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A. The slope of the stripping line is always less than unity
B. For a given separation in a binary distillation column, with increase in reflux ratio (above the
minimum reflux ratio), the fixed cost of the distillation column first increases and then
decreases
C. In Ponchon-Savarit method of no. of theoretical plate determination, the stripping and
rectifying operating lines are vertical at total reflux

D. Kremser-Brown-Souder’s equation is used to calculate the efficiency of a plate tower

Correct Answer: C. In Ponchon-Savarit method of no. of theoretical plate determination, the stripping and
rectifying operating lines are vertical at total reflux

Last Updated: February 18, 2019