NDT Visual Testing Fundamentals 5

Question 1

Which condition is a visual inspector REQUIRED to document even if it does not exceed the accept/reject criteria?

Accepted Answer

All observations that might affect fitness for service, per the applicable code

Answer

Many codes require that all relevant indications, even those within acceptance limits, be recorded for fitness-for-service trending and future comparison.

Question 2

In visual testing, 'transillumination' technique involves:

Accepted Answer

Passing light through a translucent material to reveal internal variations

Answer

Transillumination (back-lighting) shines light through thin translucent materials so internal voids, inclusions, or density variations cast visible shadows.

Question 3

What is the primary advantage of using a video borescope over a traditional fiberscope for remote visual inspection?

Accepted Answer

No image pixelation and higher resolution digital imaging

Answer

Video borescopes use a CCD/CMOS sensor at the tip rather than fiber bundles, eliminating the honeycomb pixelation and providing significantly higher image resolution.

Question 4

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:

Accepted Answer

Less critical than a transverse crack in most cases

Answer

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.

Question 5

Which type of corrosion would produce a visually uniform, even thinning over a broad surface area rather than localized pitting?

Accepted Answer

General (uniform) corrosion

Answer

General corrosion attacks the surface evenly across a broad area, resulting in uniform thickness loss that can be measured by comparing to original dimensions.

NDT - Non-Destructive Testing Practice Test

NDT - Non-Destructive Testing Practice Test

NDT Visual Testing Fundamentals 5