Mass Transfer
In a packed tower, the value of HETP equals HTUOG, when the equilibrium and the operating lines are (where, HETP = height equivalant to a theoretical plate HTUOG = overall gas phase height of a transfer unit)

Straight
Parallel
Neither A nor B
Both A & B

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Mass Transfer
The McCabe Δ L law states that the

Linear crystal growth rate depends on the crystal size
Linear crystal growth rate does not depend on the crystal size
Linear crystal growth rate depends on the degree of supersaturation
Molar heats of vaporisation of components are nearly equal

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