC. plain bearingD. thrust bearing答案：A19. The ________ is used to control the temperature of the machine.A. thermostatB. regulatorC. controllerD. actuator答案：A20. The ________ is a type of valve that prevents backflow of fluids.A. gate valveB. check valveC. globe valveD. butterfly valve答案：B二、填空题（每题2分，共20分）21. The ________ is a type of bearing that supports a rotating shaft and reduces friction.答案：ball bearing22. The ________ is used to convert the linear motion of a piston into the rotational motion of a crankshaft.答案：crankshaft23. The ________ is a type of valve that controls the flow of fluids by rotating a disc.答案：butterfly valve24. The ________ is used to measure the electrical voltage in a circuit.答案：voltmeter25. The ________ is a type of bearing that operates on a rolling element.答案：roller bearing26. The ________ is used to convert the rotational motion of a crankshaft into linear motion.答案：piston27. The ________ is a type of valve that controls the flow of fluids by sliding a gate.答案：gate valve28. The ________ is used to measure the electrical current in a circuit.答案：ammeter29. The ________ is a type of bearing that operates on a sliding surface and reduces friction.答案：plain bearing30. The ________ is used to measure the electrical resistance in a circuit.答案：ohmmeter三、判断题（每题2分，共20分）31. The governor is used to control the speed of the machine. (对/错)答案：对32. The clutch is a key component in the transmission system. (对/错)答案：对33. The pulley is used to increase the speed of the machine. (对/错)答案：错34. The ammeter is used to measure the electrical current in a circuit. (对/错)答案：对35. The generator is responsible for converting electrical energy into mechanical energy. (对/错)36. The carburetor is used to control the flow of fuel into the engine. (对/错)答案：对37. The thrust bearing is used to support a rotating shaft. (对/错)答案：错38. The voltmeter is used to measure the electrical voltage in a circuit. (对/错)答案：对39. The gate valve is a type of valve that controls the flow of fluids by rotating a disc. (对/错)答案：错40. The ohmmeter is used to measure the electrical resistance in a circuit. (对/错)四、简答题（每题10分，共20分）41. Explain the function of a thermostat in a machine.答案：A thermostat is a temperature control device that regulates the temperature of a machine by controlling the flow of coolant. It maintains the engine at an optimal operating temperature by opening or closing the cooling system's flow path as needed.42. Describe the purpose of a regulator in an electrical circuit.答案：A regulator in an electrical circuit is a device that maintains a constant voltage level by adjusting the output voltage to compensate for changes in load or input voltage. It ensures that the voltage supplied to the circuit remains stable and within the desired range, preventing damage to sensitive electronic components.。
航海英语903机编考试卷50期完整答案无阅读
航海英语903机编考试卷50期完整答案无阅读第一篇：航海英语903机编考试卷 50期完整答案无阅读50期 903英语机考题目汇编1,[2286]Some of these shoals have been disproved and are not charted．Nevertheless mariners should ______ with particular caution in this area． A.go B.proceed C.move D.remove KEY: B 2,[136]Information on the operating times and characteristics of foreign radiobeacons can be found in which publication? A.List of Lights B.Coast Pilot C.Sailing Directions D.List of Radiobeacons KEY: A 3[247]A red triangular daymark marks ______.A.the centerline of a navigable channel B.the starboard side of a channel C.a prominent object of navigational interest that has no lateral significance D.an area of a channel where passing another vessel is permitted KEY: B 4[293]What information is found in the chart title? A.Date of the first edition B.Date of the edition and，if applicable，the revision rmation on the sounding datum rmation on which IALA buoyage system applies KEY: C 5[284]The maximum difference between mean time and apparent time is ______.A.equal to the longitude expressed in time units B.about 16 minutes C.the difference between the GHA of mean sun and the first point of Aries D.15°of arc KEY: B 6[279]The chart of a beach area shows a very flat slope to the underwater beach bottom.What type of breakers can be expected when trying to land a boat on this beach? A.Surging B.Spilling C.Plunging D.Converging KEY: B 7,the broken magenta lines starting at Mountank point and running generally ENE to Block Island indicate ___A_____ A recommended tracks to Block Island B a submerged cable area C a military exercise area D demarcation [ˌdi:mɑ:ˌkeɪʃən] 分界线lines for application of the COLREGS 8navigate with _D___ small fishing boats are within 0.8miles of me A carefulil B skill C concern D caution 9[469]Mariners are FIRST warned of serious defects or important changes to aids to navigation by means of ______.A.marine broadcast Notice to Mariners B.Weekly Notices to Mariners C.corrected editions of charts D.Light Lists KEY: A 10[353]All events relating to the voyage，such as ship's position，speed and details of the weather，are recorded in ______.同原题库2246 A.Logbook B.Bell Book C.Oil Record Book pass Error Book KEY: A所有与航次有关的事件，诸如船位，航速和气象的详细资料都被记录在航海日记中。
《机械工程专业英语》测试题含答案
封面作者：Pan Hongliang仅供个人学习《机械工程专业英语》测验题(18-22)一、将下列词组译成汉语1.the base circle（基圆）2.the pitch curve（啮合曲线）3.the contact force（接触力）4.the intermittent motion（间歇运动）5.the common normal（公法线）6.the conjugate profiles（共轭齿廓）7.the cycloidal profiles （摆线齿形）8.the involute profiles（渐开线齿形）9.the spur gear（直齿轮）10.the herringbone gears（双螺旋齿轮）11.the face gear（端面齿轮）12.the radial distance（径向距离）13.the addendum circle（齿顶圆）14.The tooth thickness（齿厚）15.the tooth space（齿间隙）16.the cap screws（螺钉）17.the setscrews（固定螺丝钉）18.the engineering graphics（工程力学）19.mechanical design（机械设计）20.the installation techniques（安装技术）21.the bolted joint（螺栓连接）22.the hardened washers（强化垫圈）23.the fatigue resistance（抗疲劳强度）24.the modulus of elasticity（弹性模量）25.the antifriction bearing（减摩轴承）26.the rolling bearing（滚动轴承）27.the rolling contact （滚动接触）28.the sliding contact（滑动触电）29.the corrosion resistance（抗腐蚀性）30.the machining tolerances（加工公差）31.the fatigue loading（疲劳载荷）32.the radial loads（径向负荷）33.the thrust loads逆负荷34.the ball bearing球轴承35.the roller bearing滚子轴承36.the single-row bearings单沟轴承37.the double-row bearing双沟轴承38.the needle bearing滚针轴承39.the bearing life轴承寿命40.The rating life额定寿命41.the axis of rotation旋转轴42.The helix angle螺旋角43.a right-hand helix 右旋44.a left-hand helix左旋45.an involute helicoids螺旋面46.an involute curve渐开线47.the shaft centerlines轴中心线48.worm gear蜗轮49.the hypoid gear准双曲面齿轮50.right angle直角51.worm gearing蜗杆传动52.the lead angle导角53.shaft angle轴线角度54.bending load弯曲载荷55.tension load张力负荷pression load压缩负载57.torsional load扭转负荷58.the bending moment弯矩59.the bending stress弯曲应力60.the shot peening喷丸法61.the actuating force工作力62.the coefficient of friction摩擦系数63.An electromagnetic coil电磁线圈64.the magnetic circuit磁路二、将下列短语译成汉语1.disk or plate translating (two-dimensional or planar)盘形传动凸轮（两维的，即平面的）2.cylindrical (three-dimensional or spatial) cams圆柱形凸轮（三维的，即空间的）机构3. a radial (in-line) translating roller follower一个对心直动滚子从动件4. a constant angular velocity ratio旋转角速度的比例5. a constant torque ratio一个恒转矩比6.Nonlinear angular velocity ratios非线性角速度比率7.the parallel helical gear平行斜齿轮8.the crossed helical gear交叉斜齿轮9.the straight bevel gear直锥齿轮10.the spiral bevel gear弧齿锥齿轮11.the skew bevel gear大角度斜交锥齿轮12.the hexagon head screws六角头螺钉13.the fillister head screws槽头螺钉14.the flat head screws 平头螺钉15.the hexagon socket head screws内六角沉头螺钉。
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
2-1Please draw the kinematic diagrams of the mechanisms shown below。
(a)(b)(c)2-2 Please calculate the DOF of mechanisms as follows, can you point out these mechanisms have a determined motion or not ? (The link with arrow is driving link)（d ）（c ）3-1 Please confirm the location of the instant centres of mechanisms as follows（Using the signP）。
ij4-1According to the link dimension ,determine the type of four-bar linkage holding different link as frame？4-2 In a revolute four-bar linkage ABCD shown as below b=100mm c=80mm d=110mm(1)Find the range of the values for the length L AB of link AB if the linkage is either (a) crank-rocker mechanism with crank AB ,or(b) a double-rocker mechanism.(2) Can the linkage be a double-crank mechanism by choosing L AB suitably?Why?4-3 In the double-crank linkage ABCD shown as below L AB=80mm L BC=180mm L CD=230mm L AD=200 The driver BC rotates at a constant speed. Find the minimum transmission angleof the linkagemin4-4 In the revolute four-bar linkage ABCD Let link AD is the frame L AB=60mm L BC=130mm L CD=140mm L AD=200mm and 0BAD∠=135(1)Determine the type of the revolute four-barmechanism(2) If the side link AB is a driver and rotates at aconstant speed(a)find the pressure angle αand transmission angle γof the mechanism at that position(b) Find the angularϕstroke of the link CDmax(c) Find the crank acute angleθbetween the twolimiting positions(d) Calculate the time ratio K(e) Will any dead-point occur during the whole cycle ofthe motion?(f) Find the maximum pressure angleαand themax minimum transmission angleγmin4-5 Design the revolute four-bar linkage ABCD according to the figure as below:Let the length of rocker L CD =75mm , L AD=100mm and Link AD is the frame , the time ratio K=1.5 , The angle between one limiting position of rocker and the frame 045∠=CDACalculate the length of L AB、L BC（has two results）4-6 Design the offset slider-crank mechanism ABC according to the figure as below: The crank AB is the driver, Let the length of crank L AB =25mm, The offset e=10mm, The maximum pressure angle 0max 30α= Find the stroke H of the slider and the crank acute angleθ between the two limiting positions.4-7 图所示为一牛头刨床的主传动机构，已知mm l AB 75=，mm l D E 100= ，行程速比系数K=2，刨头5的行程H=300mm ，要求在整个行程中，推动刨头5有较小的压力角，试设计此机构。
5-1 For the plate cam with translating offset knife-edge follower Let the lift mm h 4.2=，cam angle for rise00120δ=，cam angle for outer dwell 0s 60δ=，camangle for return 00120δ'=，cam angle for inner dwell 0s 60δ'=.The follower rise as constant acceleration anddeceleration motion curve ；and return as cosine acceleration motion curve.Please draw the displacement curve of the follower.5-2For the plate cam with translating offset knife-edge follower shown as belowPlease draw the displacement curve of the follower by graphical method5-3 图示为一偏置滚子从动件盘形凸轮机构。
已知凸轮轮廓由三段圆弧和一直线组成，它们的圆心分别O 、O /及O //，半径分别为mm r mm r mm r 536,18=''='=及，偏距e=8mm 。
滚子半径mm r T 5=。
现要求：1）、画出凸轮的理论轮廓曲线及基圆；2）、求出从动件的行程h 、推程运动角a δ及回程运动角c δ； 3）、标出图示位置从动件的位移s 及凸轮机构的压力角α； 4）、标出凸轮由图示位置转过600时，从动件的位移S /及凸轮机构的压力角α'。
6-1 For the figure shown as below ，Let the radius of base circle mm r b 30= The radius of curvature of the involute at the point K mm K K mm r k 15,35==，Find ：1) The radius of curvature of the involute at the point K /k r 'and the pressure angle k α'。
2) if k r k r '''=。
Calculate the length of arc K K '''.6-2 An involute standard spur gear has parameters Z=26, m=3mm, h*a=1,0α=. Find the radii of curvature of20tooth profile on the reference circle and the tip circle and the pressure angle on the tip circle6-3 A pair of standard spur involute gears has a moduleof 5mm, pressure angle 020α=,center distancea=350mm, transmission ratio 129/5i =.Calculate the numbers of teeth Z 1,Z 2,reference diameters d 1,d 2,addendumdiametersd a1,d a2,basediametersd b1,d b2,tooth thickness s and spacewidth e.6-4 For a pair of external standard spur gears pressure angle 020α=, module m=20mm, Z 1=30, Z 2=40.(1)Calculate the working pressure angle α' when the working center distance is a /=725mm.(2)If the working pressure angle 02230α''=,find the center distance is a /.6-5 For a pair of external standard spur gears020αα'==, m=5mm, Z 1=19, Z 2=42.Calculate the contact ratioαε6-6 已知一对外啮合变位齿轮传动，1221==Z Z ，m=10mm ，020＝α，mm a h a 130,1*='=，试设计这对齿轮传动(列表给出两轮的),,,,,,,s d d d d h h y b f a f a ，并验算重合度及齿顶圆齿厚（S a 应大于0.25m ，取21x x =）。