GATE 2022 MT – Question 58
A sieve made of steel wire of diameter 53 µm has an aperture size of 74 µm. Its mesh number is ______ (round off to the nearest integer).
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Correct answer: 197 to 201
Explanation
Sieve pitch is aperture plus wire diameter, $74+53=127$ μm. One inch is 25400 μm. Mesh number is $25400/127=\boxed{200}$.