Question

What is the tube diameter of rigid borescope?

(a) 0.1 to 10 mm

(b) 0.5 to 90 mm

(c) 0.2 to 100 mm

(d) 0.9 to 70 mm

The question was asked in an internship interview.

I'm obligated to ask this question of Visual Inspection topic in section Machine Vision Systems of Engineering Metrology

Answer 1

Right choice is (d) 0.9 to 70 mm

The explanation: The borescope’s applications are limited with a straight line path between the observer and surface to be observed. The diameter of tube of rigid borescope may range from 0.9 to 70 mm and length from 0.15 to 30 metres.