The GATE Grind

GATE 2021 ES – Question 46

Air and Noise Pollution · Particulate Pollutants · 2 marks · Multiple select

Which are dominant removal mechanisms for spherical particles below 10 µm in a fabric filter?

  1. Impaction
  2. Gravitation
  3. Interception
  4. Diffusion

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Show answer and explanation

Correct answer: (A) Impaction; (C) Interception; (D) Diffusion

Explanation

Across the sub10 µm range, inertial impaction captures the larger particles, interception captures particles contacting fibres along streamlines, and Brownian diffusion captures the smallest. Select **A, C, D**. Gravitational settling is not the dominant fabric-filtration mechanism for this range.

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