Question

For testing straightness with the help of spirit level, what is the length of each surface section?

(a) Equal to spirit level base length

(b) Greater than spirit level base length

(c) Less than spirit level base length

(d) Doesn’t depend upon spirit base length

I have been asked this question in a job interview.

This interesting question is from Test for Straightness by using Spirit Level and Autocollimator topic in section Straightness, Flatness, Squareness, Parallelism, Circularity and Rotation of Engineering Metrology

Answer 1

Correct choice is (a) Equal to spirit level base length

The explanation is: For determining straightness, a straight line is drawn on the surface. It is divided into sections, the length of individual section is equal to the length of the base of spirit level or the base of a reflector in case of autocollimator.