Mass Transfer
Which of the following same diameter columns gives lowest pressure drop per unit height?

Randomly packed column
Packed column (stacked)
Sieve-plate column
Bubble-cap column

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Mass Transfer
In case of an absorber, the operating

Line can be either above or below the equilibrium curve
Line always lies below the equilibrium curve
Velocity is more than the loading velocity
Line always lies above the equilibrium curve

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