M

Mr. Dubey • 52.30K Points
Coach 

Q. Which of the following is a destructive method in measuring surface finish?

(A) gloss measurement
(B) taper sectioning
(C) diffraction technique
(D) micro interferometer
Correct : Option (B)

Explanation: 
 in taper sectioning method, a section is cut through the surface to be inspected at a shallow angle, thus magnifying height variations by a factor of cot theta, and the section is studied by optical microscope. it is an accurate but destructive method.

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