Discussion
Statement I: Exit velocity is specified above about one and a half times the wind speed.
Statement II: Below that ratio the plume is drawn into the low pressure wake immediately behind the stack.
In the light of the above statements, choose the correct answer.
Answer: D
Correct answer: Both Statement I and Statement II are correct
Statement II explains statement I. The wind separates round the stack and leaves a low-pressure wake immediately downwind; a plume leaving too slowly is drawn into it instead of rising, and the effective height collapses. Requiring an exit velocity of about 1.5 times the wind speed keeps the jet clear of that wake.
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