Liquid Penetrant Testing Level 1 Practice Exam 2025 – Complete Study Resource

Question: 1 / 400

In PT, what are the indications of defective materials after testing?

Visible marks or lines through the developer layer

Indications of defective materials after liquid penetrant testing include visible marks or lines through the developer layer. This phenomenon occurs when embedded discontinuities, such as cracks or voids, allow trapped penetrant to seep out and create visible evidence in the form of lines or marks against the developer. These markings signify that there's an indication present, which typically denotes a flaw in the material.

Observing no changes in the appearance of the surface does not indicate defects, as it implies that the test was successful with no flaws detected. Color changes in the penetrant may not directly correlate to defects in an object being tested; instead, they could occur due to environmental variables or aging of the penetrant itself, and thus they cannot be relied upon as indicators of material defects. Surface roughness measurements are relevant to evaluating the quality of a surface but do not inform about discontinuities that liquid penetrant testing aims to identify.

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No changes in the appearance of the surface

Color changes in the penetrant

Surface roughness measurements

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