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Liquid Penetrant Testing Process Flashcards

7 cards from real NDT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Liquid Penetrant Testing Process flashcards as text

  1. What is the primary purpose of a penetrant sensitivity level designation (e.g., Level 1/2, Level 1, Level 2, Level 3, Level 4)?

    Answer: To classify the penetrant's ability to detect very fine discontinuities

    Sensitivity level ratings classify how well a penetrant system detects fine discontinuities, with higher numbers indicating greater sensitivity.

  2. At what minimum UV-A irradiance (black light intensity) should the inspection surface be maintained when performing fluorescent penetrant testing per ASTM E1417?

    Answer: 1,000 µW/cm²

    ASTM E1417 requires a minimum UV-A irradiance of 1,000 µW/cm² at the inspection surface to ensure adequate fluorescence of indications.

  3. Which type of developer is prohibited for use on parts with blind holes or keyways?

    Answer: Aqueous developer (wet)

    Aqueous (wet) developers can become trapped in blind holes, making complete removal after inspection very difficult and potentially leaving harmful residues.

  4. What happens to liquid penetrant viscosity as the part temperature INCREASES above the normal operating range?

    Answer: Viscosity decreases, which may reduce dwell time effectiveness

    Higher temperatures lower penetrant viscosity and increase evaporation, potentially causing the penetrant to dry in the discontinuity before developer can draw it out.

  5. The term 'bleeding' in liquid penetrant testing refers to:

    Answer: Migration of penetrant from a discontinuity into the developer coating

    Bleeding describes the migration of penetrant out of a discontinuity into the developer layer, forming a visible indication.

  6. Which penetrant method is MOST suitable for large structural components in the field where water rinsing facilities are not available?

    Answer: Solvent-removable (Method C)

    Solvent-removable penetrants (Method C) require only solvent and cloths for excess removal, making them ideal for field inspections without water access.

  7. When interpreting liquid penetrant indications, a linear indication is generally defined as one whose length is at least how many times its width?

    Answer: 3:1

    A linear indication is typically defined as having a length-to-width ratio of 3:1 or greater, suggesting a planar or elongated discontinuity.