Food Processing Technology I - Size Reduction
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Questions and Answers

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

  • It is dissipated as heat (correct)
  • It causes fractures in lines of weakness
  • It transforms into strain energy
  • It creates new surfaces
  • In the stress-strain diagram, what does the point Y represent?

  • Breaking point
  • Region of ductility
  • Elastic limit
  • Yield point (correct)
  • Which type of material is described as soft, weak, and brittle?

  • Material 2
  • Material 3
  • Material 1
  • Material 4 (correct)
  • 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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