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
Which condition is a visual inspector REQUIRED to document even if it does not exceed the accept/reject criteria?
Answer: All observations that might affect fitness for service, per the applicable code
Many codes require that all relevant indications, even those within acceptance limits, be recorded for fitness-for-service trending and future comparison.
In visual testing, 'transillumination' technique involves:
Answer: Passing light through a translucent material to reveal internal variations
Transillumination (back-lighting) shines light through thin translucent materials so internal voids, inclusions, or density variations cast visible shadows.
What is the primary advantage of using a video borescope over a traditional fiberscope for remote visual inspection?
Answer: No image pixelation and higher resolution digital imaging
Video borescopes use a CCD/CMOS sensor at the tip rather than fiber bundles, eliminating the honeycomb pixelation and providing significantly higher image resolution.
A visual inspector notices a crack that appears to run parallel to the direction of the applied stress on a pressure vessel. This orientation is:
Answer: Less critical than a transverse crack in most cases
Cracks parallel to the primary stress direction are generally less critical because the stress field does not tend to open them; transverse cracks are more dangerous.
Which type of corrosion would produce a visually uniform, even thinning over a broad surface area rather than localized pitting?
Answer: General (uniform) corrosion
General corrosion attacks the surface evenly across a broad area, resulting in uniform thickness loss that can be measured by comparing to original dimensions.
What is the purpose of a 'calibrated' measuring tape or scale placed in a remote visual inspection image?
Answer: To provide a dimensional reference for measuring discontinuities in the image
A calibrated reference scale placed adjacent to a discontinuity allows dimensional measurements to be made from the recorded image by comparison.
Under ASNT SNT-TC-1A, the minimum hours of on-the-job training for a VT Level II candidate with no prior Level I experience is typically:
Answer: 200 hours
SNT-TC-1A recommends 200 hours minimum on-the-job training for VT Level II certification when the candidate has not previously held Level I status.