Question

Which of the following is a criterion of a good bearing surface?

(a) Positive skew

(b) Negative skew

(c) Negative peak roughness

(d) Positive start up length

I have been asked this question in an online interview.

I'd like to ask this question from Terminology as per Indian Standards in portion Measurement of Surface Finish of Engineering Metrology

Answer 1

Right answer is (b) Negative skew

Explanation: Skew will show whether porous, sintered and cast iron surfaces will yield a meaningful Ra (arithmetic mean deviation from the mean line of profile) measurement. Negative value of skew is the criterion for a good bearing surface.