Mass Transfer
Absorption factor method is used to calculate the number of ideal stages, when

Operating line lies above the equilibrium line
Both operating and equilibrium lines are parallel
Operating line lies below the equilibrium line
Pressure drop in the column is very high

ANSWER DOWNLOAD EXAMIANS APP

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

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

ANSWER DOWNLOAD EXAMIANS APP