Process Equipment and Plant Design
To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of

(1.2)3/5
(1.2)2/3
(1.2)3/2
(1.2)5/3

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Process Equipment and Plant Design
Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the

Liquid/vapor loading across the column remains constant
Sensible heat differences are small, because the temperature changes from tray to tray is small
All of these
Trouton's rule is applicable

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