Non-Destructive Testing (NDT) Practice Test

If you have a penetrant system that is Type 1, which option would classify its components?

1. High sensitivity fluorescent dye penetrant, solvent removable and nonaqueous

2. Water-soluble penetrant, type I developer

3. Non-fluorescent dye penetrant, water removable

4. Low sensitivity dye penetrant, oil-based

The correct answer is: High sensitivity fluorescent dye penetrant, solvent removable and nonaqueous

A penetrant system classified as Type 1 refers specifically to those systems that utilize fluorescent penetrants. These are designed to detect very fine surface discontinuities, making them suitable for applications requiring high sensitivity. The components of a Type 1 system must include a penetrant that can fluoresce under ultraviolet (UV) light, enhancing the visibility of indications. In this context, the option describing a high sensitivity fluorescent dye penetrant, solvent removable and nonaqueous aligns perfectly with the criteria set for Type 1 penetrant systems. High sensitivity is essential in ensuring that minute defects can be detected, while the fluorescent nature adds the capability to identify these defects effectively under UV light. Additionally, the solvent removable characteristic indicates that the penetrant can be cleaned up without causing significant contamination or damage to the component being inspected, thereby following proper NDT practices. Options that include water-soluble penetrants or non-fluorescent dye penetrants do not meet the Type 1 criteria because they either lack the fluorescence necessary for high-sensitivity applications or utilize different removal methods (like being water-soluble) that do not align with Type 1 characteristics. Thus, the correct classification for a Type 1 penetrant system is indeed represented by the first option, as it