Discussion
Assertion (A): Gravity settling chambers are used only as pre-cleaners.
Reason (R): Stokes settling velocity varies with the square of the particle diameter.
Select the correct answer from the options below.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Since Stokes velocity varies as \( d^2 \), a particle of a tenth the diameter settles a hundred times more slowly, so a chamber sized to catch fine material would be impossibly long. The chamber therefore takes out the coarse fraction cheaply and at almost no pressure drop, and something else - a filter, a precipitator, a scrubber - deals with the rest.
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