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The turndown ratio is defined as the ratio of?

(a) Design vapor to operable throughput

(b) Entrainment to Velocity

(c) Tray height to Diameter

(d) Gas to flooding velocity

The question was asked in an internship interview.

I need to ask this question from Tray Capacity Limits in division Tray Design and Operation of Distillation Design

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Correct choice is (a) Design vapor to operable throughput

The explanation is: The turndown ratio is defined as the ratio of Design vapor to operable throughput, sieve trays have a low turn down ratio.

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