Mechanical Engineering Practice 金工实习 知到智慧树答案2024 z25497

绪论 单元测试

1、
In this course, which part does the knowledge of “injection molding” belong to?

A:Industrial Design;
B:Manufacturing; 
C:3D digital measurement;
D:CNC Turning
答案: Manufacturing; 

第一章 单元测试

1、
The parting plane is the contact surface between the stationary and moving sides of the mold. 

A:对
B:错
答案: 对

2、
During the plastication stage, the polymer melt is forced from the barrel of the molding machine and into the mold. 

A:对
B:错
答案: 错

3、
After the mold cavity is filled with the polymer melt, the packing stage provides additional material into the mold cavity as the molten plastic melt cools and contracts. 

A:对
B:错
答案: 对

4、
An injection mold has many structures to accomplish the functions required by the injection molding process. 

A:对
B:错
答案: 对

5、
An injection mold is constructed of a number of plates, bolted together with socket head cap screws. 

A:对
B:错
答案: 对

第二章 单元测试

1、
Whether a part is qualified depends first on whether it has reached the basic size. Just equal to the basic size must be qualified products.（ ）

A:对
B:错
答案: 错

2、
Dimensional deviation is the difference of a certain size minus its basic size, so the size deviation can be positive, negative and zero. （ ）

A:对
B:错
答案: 对

3、
Position tolerance can be divided into three categories: directional tolerance, positioning tolerance and runout tolerance.（）

A:对
B:错
答案: 对

4、
The surface roughness of parts is directly related to the processing method.（）

A:对
B:错
答案: 对

5、
 Surface roughness belongs to micro geometric error. （）

A:对
B:错
答案: 对

6、
The surface roughness symbol represents the machined surface obtained by material removal. （）

A:对
B:错
答案: 错

7、
When measuring workpiece with vernier caliper, the measurement error will increase if the force is too large or too small. （）

A:对
B:错
答案: 对

8、
The outer diameter micrometer is a measuring tool for measuring aperture and groove depth. （）

A:对
B:错
答案: 错

9、
The vernier universal angle ruler can measure any angle from 0 to 360 degrees. （）

A:对
B:错
答案: 错

10、
Relative measurement method is used when measuring length with percentile meter. （）

A:对
B:错
答案: 对

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