GATE ME 2021 Set 1 — Question 20
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Metrology, CIM & Additive Mfg → Metrology & Inspection → Form & Surface Finish
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Question
Consider the surface roughness profile as shown in the figure.
The center line average roughness (, in ) of the measured length () is
Correct answer
(B) 1
Solution
The center line average roughness () is defined as the arithmetic mean of the absolute values of the profile height deviations from the mean line over the sampling length :From the given roughness profile, the height alternates between and over intervals of . Therefore, the absolute value is constant and equal to for the entire length .
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