Question

At optimum reflux ratio,

(a) Operating  and optimum cost are equal

(b) Operating  and fixed cost are equal

(c) Fixed and optimum cost are equal

(d) Total and optimum cost are equal

This question was addressed to me by my school principal while I was bunking the class.

Enquiry is from Cost Variance with Reflux Ratio in division Distillation of Mass Transfer

Answer 1

Correct answer is (b) Operating  and fixed cost are equal

To explain I would say: To get the optimum cost the cost used for the trays and other devices should be the same.