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Material Properties & Inspection Standards 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 Material Properties & Inspection Standards flashcards as text

  1. What NDT method is most effective for detecting surface-breaking cracks in ferromagnetic boiler components?

    Answer: Magnetic particle testing

    Magnetic particle testing (MT) is highly effective for detecting surface and near-surface discontinuities in ferromagnetic materials such as carbon and low-alloy steels.

  2. What is 'creep' in boiler material behavior?

    Answer: Slow, time-dependent plastic deformation under sustained load at elevated temperature

    Creep is the gradual, permanent deformation of a material under constant stress at high temperatures over an extended period.

  3. According to ASME standards, what is the minimum required weld joint efficiency for a double-welded butt joint in a pressure vessel subjected to radiographic examination?

    Answer: 1.00

    A double-welded butt joint that has been fully radiographed is assigned a joint efficiency of 1.00 per ASME Section VIII, Division 1.

  4. In material science, what does the 'modulus of elasticity' (Young's modulus) represent?

    Answer: The ratio of stress to strain in the elastic region

    Young's modulus is the slope of the linear portion of the stress-strain curve and measures a material's stiffness in the elastic range.

  5. Which of the following inspection standards is used specifically for the qualification of NDE personnel in the US?

    Answer: ASNT SNT-TC-1A

    ASNT SNT-TC-1A is the recommended practice for the qualification and certification of NDE personnel in the United States.

  6. What does 'sensitization' mean for austenitic stainless steel used in boiler applications?

    Answer: Precipitation of chromium carbides at grain boundaries, reducing corrosion resistance

    Sensitization occurs when austenitic stainless steel is heated in the 425–870°C range, causing chromium to diffuse to grain boundaries and form carbides, depleting the surrounding area of chromium.

  7. When performing a liquid penetrant test, what is the purpose of the developer?

    Answer: Draw penetrant out of discontinuities to form visible indications

    The developer absorbs penetrant trapped in discontinuities through capillary action, forming enlarged, visible indications on the surface.