Chemical Engineering - MCQ Practice Questions

In the context of mass transfer, what does the Schmidt number (Sc) represent?

Which of the following equations is used to calculate the mass transfer coefficient in laminar flow over a flat plate?

In a gas absorption process using a packed tower, if the interfacial area 'a' increases, how does it affect the mass transfer rate?

For a binary diffusion process, the flux equation according to Fick's law in terms of mole fractions is given by:

A gas absorption column operates at steady state. The overall mass transfer coefficient K_G is determined to be 2.5 kmol/(m²·s·atm). If the driving force is 0.8 atm, what is the mass flux?

Which correlation is commonly used for mass transfer in turbulent pipe flow?

In a distillation column, the interface equilibrium at the liquid-vapor boundary can be described by:

For a countercurrent liquid-liquid extraction process, the Kremser equation is used. What is the minimum number of stages required if the separation factor is 2.0 and the extraction factor is 1.5?

The mass transfer coefficient k_L in liquid phase absorption typically has units of:

In a membrane separation process, the Sherwood number (Sh) for mass transfer at the membrane surface is defined as:

A stripping operation is being designed to remove dissolved CO₂ from water using air. The mass transfer is primarily limited by:

The mass transfer rate from a solid sphere dissolving in a flowing liquid can be described using the Ranz-Marshall correlation. Which parameter is NOT included in this correlation?

In a wetted wall column for gas absorption, the liquid film thickness (δ) affects the mass transfer rate. Increasing δ will:

For a dilute binary gas mixture diffusing through a stagnant layer, the diffusion coefficient D_AB can be estimated using the Chapman-Enskog theory. Which statement is correct?

In an adsorption process on activated carbon, the Langmuir isotherm is given by q = (q_m * K * C)/(1 + K*C). What does 'q_m' represent?

For simultaneous momentum and mass transfer in a boundary layer, the Chilton-Colburn analogy relates j_D to friction factor f_D by:

In gas-liquid mass transfer, the Henry's Law constant (H) represents the:

A spray tower is used for absorption where droplets fall through a rising gas stream. The interfacial area in such a system primarily depends on:

For a hollow fiber membrane contactor used in gas-liquid mass transfer, the overall mass transfer coefficient K_OL is related to individual coefficients by:

In the design of a sieve tray distillation column, the mass transfer efficiency (Murphree efficiency) accounts for: