Non-Destructive Testing (NDT) Practice Test

Which method of penetrant removal is described as post emulsified, lipophilic?

1. Method A

2. Method B

3. Method C

4. Method D

The correct answer is: Method B

The method described as post-emulsified, lipophilic refers to a process in penetrant testing where the penetrant is first applied to the surface, allowing it to seep into any defects or voids. After this initial application and dwell time, a post-emulsifier is used to remove the excess surface penetrant. The key characteristic of this method is that the post-emulsifier is lipophilic, meaning that it is capable of mixing with oils and the penetrant, allowing it to effectively emulsify and wash away the penetrant from the surface without disturbing the penetrant that has entered the defects. This process ensures that the excess penetrant is effectively removed, leaving only the penetrant that has entered any flaws. It is typically used in situations where the penetrant has a certain viscosity and requires a specific emulsification technique to provide accurate results. In contrast, other removal methods may rely on water or other less specific emulsifying agents, which may not be as effective with certain formulations of penetrants or surface conditions. Thus, the identification of the method as post-emulsified, lipophilic aligns with established protocols in penetrant testing methodologies.