NDT - Non-Destructive Testing Visual Testing Fundamentals Questions and Answers

Question 1

An inspector is performing a direct visual examination of a weld on a pressure vessel. According to common NDT standards, what are the typical requirements for viewing distance and angle?

Accepted Answer

Within 24 inches and at an angle not less than 30 degrees.

Answer

Within 48 inches and at an angle not less than 45 degrees.

Answer

Within 36 inches and at an angle between 30 and 60 degrees.

Answer

There are no specific requirements for distance or angle.

Question 2

Which of the following is a primary advantage of using a videoscope over a traditional fiberscope for remote visual inspection?

Accepted Answer

Videoscopes produce a higher resolution digital image that can be easily recorded and stored.

Answer

Videoscopes do not require a light source.

Answer

Videoscopes are typically more flexible and have a smaller diameter.

Answer

Fiberscopes are more durable and less prone to damage.

Question 3

A visual inspector is examining a large, highly polished stainless steel surface and is having difficulty with severe glare, which is obscuring potential fine cracks. Which of the following actions would be MOST effective in mitigating the glare?

Accepted Answer

Changing the angle of the light source and/or the viewing angle.

Answer

Increasing the intensity of the light source directly perpendicular to the surface.

Answer

Using a magnifying glass with a built-in light.

Answer

Cleaning the surface again with a solvent.

Question 4

Which of the following human factors is most likely to negatively impact the reliability of a visual inspection by causing an inspector to misinterpret or fail to recognize a relevant indication?

Accepted Answer

Mental fatigue from long hours of inspection.

Answer

Color blindness, when inspecting a monochrome surface.

Answer

Having above-average near-vision acuity.

Answer

Familiarity with the inspection procedure.

Question 5

An inspector is tasked with performing a visual inspection on the internal bore of a long, narrow pipe that is inaccessible by direct line of sight. Which of the following would be considered an indirect visual testing technique suitable for this task?

Accepted Answer

Employing a borescope to navigate and view the internal surface.

Answer

Using a flashlight and a mirror to view the inside from the pipe opening.

Answer

Using a set of calipers and a depth gauge to measure internal features.

Answer

Conducting a liquid penetrant test on the exterior of the pipe.

Question 6

During the visual inspection of a completed weld, which of the following is NOT typically considered a primary objective of the examination?

Accepted Answer

Identifying the internal grain structure of the weld material.

Answer

Detecting surface-breaking discontinuities such as cracks or porosity.

Answer

Verifying the weld's dimensions and profile against specifications.

Answer

Assessing the overall conformity and surface finish of the weld.