Process Equipment and Plant Design
Bubble cap plate column is

Used only for distillation, not for absorption
A finite stage contactor
A continuous contactor
A differential stage contactor

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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

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

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Process Equipment and Plant Design
A stuffing box is used for

Prevention of fluid leakage around moving parts
Reducing the resistance of fluid flow
Absorbing the contraction/expansion of pipeline due to temperature changes
Facilitating smooth opening and closing of a valve

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