Abrasive grain size of 10 on a grinding wheel refers to:

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Question

This question was previously asked in

SJVN ET Mechanical 2019 Official Paper

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Answer 1

Explanation:

Grinding:

Grinding is the process of removing metal by the application of abrasives which are bonded to form a rotating wheel. When the moving abrasive particles contact the workpiece, they act as tiny cutting tools, each particle cutting a tiny chip from the workpiece.
It is a common error to believe that grinding abrasive wheels remove material by a rubbing action; actually, the process is as much a cutting action as drilling, milling, and lathe turning.

Grain size:

The grain or grit size of your grinding wheel influences the material removal rate and the surface finish and the grain size varies from 8 to 600 (8 is coarse and 600 is very fine).
The grinding wheel grain size controls the possible amount of depth of cut. Bigger grain size protrudes more on the grinding wheel periphery or face resulting in a higher depth of cut and smaller grains protrude less resulting in a lower depth of cut. Hence the size of the chip is fine in the case of smaller grain size wheels.
Large grain size grinding wheel is used for ductile materials.