4. Food Processing and Engineering

Mixing And Unit Operations — Quiz

Test your understanding of mixing and unit operations with 5 practice questions.

Practice Questions

Question 1

In the context of non-Newtonian fluid mixing, which dimensionless number is most critical for characterizing the power consumption of an impeller in a baffled tank, especially when considering pseudoplastic fluids?

Question 2

A food engineer is designing a continuous separation system for a suspension containing fine, dense solid particles in a low-viscosity liquid. To achieve high separation efficiency and throughput, which type of centrifugal separator would be most appropriate, and why?

Question 3

During the filtration of a fruit juice concentrate, the filter cake resistance is observed to increase significantly over time, leading to a rapid decrease in flux. If the filtration is operating under constant pressure, which of the following modifications would be most effective in mitigating this issue without compromising product quality?

Question 4

Consider a homogenization process where a liquid food product is passed through a narrow gap at high velocity, resulting in a pressure drop. According to Bernoulli's principle, how does this pressure drop contribute to the reduction of particle size and stabilization of emulsions?

Question 5

In a food processing operation, a mixture of two immiscible liquids with different densities needs to be separated continuously. Which unit operation, based on the principle of gravitational or centrifugal force, would be most suitable for this task?