Chemical Engineering - MCQ Practice Questions

A liquid film of thickness δ has a component A diffusing through it with first-order reaction. The Thiele modulus is defined as:

In the penetration theory of mass transfer, the mass transfer coefficient varies with contact time (t) as:

For drying of a wet solid in the constant rate period, the controlling mechanism for mass transfer is:

In a wetted wall column for gas absorption, if the gas film resistance is negligible (R_g ≈ 0), the overall mass transfer coefficient K_g is primarily controlled by:

For the absorption of multiple components from a gas stream into an organic solvent, the selectivity depends on:

In reverse osmosis (RO), the membrane flux equation (Darcy's law for membranes) predicts that flux is: