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Draft tubes _____ crystal-crystal attrition. Crystals _____ bottom.

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Draft tubes _____ crystal-crystal attrition. Crystals _____ bottom.

(a) Increase, should be kept on

(b) Increase, should be kept off

(c) Decrease, should be kept on

(d) Decrease, should be kept off

This question was posed to me in semester exam.

This question is from Unit Operations topic in chapter Equilibrium Stage Operations, Unit Operations – Extraction, Crystallization and Filteration of Food Engineering

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Right choice is (d) Decrease, should be kept off

Easy explanation: Draft tubes decrease crystal-crystal attrition. Crystals should be kept off bottom so as to encourage crystal growth.

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