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Which of the following is the best for the examination of surface finish?

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Which of the following is the best for the examination of surface finish?

(a) Touch inspection

(b) Visual inspection

(c) Scratch inspection

(d) Microscopic inspection

I had been asked this question in a job interview.

Question is from Methods of Measuring Surface Finish topic in chapter Measurement of Surface Finish of Engineering Metrology

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Best answer
The correct choice is (d) Microscopic inspection

To explain: Microscopic inspection is the best method for examining the surface finish. Visual, touch and scratch inspection methods are not as accurate as microscopic. In these methods, minute flaws can’t be detected.

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