Question

Statement 1: As mesh size increases, the aperture size decreases.

Statement 2: In British standards, the ratio of the aperture size of two consecutive screens is a ratio of 1.412.

(a) True, False

(b) True, True

(c) False, False

(d) False, True

This question was addressed to me in an interview for job.

I would like to ask this question from Unit Operations in division Sedimentation and Centrifuge, Mixing, Size Reduction and Separation and Material Handling and Transportation of Food Engineering

Answer 1

Correct answer is (a) True, False

The explanation is: As mesh size increases, the aperture size decreases. Mesh size refers to the number of mesh openings present in one inch. Hence as the aperture seize increases, the number of meshes per inch decrease. In Tyler series, the ratio of the aperture size of two consecutive screens is a ratio of 1.412. (Square root of 2)