Non-Destructive Testing (NDT) Practice Test

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Which penetrant classification is divided into various sensitivity levels?

Type I
Type II
Type III
Type IV

The correct answer is: Type I

The classification of penetrants that is divided into various sensitivity levels is Type I. Type I penetrants are fluorescent, which means they require ultraviolet light for visibility. This type is known for its sensitivity to surface-breaking defects, making it highly effective in identifying very fine cracks or flaws. The different sensitivity levels within Type I allow for tailored inspections, enabling inspectors to choose the appropriate level of sensitivity based on the specific requirements of the application or the materials being tested. This capability to classify and select based on sensitivity is crucial for ensuring that defects are detected according to the standards necessary for safety and reliability in various industries. While there are other types of penetrants, such as Type II, Type III, and Type IV, they do not share the same feature of having multiple sensitivity levels. Type II is a visible dye penetrant, while Types III and IV are specified for other applications and do not incorporate the detailed sensitivity levels found within Type I.