Question

Under which group, does waviness in surface falls?

(a) Primary texture

(b) Secondary texture

(c) Tertiary texture

(d) Quaternary texture

This question was addressed to me by my school principal while I was bunking the class.

The doubt is from Meaning of Surface Texture topic in chapter Measurement of Surface Finish of Engineering Metrology

Answer 1

Right choice is (b) Secondary texture

Best explanation: If the hills and valleys are not close to each other or they both are far apart, it is due to the machine tool imperfections and this is referred to as waviness or secondary texture.