Non-Destructive Testing (NDT) Practice Test

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What challenge might you face performing an FPI inspection on a sunny day in April?

  1. High humidity affecting the penetrant

  2. Lack of adequate lighting

  3. Presence of glare due to bright sunlight

  4. Temperature below the required levels

The correct answer is: Presence of glare due to bright sunlight

Performing a Fluorescent Penetrant Inspection (FPI) on a sunny day can present significant challenges, particularly due to the presence of glare from bright sunlight. Glare can interfere with the visibility of the fluorescent indications produced by the penetrant material. For effective detection of defects, the area being inspected must be dimly lit to allow the fluorescent indications to stand out clearly against the background. Bright sunlight can wash out these indications, making it difficult to identify flaws such as cracks or voids. This difficulty in seeing the fluorescent marks directly impacts the reliability of the inspection results, potentially leading to missed defects. Proper inspection conditions are crucial for the success of FPI, and managing environmental factors like sunlight is vital for achieving accurate results.

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