NDT Visual Testing Fundamentals 2

Question 1

What is the minimum illuminance level (in foot-candles) required for general visual inspection per ASME standards?

Accepted Answer

50 fc

Answer

ASME standards require a minimum illuminance of 50 foot-candles (540 lux) for general visual inspection.

Question 2

During remote visual inspection (RVI), which tool is best suited for inspecting internal bores of small-diameter tubing?

Accepted Answer

Rigid borescope

Answer

Rigid borescopes provide superior image quality and are ideal for straight, small-diameter bores where flexibility is not required.

Question 3

What does the term 'depth of field' mean in the context of visual testing optics?

Accepted Answer

The range of distances over which objects appear acceptably sharp

Answer

Depth of field is the range of distances within which objects remain in acceptable focus without readjusting the optic.

Question 4

Which discontinuity type is MOST likely to be missed during a direct visual inspection of a weld surface?

Accepted Answer

Subsurface lamination

Answer

Subsurface laminations are internal discontinuities not visible at the surface, making them undetectable by direct visual methods.

Question 5

A pit gauge is used during visual testing primarily to measure:

Accepted Answer

The depth of a corrosion pit

Answer

A pit gauge (or depth gauge) is specifically designed to measure the depth of corrosion pits and similar surface depressions.

NDT - Non-Destructive Testing Practice Test