Question

What is value of surface finish achieved, when we use the abrasive of grit number 240?

(a) 0.01 – 0.08 μm

(b) 0.08 – 0.13 μm

(c) 0.13 – 0.25 μm

(d) 0.25 – 0.38 μm

I got this question in an international level competition.

I want to ask this question from USM topic in portion Mechanical Processes of Advanced Machining

Answer 1

Right option is (d) 0.25 – 0.38 μm

To explain I would say: The surface roughness obtained, when machined using abrasive of grit number 240, is between 0.25 – 0.38 μm.