Discussion
Assertion (A): Exit velocity is kept above about one and a half times the design wind speed.
Reason (R): Below that ratio the plume is drawn into the low pressure wake behind the stack.
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
The reason states exactly why the assertion holds. Below a ratio of about 1.5 the plume is captured by the low-pressure wake behind the stack and the effective height collapses, so the minimum velocity is specified precisely to keep the jet clear of it.
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