机械专业英语试题及答案

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 should handle damping, are sometimes built into frame sections to handle specific problems.

A .beams B. holes C. dampers D. screw

3. 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 better 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 been

6. Manufacturing 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. transforming

7. The planer and knee types of milling machine is _____ because of its flexibility.

A. used most commonly

B. most popular

C. the most commonly used

D. most powerful

8. 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. act

9. Before two components are assembled together, the relationship between the dimensions of the mating surfaces_______.

A. must be giving out

B. should printed clearly

C. 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. outside

11. The word______ itself usually refers to the deterioration of metals and ceramics, while similar phenomena in plastics generally called ______.

A. recrystallization…. corrosion

B. recrystallization…degradation

C. degradation…corrosion

D. corrosion… degradation

12. Most frames _______ cast iron, weld steel, composition, or concrete.

A. are made from

B. are made up of

C. was produced by

D. was consist of

13. Rotating shafts particularly those that run at high speeds, must be designed to avoid operation

at speeds.

A . low

B .overload C. critical D. hollow

14. Although cast iron is a fairly cheap material, each casting requires a .

A. pattern

B. model

C. mold

D. patent

15. 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 relatively 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” considered 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 nondriving 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 these 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 be 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