Mass Transfer
HETP is numerically equal to HTU, only when the operating line

And equilibrium lines are parallel
Lies below the equilibrium line
Lies above the equilibrium line
Is far from the equilibrium line

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Mass Transfer
In case of a desorber (stripper), the

Operating line always lies above the equilibrium curve
Temperature remains unaffected
Operating line always lies below the equilibrium curve
Temperature always increases

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Mass Transfer
In case of absorption with exothermic reaction, for fluids having

Pr = Sc = 1; total mass, momentum and thermal diffusivity will be the same
Pr = Sc; percentage change in heat and mass transfer flux will be the same for a given change in the degree of turbulence
Pr = Sc ; there won
Both A & B

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