Particle Size Reduction and Its Applications
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Questions and Answers

Which method of size reduction is commonly used for coarse reduction of hard solids, giving relatively few fines?

  • Cutting
  • Impact
  • Compression (correct)
  • Attrition
  • Which machine is commonly used for size reduction and yields very fine products from soft, nonabrasive materials?

  • Compression
  • Impact
  • Cutting
  • Attrition (correct)
  • Which type of size reduction gives a definite particle size and sometimes a definite shape, with few or no fines?

  • Cutting (correct)
  • Impact
  • Compression
  • Attrition
  • What is the generic term for size reduction that includes crushers and grinders as types of equipment?

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

    What is the objective of crushing and grinding in size reduction processes?

    <p>To produce small particles from larger ones</p> Signup and view all the answers

    What is the impact size reduction method commonly used for?

    <p>Medium to coarse products from any material</p> Signup and view all the answers

    According to Rittinger's Law, the work required in crushing is proportional to what?

    <p>The new surface created</p> Signup and view all the answers

    Kick's Law states that the work required from crushing a given mass of material is constant for what specific ratio?

    <p>Initial particle size to final particle size</p> Signup and view all the answers

    What does Bond Crushing Law state regarding the work required to form particles from very large feed?

    <p>It is proportional to the square root of the surface-to-volume ratio of the product</p> Signup and view all the answers

    In terms of comminution, what does 'attrition' refer to?

    <p>Wear due to rubbing and friction</p> Signup and view all the answers

    Which term describes the action of reducing feed material size by forcing it between two surfaces moving in opposite directions?

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

    What type of equipment operation is primarily associated with impact for size reduction?

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

    What is the primary purpose of size reduction in the pharmaceutical industry?

    <p>To grind medicines into powder form</p> Signup and view all the answers

    How does achieving a smaller and more uniform particle size benefit products in both pharmaceutical and chemical manufacturing industries?

    <p>It improves product aesthetics and homogeneity</p> Signup and view all the answers

    Which term describes the process of grinding, crushing, or pulverizing raw materials to achieve the desired particle size in the chemical manufacturing industry?

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

    What role does cutting play in size reduction processes in various industries?

    <p>Dividing large particles into smaller pieces</p> Signup and view all the answers

    In the context of size reduction, what does 'attrition' refer to?

    <p>Gradual wearing down or rubbing away of materials</p> Signup and view all the answers

    'Impact' in size reduction processes involves:

    <p>The sudden collision or striking of materials</p> Signup and view all the answers

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