Chemical Engineering - MCQ Practice Questions

In a continuous contacting device, the operating line is obtained from which fundamental principle?

The penetration theory for mass transfer assumes that:

For simultaneous heat and mass transfer in a cooling tower, the Lewis number (Le = α/D) typically has a value of:

In distillation, the Murphree plate efficiency is defined as the ratio of:

For gas absorption in a plate column, the gas-phase mass transfer coefficient increases with:

The concept of 'equivalent theoretical stages' in absorption is based on:

In evaporative cooling, the effectiveness (ε) is defined as:

In membrane separation processes, the selectivity is expressed as:

The Fick's first law of diffusion in binary mixtures states that the molar flux J_A is proportional to:

For equimolar counter-diffusion in a binary system, the molar fluxes satisfy:

The Stefan problem in mass transfer involves:

In a countercurrent absorption column, if the gas-phase mass transfer coefficient is k_G = 0.05 kmol/(m²·s·atm), the interfacial area 'a' = 200 m²/m³, and column cross-section = 5 m², the volumetric overall mass transfer coefficient is:

The penetration theory for mass transfer assumes that the contact time between fluid elements is:

For absorption of a sparingly soluble gas in a liquid with fast reaction kinetics, the enhancement factor 'E' is determined by:

In membrane separation, the permeate flux in reverse osmosis is given by:

A gas A diffuses through a stagnant film of gas B. If the diffusivity D_AB = 0.1 cm²/s, film thickness δ = 0.01 cm, and concentration difference = 0.05 mol/cm³, the diffusive flux is:

The height of a transfer unit (HTU) in a packed absorption column represents:

In a binary gas mixture, if component A is highly soluble in the liquid phase compared to component B, which statement is true regarding absorption?

For absorption of sparingly soluble gas in a liquid film, the operating line and equilibrium curve relationship determines:

In distillation, the Murphree plate efficiency is always: