Liquid Penetrant Testing Level 1 (PT-1) Practice Exam

Which statement concerning liquid penetrant testing is correct?

1. Fluorescent indications will be seen when exposed to blacklight

2. All penetrant tests require white light

3. Only colored penetrants are visible without light

4. Developers produce indications by absorption

The correct answer is: Fluorescent indications will be seen when exposed to blacklight

The statement regarding liquid penetrant testing that asserts fluorescent indications will be seen when exposed to blacklight is correct. In liquid penetrant testing (PT), fluorescent penetrants contain additives that glow under ultraviolet (UV) light, specifically a blacklight. This property allows for the easy detection of surface-breaking flaws as the bright fluorescent indications stand out against the dark background, making it much easier for technicians to identify potential defects in materials. Utilizing fluorescent penetrants is particularly advantageous in situations where visual inspection might be more challenging, as it enhances contrast and visibility of any indications. This method is commonly preferred in the aerospace, automotive, and various manufacturing industries where ensuring material integrity is critical. In contrast, other options present incorrect statements regarding the fundamentals of liquid penetrant testing. For example, while some penetrant tests do involve white light for specific applications, not all require it, particularly when fluorescent penetrants are used. Similarly, not all penetrants are visible without light; some require specific lighting conditions to be observed effectively. Lastly, developers in PT do not primarily produce indications by absorption; rather, they work by drawing penetrant material from defects to the surface, aiding visual clarity. This understanding of the roles and properties of penetrants and developers is essential for