Food Processing Technology I - Size Reduction

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What happens to the stress absorbed by the material in a grinding machine?

It is dissipated as heat

In the stress-strain diagram, what does the point Y represent?

Yield point

Which type of material is described as soft, weak, and brittle?

Material 4

What does the general law of comminution equation refer to?

<p>Energy requirement for size reduction</p> Signup and view all the answers

Which region in the stress-strain diagram indicates elastic deformation?

<p>OE</p> Signup and view all the answers

What is the main effect of grinding on absorbed stress within the material?

<p>Dissipation as heat</p> Signup and view all the answers

What is the purpose of size reduction in food processing?

<p>To aid in the extraction of a desired constituent</p> Signup and view all the answers

Which term is used as a generic term for size reduction?

<p>Comminution</p> Signup and view all the answers

What process is referred to when there is a reduction in the size of globules of immiscible liquids?

<p>Homogenization</p> Signup and view all the answers

Which operation involves size enlargement?

<p>Extrusion</p> Signup and view all the answers

Why might a reduction of a food material to a definite size range be necessary?

<p>To meet product specifications or requirements</p> Signup and view all the answers

Why is intimate mixing or blending easier with smaller size ranges of particles?

<p>Because smaller particles have more contact points</p> Signup and view all the answers

What property is closely related to the hardness of a material?

<p>Abrasiveness</p> Signup and view all the answers

Which scale is commonly used to define or determine the hardness of a material?

<p>Hardness scale</p> Signup and view all the answers

What type of force is typically used to fracture crystalline or friable foods?

<p>Compressive forces</p> Signup and view all the answers

How does moisture content affect the milling process with many materials?

<p>Leads to clogging and affects throughput</p> Signup and view all the answers

What can the generation of heat lead to in the food milling process?

<p>Development of sticky substances</p> Signup and view all the answers

What does abrasiveness of bulk solids refer to?

<p>Ability to abrade or wear surfaces</p> Signup and view all the answers

What is the purpose of using Rittinger’s equation in the sample problem provided?

<p>To determine the energy required for size reduction</p> Signup and view all the answers

In the size reduction process, what does Bonds Law primarily focus on?

<p>Energy required for particle reduction</p> Signup and view all the answers

If a motor has a power of 10 hp, how many watts of power does it consume according to the information provided?

<p>$7457$ W</p> Signup and view all the answers

What aspect of size reduction does Rittinger’s Law specifically address?

<p>Energy consumed during the process</p> Signup and view all the answers

Which law is more appropriate as a guide for selecting the type of motor for size reduction from 0.1 cm to 0.01 cm based on the sample problem?

<p>Rittinger’s Law</p> Signup and view all the answers

What is the primary factor considered when estimating the energy requirement for reducing particle sizes in the sample problem?

<p>Particle diameter</p> Signup and view all the answers

What is the purpose of using cooling devices like jackets and coils in the action zone?

<p>To prevent the loss of heat labile components during handling</p> Signup and view all the answers

Which type of equipment is used for fine and ultra-fine size reduction in food process engineering?

<p>Ball mills</p> Signup and view all the answers

What is achieved by shearing forces in size reduction processes?

<p>Release of energy as heat</p> Signup and view all the answers

Which law states that the power required for size reduction is directly proportional to the increase in surface area?

<p>Kick’s Law (n = 1)</p> Signup and view all the answers

Which equipment is primarily used for coarse and intermediate size reduction in food process engineering?

<p>Crushing rolls</p> Signup and view all the answers

Which material can be used for cryogenic grinding to prevent the loss of heat labile components?

<p>Liquid nitrogen</p> Signup and view all the answers

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