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1、课程 机械工程专业英语 课程性质（必修限选任选） 考试方式（闭卷开卷）一、选择题（在每题四个备选答案中选出一个正确答案，本大题共15小题，每小题1分，总计15分）1. If all points in a linkage move in parallel planes the system undergoes planar motion and the linkage may be described as a .A. planar motion B. planar linkage C. joints D. slide 2. Though frame material and design s
2、hould 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 speed, gear, or bearing requirements. A. often B. must C. was D. is usually 4. We will have to _ to b
3、etter and better solutions as we generate more information. A. repeat many times B. iterating C. iterate D. try ways 5. If a product configuration is _ specified and then examined to determine whether the performance requirements are met.A. finally B. tentatively C. temporary D. have been6. Manufact
4、uring can be defined as the _ of raw materials into useful products through the use of the easiest and lest-expensive methods.A. transformation B. processing C. process D. transforming7. The planer and knee types of milling machine is _ because of its flexibility. A. used most commonly B. most popul
5、ar C. the most commonly used D. most powerful8. As a result, the system will vibrate at the frequency of the _ force regardless of the initial conditions or natural frequency of the system. A. action B. excitation C. out D. act9. Before two components are assembled together, the relationship between
6、 the dimensions of the mating surfaces_. A. must be giving out B. should printed clearlyC. must be specified D. should be clearly noted 10. The main practical advantage of lower pairs is their better ability to trap lubricant between their _ surfaces. A. enveloping B. mating C. outer D. outside11. T
7、he word_ itself usually refers to the deterioration of metals and ceramics, while similar phenomena in plastics generally called _. A. recrystallization. corrosion B. recrystallizationdegradation 题 号一二三四五六七八总 分得 分C. degradationcorrosion D. corrosion degradation12. Most frames _ cast iron, weld steel
8、, composition, or concrete.A. are made from B. are made up of C. was produced by D. was consist of13. Rotating shafts particularly those that run at high speeds, must be designed to avoid operation at speeds.A . low B .overload C. critical D. hollow14. Although cast iron is a fairly cheap material,
9、each casting requires a .A. pattern B. model C. mold D. patent15. The term is used to describe joints with surface contact, as with a pin surrounded by a hole.A. high pair B. low pair C. surface pair D. rotary pair 二、完型填空（在每个小题四个备选答案中选出一个正确答案，本大题共15小题，每小题1分，总计15分）The term shaft usually refers to a r
10、elatively long member of round cross section that rotates and transmits power. One or more members such as gears, sprockets, pulleys, and cams are usually (16) to the shaft by means of pins, keys, splines, snap rings, and other devices. These latter members are among the “associated parts” considere
11、d in this text, as are couplings and universal joint, which serve to (17) the shaft to the source of power or load.A shaft can have a noround cross section, ant it need not necessarily rotate. It can be stationary and serve to (18) a rotating member, such as the short shafts that support the nondriv
12、ing wheels of an automobile. The shafts supporting(19) gears can be either rotating or stationary depending on (20) the gear is attached to the shaft or supported by it through bearings.It is apparent that shafts can be subjected to various combinations of axial, bending, and(21) loads, and that the
13、se loads may be static or fluctuating. Typically, a rotating shaft transmitting power is (22) to a constant torque (producing a mean torsional stress) together with a completely reversed bending load (producing an alternating bending stress).In addition to satisfying (23) requirements, shafts must b
14、e designed so that deflections are within acceptable limits. Excessive (24) shafts deflection can hamper gear performance and cause (25) noise. The associated angular deflection can be very destructive to no-self- aligning bearings(either plain or rolling). (26) deflection can affect the accuracy of a cam or gear driven mechanism. Furthermore, the greater the flexibility -either lateral or torsional-the lower the corresponding (27) speed. 考生注意： 考试时间 120 分钟 试卷总分 100 分 共 5 页 第 1 页专 业班 级装订线学 号姓 名 Sometimes members l
