Quiz on Biochemical Engineering: Rheology and Mixing

What is the primary focus of rheological data evaluation?

• Measuring viscosity

• Measuring temperature

• Measuring pressure

• Measuring density

Which viscometer is known for its simplicity and ease of use?

• Capillary tube viscometer

• Extrusion rheometer

• Coaxial cylinder viscometer

• Cone-and-plate viscometer

What does the Power-law model help to determine in non-Newtonian fluids?

• Temperature and pressure

• Shear stress and shear strain

• K and n values

• Viscosity and density

What is the purpose of mixing in fermentation broths?

• To increase temperature

• To maintain cell suspension

• To reduce viscosity

• To eliminate gas bubbles

Which of the following is NOT a type of viscometer mentioned?

• Cone-and-plate viscometer

• Coaxial cylinder viscometer

• Rotational viscometer

• Extrusion rheometer

What is the effect of sparging gas in a fermentation broth?

• Increases viscosity

• Decreases density

• Increases shear stress

• Reduces mixing efficiency

What is the relationship between shear stress and shear strain in a cone-and-plate viscometer?

• Linear relationship

• Exponential relationship

• Inverse relationship

• No relationship

What is the main disadvantage of using an extrusion rheometer?

• Not suitable for non-Newtonian fluids

• Requires high temperatures

• Complex instrumentation

• Not suitable for suspensions with solids

What does the Reynolds number help to determine?

• Viscosity of the fluid

• Type of flow (laminar or turbulent)

• Power required for mixing

• Shear stress in the fluid

Which type of mixing equipment is commonly used in fermentation processes?

• Centrifuge

• Continuous flow reactor

• Stirred tank fermenter

• Batch reactor