Particulate Systems and Flowability Improvement Quiz
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Questions and Answers

What is the purpose of size enlargement in particulate systems?

  • To increase the health hazards associated with particles
  • To improve flowability and control solubility in food products (correct)
  • To decrease the bulk density for storage
  • To reduce interparticle friction
  • Which method of agglomeration involves introducing heat?

  • Sintering (correct)
  • Nucleation
  • Granulation or Agitative Agglomeration
  • Compaction or Compressive Agglomeration
  • In the stages of agglomeration rate processes, what happens during layering?

  • Fresh particles are formed by attrition
  • Increase in particle size but not in total mass of particles
  • Particles experience coalescence
  • Material is deposited on the surfaces of nuclei (correct)
  • What is the primary objective of using glidants in particulate systems?

    <p>To reduce interparticle friction and improve flowability</p> Signup and view all the answers

    Which method of agglomeration involves agglomeration by agitation?

    <p>Granulation or Agitative Agglomeration</p> Signup and view all the answers

    Why may fine particles be difficult to discharge from hoppers?

    <p>As a result of vibration or mechanical stirring</p> Signup and view all the answers

    Which mechanism involves deforming solids until they break or tear?

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

    What type of force is involved in coarse reduction of hard solids to give fines?

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

    According to Rittinger's Law, what is the relationship between energy required and particle size in product?

    <p>Directly proportional</p> Signup and view all the answers

    Which process involves fine pulverization when the size of the product reaches the micrometer range?

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

    What does Walker et al. propose about the energy required for size reduction?

    <p>It is inversely proportional to the size to some power</p> Signup and view all the answers

    In crushing laws, what does Rittinger's Law imply about reducing material from 100 mm to 50 mm compared to 50 mm to 33.3 mm?

    <p>Same energy is required for both reductions</p> Signup and view all the answers

    Which type of analysis is more precise for calculating average particle size, specific surface area, or particle population?

    <p>Cumulative analysis</p> Signup and view all the answers

    What is the basis for determining screen effectiveness in Method 1?

    <p>Recovery in the product of desired material in the feed</p> Signup and view all the answers

    Which factor plays a crucial role in determining the capacity of a screen?

    <p>Ratio of open area to total area on the screen</p> Signup and view all the answers

    What is the formula typically used to calculate the capacity of screens for dense materials like ores?

    <p>$(5 to 20) \times \text{screen area} \times \text{screen aperture per 24 hrs}$</p> Signup and view all the answers

    What distinguishes Method 2 for determining screen effectiveness from Method 1?

    <p>Recovery based on material balance</p> Signup and view all the answers

    How is cumulative analysis different from differential analysis regarding assumptions about particle size?

    <p>Cumulative analysis assumes particles are equal in size within a fraction.</p> Signup and view all the answers

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