Chemical Engineering - MCQ Practice Questions

The relationship between mass transfer coefficient and diffusivity is given by the Chilton-Colburn analogy. If diffusivity doubles while other conditions remain constant, how does the mass transfer coefficient change (assuming laminar flow)?

In a distillation column operating at steady state, the mass transfer rate is governed by which of the following equations?

A packed column is being used for absorption of SO₂ from air using water. The overall mass transfer coefficient K_L is related to individual coefficients by which relation?

The Sherwood number (Sh) correlates with Reynolds (Re) and Schmidt (Sc) numbers. For flow over a flat plate in laminar regime, which expression is approximately correct?

In a counter-current liquid-liquid extraction process, the extraction becomes more efficient when the difference between equilibrium and operating lines increases. What does this signify?

What is the primary assumption made in the penetration theory of mass transfer?

In a membrane separation process, the permeance of a membrane is defined as flux per unit driving force. What are the typical units of permeance in SI system?

The mutual diffusivity D_AB of a binary system is NOT a function of which of the following?

In a cocurrent absorption tower where gas and liquid flow in the same direction, compared to counter-current operation:

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

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:

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:

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:

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

In a packed column absorption operation, the overall mass transfer coefficient KG is related to individual phase coefficients by:

The Sherwood number (Sh) in mass transfer is analogous to which number in heat transfer?