Visual Testing (VT) Practice Exam

What is the angle range for the fore-oblique direction of view bore scope?

1. 0 degrees

2. 1-89 degrees

3. 90 degrees

4. 91-110 degrees

The correct answer is: 1-89 degrees

The fore-oblique direction of view for a bore scope typically spans an angle range from 1 to 89 degrees. This range is significant as it allows for a comprehensive inspection while maintaining a direct line of sight. The ability to survey areas that are slightly off perpendicular is crucial in applications where visual testing is performed, such as in the inspection of pipelines or other components, as it provides flexibility in observation without the need for repositioning the bore scope excessively. When assessing the other options, an angle of 0 degrees would imply a straight, direct line of sight, which does not account for any oblique viewing capabilities. An angle of 90 degrees indicates a completely perpendicular view that does not leverage the advantages of a fore-oblique inspection technique. Lastly, the range of 91-110 degrees extends beyond what is typically classified as fore-oblique, as this range would suggest more of a side view, which is not aligned with the standard definition of a fore-oblique direction of view. Therefore, the correct angle range is indeed from 1 to 89 degrees, accommodating a broad yet precise inspection capability.