Discussion
Consider the following pairs of constraint and its origin:
Obstacle limitation height limit - Aviation requirements near an airfield
Minimum exit velocity - Downwash avoidance
Acid-resistant lining - Gas below its dew point
Multi-flue construction - Reducing the total mass emitted
How many of the pairs given above are correctly matched?
Answer: D
Correct answer: Only three
Three are correctly traced: the height limit comes from aviation obstacle rules, the minimum exit velocity from the need to avoid downwash, and the acid-resistant lining from the gas being below its dew point. The fourth is wrong - a multi-flue stack exists to carry several sources in one structure, and reduces no emissions whatever.
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