Non-Destructive Testing (NDT) Practice Test

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At what distance should the developer be applied during a fluorescent penetrant inspection?

2 to 4 inches
6 to 8 inches
10 to 12 inches
12 to 15 inches

The correct answer is: 6 to 8 inches

The application of developer during a fluorescent penetrant inspection is critical for revealing indications that may be present on the surface of the material being tested. The optimal distance for applying the developer is typically between 6 to 8 inches from the surface of the part. This range ensures that the developer is evenly distributed and can effectively adhere to the penetrant, allowing for a clear and precise detection of any surface flaws. This distance provides sufficient coverage and allows for the appropriate amount of developer to settle on the penetrant. Conversely, applying the developer from too far away may result in inadequate coverage or insufficient interaction between the developer and the penetrant, potentially leading to missed indications. Therefore, this 6 to 8 inch range is widely accepted as the best practice in fluorescent penetrant inspection to ensure reliable and accurate results.