# 2021中国大学MOOC Engineering Mechanics(Xidian University) 最新中国大学MOOC满分章节测试答案

## 01. Principles of Statics and the Free-Body Diagrams Test of Chapter 1

1、 问题:The constraint at Point C is A:Pin support
B:Roller support
C:Built-in support
D:Lever

2、 问题:“axiom of two forces in equilibrium” can be applied to deformable body.

A:正确
B:错误

3、 问题:The constraint at point B is a Pin support. A:正确
B:错误

4、 问题:Which bar is a “two-force body” ? AB and BC;
Bar AB and Bar BC;
Bar AB, Bar BC;
Bars BC and AB;
BC and AB;
Bar BC and Bar AB;
Bar BC, Bar AB;
AB, BC;
AB BC;
BC AB;
BC, AB

## 02. Basic Operations with Force Systems Test of Chapter 2

1、 问题:Consider the coplanar force system shown in the following figure, F1=200N, F2=300N, F3=100N, and F4=250N. The magnitude of the resultant of the four forces is A:171.3 N
B:71.3 N
C:100 N
D:173.2 N

2、 问题:  A: B: C: D: 3、 问题:  A: B: C: D: 4、 问题:  79;
78.9

## 03. Reductions and Resultants of Force System Test of Chapter 3

1、 问题:The Principal Moment is related to moment center point O

A:正确
B:错误

2、 问题:A force at a given point can always be replaced by a force at a different point and a couple-vector that is parallel to the force.

A:正确
B:错误

3、 问题:The resultant force and the principal vector are the same

A:正确
B:错误

## 04. Equilibrium of Coplanar Force System Tset of Chapter 4

1、 问题:  A: B: C: D: 2、 问题:  A: B: C: D: 3、 问题:  ## 05. Axial tension and compression Test of Chapter 5

1、 问题: Low carbon steel will occur in the yield stage ( )

A: Elasticity
B: Linear elasticity
C:Plasticity
D: Elasticity and plasticity

2、 问题:The plane assumption in axial tension and compression is applicable to ( ).

A: Everywhere along the length of the rod
B:Everywhere except the two ends of the rod
C:Everywhere a bit far from the afterburner end of the rod
D: Everywhere along the width of the rod

3、 问题: The relationship between internal force and stress is ( ).

A: Internal force is greater than stress
B:Internal force is equal to the algebraic sum of stress
C: Internal force is vector and stress is scalar
D: Stress is the concentration of distributed internal force

4、 问题:the factors that affect the ultimate stress are ( ).

B: Material properties
C: Section size
D: Working conditions

Working conditions

5、 问题: The factors that affect the working stress of members are ()

B: Material properties
C: Section size
D: Working conditions

Section size

6、 问题: the external force causing the axial tension and compression deformation of the rod must be a pair of concentrated forces along the axis of the rod ( ).

A:正确
B:错误

7、 问题:Only statically indeterminate structures can have assembly stress and temperature stress( ).

A:正确
B:错误

8、 问题: In axial tension, the ratio of axial stress to strain is always constant( ).

A:正确
B:错误

9、 问题:After the rod is extended, the transverse direction will be shortened, because there is transverse stress in the rod( ).

A:正确
B:错误

10、 问题: Internal force refers to the internal force of an object after external force( ).

A:正确
B:错误

11、 问题:the greater the axial force is, the easier the bar is to be broken, so the axial force can be used to judge the strength of the bar( ).