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GATE 2024 ES – Question 18

Water and Wastewater Treatment and Management · Water Treatment · 1 mark · Multiple choice

Match rapid-filter mechanisms i Straining, ii Sedimentation, iii Interception, iv Diffusion with P Particles caught in pores, Q Large/heavy particles leave streamlines and settle on grains, R Streamline-following particles brush grains due to their size, S Brownian particles collide with grains.

  1. i–S, ii–P, iii–Q, iv–R
  2. i–Q, ii–R, iii–S, iv–P
  3. i–R, ii–S, iii–P, iv–Q
  4. i–P, ii–Q, iii–R, iv–S

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Show answer and explanation

Correct answer: (D) i–P, ii–Q, iii–R, iv–S

Explanation

Straining is geometric trapping in a pore. Sedimentation involves gravitational settling onto collector grains. Interception occurs when a particle’s finite radius reaches a grain despite its center following a streamline. Brownian diffusion causes random collisions of very small particles. Thus **i–P, ii–Q, iii–R, iv–S, D**.

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