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Materials Testing & Quality Assurance Flashcards

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

Read the first 7 Materials Testing & Quality Assurance flashcards as text

  1. A soil sample has a liquid limit of 45 and a plastic limit of 20. What is the plasticity index (PI)?

    Answer: 25

    Plasticity Index = Liquid Limit − Plastic Limit = 45 − 20 = 25, representing the range of moisture content over which soil behaves plastically.

  2. What property does a Shore durometer test measure?

    Answer: Surface hardness of rubber and plastics

    A Shore durometer measures the resistance of soft materials like rubber and plastics to permanent indentation, reported on the Shore A or Shore D scale.

  3. What does a positive material identification (PMI) test verify?

    Answer: The alloy composition of a metal component

    PMI uses XRF or OES spectroscopy to verify that a component's elemental composition matches the specified alloy grade.

  4. During a tensile test, a steel specimen necks and fractures. What does necking indicate about the material's behavior?

    Answer: Onset of localized plastic deformation after ultimate tensile strength

    Necking occurs after ultimate tensile strength is reached, when plastic deformation localizes in a reduced cross-section area until fracture.

  5. In ultrasonic testing, what is the primary advantage of phased array ultrasonic testing (PAUT) over conventional single-element UT?

    Answer: PAUT electronically steers and focuses the beam without moving the probe

    Phased array UT uses multiple elements fired in timed sequences to electronically steer, focus, and sweep the beam, providing faster and more comprehensive coverage than a single-element probe.

  6. Which ASTM standard covers the standard specification for carbon structural steel, commonly referred to as A36 steel?

    Answer: ASTM A36

    ASTM A36 is the specification for carbon structural steel used widely in construction, with a minimum yield strength of 36 ksi.

  7. A weld is specified as requiring 100% radiographic examination per ASME Section V. What does '100% RT' mean?

    Answer: The entire length of every production weld is radiographically examined

    100% RT means that radiographic examination is performed along the complete length of every weld joint, with no portion left uninspected.