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Nondestructive Examination Methods Flashcards

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

Read the first 7 Nondestructive Examination Methods flashcards as text

  1. What is the purpose of a couplant in contact ultrasonic testing?

    Answer: To exclude air between the transducer and test surface and improve sound transmission

    Couplant fills the air gap between the transducer and test surface, allowing efficient transmission of ultrasonic energy into the material.

  2. A radiograph shows a dark circular spot with a lighter center. This indication is most consistent with:

    Answer: Tungsten inclusion

    A tungsten inclusion appears as a lighter (whiter) area due to its high density, while the surrounding area may be darker; a dark spot with a lighter center is characteristic of a tungsten inclusion.

  3. When performing PT on a part in direct sunlight, which type of penetrant is most appropriate?

    Answer: Visible dye (color contrast) penetrant

    Visible dye (color contrast) penetrant does not require UV light and can be used in ambient lighting conditions including sunlight.

  4. In magnetic particle testing, which magnetization technique is best for detecting discontinuities oriented parallel to the length of a cylindrical bar?

    Answer: Circular magnetization (head shot)

    Circular magnetization creates a field perpendicular to the bar's axis, making it most sensitive to longitudinally oriented (lengthwise) discontinuities.

  5. Which of the following is a characteristic of the 'near field' (Fresnel zone) in ultrasonic testing?

    Answer: Sound pressure varies erratically, making near-field inspection unreliable

    The near field is characterized by complex, erratic sound pressure variations that can cause false indications or missed defects.

  6. For radiographic testing of a butt weld, which ASME code parameter defines the maximum allowed geometric unsharpness (Ug)?

    Answer: Material thickness being radiographed

    ASME Section V Table T-285 specifies maximum Ug values based on the material thickness being radiographed.

  7. An eddy current probe shows a 'lift-off' signal. What does this indicate?

    Answer: The probe is not in consistent contact with the test surface

    Lift-off signal occurs when the probe-to-surface distance varies, causing a change in the coil's impedance that can mask true discontinuity signals.