Liquid Penetrant Testing Level 2 (PT-2) Practice Exam

What indicates the correct developer coating thickness?

1. An even, snowy white appearance

2. A slightly pinkish background

3. A fine, misting spray

4. A thin, translucent layer

The correct answer is: An even, snowy white appearance

The correct indication of developer coating thickness is an even, snowy white appearance. This visual characteristic suggests that the developer has been applied properly, achieving a uniform thickness that is essential for effective liquid penetrant testing. An even, snowy white appearance enhances the visibility of any penetrant indications that may arise from cracks or flaws during the inspection process. It is important to apply the developer in a way that promotes this desirable outcome. A well-applied developer will create a background that optimally contrasts with potential indications, making it easier for technicians to detect and assess any defects in the tested material. This ensures the reliability and accuracy of the inspection results. In contrast, a slightly pinkish background, a fine misting spray, or a thin, translucent layer could indicate improper application or inadequate coating thickness, which could compromise the testing's effectiveness. For instance, a pinkish background might suggest a misapplication or contamination, while a misting spray may not coat the surface uniformly, leading to missed indications. Similarly, a translucent layer would not provide the necessary contrast for the proper detection of defects.