Discussion
Statement I: Reducing stack diameter at constant flow raises exit velocity.
Statement II: Velocity is the volumetric flow divided by the cross-sectional area.
In the light of the above statements, choose the correct answer.
Answer: A
Correct answer: Both Statement I and Statement II are correct
Statement II is simply the arithmetic behind statement I. With \(v = Q/A\) and \(A = \pi d^2/4\), reducing the diameter at constant flow raises velocity as \(1/d^2\). The cost is a draught loss rising roughly with \(v^2\).
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