M

Mr. Dubey • 52.30K Points
Coach

Q. 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.

(A) 0.0001 mm
(B) 0.001 mm
(C) 0.01 mm
(D) 0.1 mm
Correct : Option (C)

Explanation:
 touch inspection method can tell which surface is rougher. in this method, the finger-tip is moved along the surface at a speed of about 25/sec and the irregularities of about 0.01 mm can be easily detected.

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