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Visual Testing Fundamentals 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 Visual Testing Fundamentals flashcards as text

  1. A visual testing procedure requires 20/40 near vision acuity. What does this specification mean?

    Answer: The inspector must see at 20 feet what a normal eye sees at 40 feet

    20/40 vision means the inspector sees at 20 feet what a person with normal vision sees at 40 feet, indicating reduced acuity.

  2. What is the primary purpose of a comparator (replica tape) in visual testing?

    Answer: To transfer and preserve a 3D impression of a surface for measurement

    Replica tape (such as Testex Press-O-Film) creates a physical impression of a surface profile that can be removed and measured with a micrometer.

  3. When using a flexible video borescope, image distortion at the edges of the field of view is typically caused by:

    Answer: Wide-angle lens geometric distortion

    Wide-angle lenses used in borescopes introduce barrel or pincushion distortion, especially at field edges, which can affect dimensional assessments.

  4. According to SNT-TC-1A, which level of VT certification has the primary responsibility for interpreting and evaluating test results?

    Answer: Level II

    SNT-TC-1A Level II personnel are qualified to set up, calibrate, conduct, and interpret/evaluate VT results.

  5. Which condition would MOST adversely affect a visual inspector's ability to detect color-contrast discontinuities?

    Answer: Red-green color vision deficiency

    Red-green color deficiency impairs the ability to distinguish contrast between certain colors, which can mask discontinuities highlighted by color-contrast methods.

  6. The term 'field of view' in optical aids used for VT refers to:

    Answer: The total area visible through the device at a given distance

    Field of view is the total area that can be observed through an optical device at a specified distance or magnification setting.

  7. What type of weld discontinuity is characterized by base metal that has been melted away and not replaced by weld metal, leaving a groove along the weld toe?

    Answer: Undercut

    Undercut is a groove melted into the base metal at the weld toe that is left unfilled, creating a stress concentration.