Discussion
Statement I: A gravity settling chamber is unsuitable for fine particulate.
Statement II: Stokes settling velocity varies with the square of the particle diameter.
In the light of the above statements, choose the correct answer.
Answer: C
Correct answer: Both Statement I and Statement II are correct
Both are true and the second explains the first. Stokes settling velocity is
\[ v = \frac{(\rho_p - \rho)gd^2}{18\mu} \]so halving the diameter quarters the velocity. A 100 micrometre particle settles in seconds; a 10 micrometre particle takes a hundred times as long, and a chamber long enough to catch it would be absurdly large. Settling chambers therefore serve only as pre-cleaners for coarse material.
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