2021 Theory of Machine and Mechanisms(Xidian University) 最新满分章节测试答案

本答案对应课程为:点我自动跳转查看
本课程起止时间为:2021-03-10到2021-07-26
本篇答案更新状态:已完结

Chapter 1 Introduction Chapter 1 Unit Test

1、 问题:The term “synthesis” differs from “design” which is the process of prescribing the size, shape, material compositions, arrangements of parts, calculations of strength, methods of production, etc. 
选项：
A:正确
B:错误
答案: 【正确】

2、 问题:Mechanisms used in machines which have different functions and profiles may be the same.
选项：
A:正确
B:错误
答案: 【正确】

3、 问题:The radii of the holes and the cross-section areas of the links are the kinematics dimensions.
选项：
A:正确
B:错误
答案: 【错误】

4、 问题:Machine is a mechanical system that can transmit or transform energy, materials or information.
选项：
A:正确
B:错误
答案: 【正确】

5、 问题: Almost all machines contain only one basic mechanism.
选项：
A:正确
B:错误
答案: 【错误】

Chapter 2 Structural Analysis of Planar Mechanisms Chapter 2 Unit Test

1、 问题:In the following choices, which one is a planar higher pair?
选项：
A:
B:
C:
D:
答案: 【】

2、 问题:In the following single-cylinder four-stroke internal combustion engine, which part is an output link?
选项：
A:2
B:3
C:4
D:5
答案: 【4】

3、 问题:In the following mechanisms, which one has not redundant DOF.
选项：
A:
B:
C:
D:
答案: 【】

4、 问题:In the following mechanism, the DOF of the mechanism is      .
选项：
A:0
B:1
C:2
D:3
答案: 【2】

5、 问题:In the following mechanisms, whose DOF differ from others.
选项：
A:
B:
C:
D:
答案: 【】

6、 问题:If the compound pair contains K links, the number of revolute joints is      .
选项：
A:K-2 
B:K-1
C:K
D:K+1
答案: 【K-1】

7、 问题:In the following mechanism, it has      redundant constraints.
选项：
A:0
B:1
C:2
D:3
答案: 【2】

8、 问题:In the following mechanism, in order to have a determined motion, the mechanism needs to have      driving link(s).
选项：
A:1
B:2
C:3
D:4
答案: 【1】

9、 问题:In the following choices, which one cannot be deleted before the calculation of the DOF of a mechanism?
选项：
A:compound pairs
B:passive DOF
C:redundant constraints
D:all of the above
答案: 【compound pairs】

10、 问题:In the following mechanism, the mechanism has      redundant constraint(s) and      DOF.
选项：
A:2，3
B:2，1
C:0，3
D:0，1
答案: 【0，3】

Chapter 3 Kinematic Analysis of Planar Mechanisms Chapter 3 Unit Test

1、 问题:How many instant centers in the mechanism below?
选项：
A:5
B:6
C:7
D:8
答案: 【6】

2、 问题:How many instant centers in the mechanism below?
选项：
A:3
B:4
C:5
D:6
答案: 【3】

3、 问题:The cam mechanism below has the dimensions: R=50mm, lOA=20mm,lAC=80mm, j1=90 degree. Cam 1 rotates at a constant angular velocity of w1 = 10 rad/s. counterclockwise. P12 is an instant center. The angular velocity w2 of follower 2  is equal to:
选项：
A:
B:
C:
D:
答案: 【】

4、 问题:The velocity vector polygon and acceleration vector polygon of the link are similar to the shape of the link.
选项：
A:正确
B:错误
答案: 【正确】

5、 问题:The method of instant center can be applied to calculate velocity and acceleration. 
选项：
A:正确
B:错误
答案: 【错误】

6、 问题:Kinematic analysis only involves the analysis of velocity and acceleration.
选项：
A:正确
B:错误
答案: 【错误】

7、 问题:For a high pair, the contact point is the instant center.
选项：
A:正确
B:错误
答案: 【错误】

8、 问题:For a planar mechanism, the number of instant centers can be calculated by the equation , where k is the number of links in the mechanism.
选项：
A:正确
B:错误
答案: 【正确】

9、 问题:Instant centers can be classified into _ and _.
答案: 【absolute instant centers, relative instant centers】

10、 问题:The instant center of a revolute pair in a planar mechanism is ___.
答案: 【rotation center】

11、 问题:Relative motion graphic method is based on two theories,___ and ___.
答案: 【relative motion of two different points on the same link, relative motion of two coincident points on the different link.】

12、 问题:For relative motion graphic method, the velocity vector starting from the polar point is _, while the velocity vector connecting two kinematic pairs is _____.
答案: 【absolute velocity, relative velocity.】

13、 问题:As for the sliding pair in a planar mechanism, the location of instant center is located at __.
答案: 【infinite area and perpendicular to the sliding direction】