Interviewers ask this kind of question to surface how you think, not what you remember. The strongest answers are specific, calmly told, and end on what changed.
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Catalyst activity in a continuous reactor has been declining faster than the model predicted, and you can't tell whether it's normal aging, a poison in the feed, or a fouling issue. Replacing the charge means a costly shutdown; pushing on risks a deeper deactivation. What do you decide with the data you have?
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