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 (C)</p> Signup and view all the answers

Which method of agglomeration involves agglomeration by agitation?

<p>Granulation or Agitative Agglomeration (D)</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 (B)</p> Signup and view all the answers

Which mechanism involves deforming solids until they break or tear?

<p>Comminution (C)</p> Signup and view all the answers

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

<p>Impact (D)</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 (B)</p> Signup and view all the answers

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

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

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

<p>Recovery based on material balance (A)</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. (C)</p> Signup and view all the answers

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