测试

1、单选题：
​Which of the following is the least sensitive developer?‏
选项：
A: Dry powder
B: Aqueous soluble
C: Aqueous suspendable
D: Non-aqueous wet
答案: 【 Dry powder】

2、单选题：
​Penetrants which have an emulsifier already in them referred to as?‌
选项：
A: Post emulsifiable
B: Solvent removable
C: Water washable
D: Lipophilic penetrant
答案: 【 Water washable】

3、单选题：
‏A good penetrant requires a surface tension which is?‎
选项：
A: High
B: Low
C: Fast
D: Slow
答案: 【 Low】

4、单选题：
‏Which penetrant method is considered to be the most sensitive?‍
选项：
A: Visible solvent removable
B: Fluorescent water washable
C: Visible post emulsifiable
D: Fluorescent post emulsifiable
答案: 【 Fluorescent post emulsifiable】

5、单选题：
‍Which of the following is a method of applying penetrant?‎
选项：
A: Spraying
B: Dipping
C: Brushing
D: All of the above are methods
答案: 【 All of the above are methods】

6、单选题：
‍The time which the penetrant is allowed to soak on the surface of a component is commonly referred to as the?‎
选项：
A: Development time
B: Emulsification time
C: Dwell time
D: Inspection time
答案: 【 Dwell time】

7、单选题：
What is the benefit of using visible dye penetrant over a fluorescent penetrant?‌‍‌
选项：
A: Easier to remove the excess background      
B: Greater sensitivity is obtained
C: No special lighting is required          
D: All the above are benefits
答案: 【 No special lighting is required          】

8、单选题：
‌Wettability of a liquid penetrant is controlled by which of the following factors?‌
选项：
A: Cosine of the contact angle  
B: Viscosity
C: Surface tension        
D: Both cosine of the contact angle and surface tension
答案: 【 Both cosine of the contact angle and surface tension】

9、单选题：
The contact angle for most commercial liquid penetrants has which of the values listed below?‌‏‌
选项：
A: Less than 5 degrees 
B: Less than 10 degrees
C: Only needs to be less than 89 degrees
D: Only needs to be less than 89 degrees
答案: 【 Less than 5 degrees 】

第三章测试

1、单选题：
Magnetic particle inspection is a means for detecting discontinuities at or near the surface in_______materials?‏‏
选项：
A: Metallic
B: Nonconductive
C: Ceramic
D: Ferromagnetic
答案: 【 Ferromagnetic】

2、单选题：
‌The magnetic flux lines which flow through a bar magnet form closed loops