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Chapter 2 Composition of mechanisms Chapter 2 exam
1、 What is the right expression to determine the degree of freedom for a mechanism?
A:F＝3n－2PL－PH
B:F＝3n－2PL
C:F＝3n－PL－PH
D:F＝3n－2PL－2PH
答案: F＝3n－2PL－PH
2、 Lower pairs are kinematic pairs with
A:No contact
B:Point contact
C:Line contact
D:Surface contact
答案: Surface contact
3、 Passive degree of freedom refers to
A: The degree of freedom locally exists in a specific link and does not influence the motion of other links
B:The degree of freedom existed in part of a link
C:The degree of freedom existed in several links in a mechanism
D:The degree of freedom existed in part of a mechanism
答案: The degree of freedom locally exists in a specific link and does not influence the motion of other links
4、 Redundant constraints refers to
A:Constraints that do not play any role for motion transmission to other links
B:Constraints in a mechanism that do not exist
C:Constraints that cannot be seen
D:Constraints that are practically useless
答案: Constraints that do not play any role for motion transmission to other links
5、 Which of the following terms are the proper descriptions of the characteristics for kinematic pairs?
A:Contact
B:Connection
C:Movable
D:Firm
答案: Contact;
Connection;
Movable
6、 What are the composition elements of mechanisms?
A:Links
B:Kinematic pairs
C:Parts
D:Components
答案: Links;
Kinematic pairs
7、 According to the types of contact, kinematic pairs can be classified into lower pairs and higher pairs. A higher pair refers to
A:Kinematic pair with point contact
B:Kinematic pair with line contact
C:Kinematic pair with surface contact
D:Kinematic pair with body contact
答案: Kinematic pair with point contact;
Kinematic pair with line contact
8、 The characteristics of Assur groups are
A:DOF=0
B:Basic link groups whose DOF=0 and cannot be further separated
C:Mechanical systems with lower pairs
D:Immobile mechanical systems with DOF=0
答案: DOF=0;
Basic link groups whose DOF=0 and cannot be further separated;
Mechanical systems with lower pairs
9、 This is a lower pair connection
A:正确
B:错误
答案: 正确
10、 This is a lower pair connection
A:正确
B:错误
答案: 正确
11、 This is a lower pair connection
A:正确
B:错误
答案: 错误
12、 This is a lower pair connection
A:正确
B:错误
答案: 错误
13、 This is a lower pair connection
A:正确
B:错误
答案: 正确
14、 This is a lower pair connection
A:正确
B:错误
答案: 正确
15、 For a mechanism, when its degree of freedom equals to the number of driving links, it has determined motion.
A:正确
B:错误
答案: 正确
16、 In the calculation of degree of freedom, we should not consider redundant constraints.
A:正确
B:错误
答案: 正确
chapter 1 Introduction Chapter 1 exam
1、 What are the main features of machines?
A:Assembly of man-made components
B:Determinate relative motions among different components
C:Can conduct work/energy conversion
D:Well designed shapes and structures
答案: Assembly of man-made components;
Determinate relative motions among different components;
Can conduct work/energy conversion
2、 What are the main features of mechanisms?
A:Assembly of man-made components
B:Determinate relative motions among different components
C:Can conduct work/energy conversion
D:Well designed shapes and structures
答案: Assembly of man-made components;
Determinate relative motions among different components
3、 The study objects of ‘Theory of Machines and Mechanisms’ are mechanisms and machines.
A:正确
B:错误
答案: 正确
Chapter 3 Kinematic Analysis of Mechanisms Chapter 3 exam
1、 The instantaneous center of velocity of two links that form a turning pair is located at
A:The center of the turning pair
B:On the circle of the turning pair
C:Any point on the circle of the turning pair
D:One of the two links
答案: The center of the turning pair
2、 The instantaneous center of velocity of two links that form a sliding pair is located at
A:Infinity point perpendicular to the direction of the guide line of the sliding pair
B:On the line perpendicular to the direction of the guide line of the sliding pair
C:In the middle of the guide line
D:At the contact point of the two links
答案: Infinity point perpendicular to the direction of the guide line of the sliding pair
3、 The instantaneous center of velocity of two links that form a higher pair is located__
A:On the common normal line of the contact point
B:On the common tangent line of the contact point
C:At the contact point of the two links
D:Infinity point along the common normal line of the contact point
答案: On the common normal line of the contact point
4、 Instantaneous center P13 is the point at which link () and link () share the same velocity, including the magnitude and direction
A:1,3
B:2,4
C:1,2
D:3,4
答案: 1,3
5、 Choose the correct sequence to conduct kinematic analysis by using the analytical method.a) Set up the coordinateb) Build up vector equationsc) Express the links with vectorsd) Solve equations to get solutions
A:a-b-c-d
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