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  • Question

  • Separation of particles of various sizes, shapes and densities by allowing them to settle in a fluid is called


  • Options
  • A. classification
  • B. froth floatation
  • C. thickening
  • D. clarification

  • Correct Answer
  • classification 

    • Mechanical Operations problems

    Search Results

    • 1. To produce talcum powder, use

    • Options
    • A. ball mill
    • B. hammer mill
    • C. jet mill
    • D. pin mill
      • Discuss
    • 2. Wheat is ground into flour in a

    • Options
    • A. hammer crusher
    • B. roller crusher
    • C. impact mill
    • D. fluid energy mill
      • Discuss
    • 3. Which of the following minerals is not subjected to magnetic separation method?

    • Options
    • A. Rutile
    • B. Galena
    • C. Chromite
    • D. Siderite
      • Discuss
    • 4. The process opposite to 'dispersion' is termed as the

    • Options
    • A. flocculation
    • B. sedimentation
    • C. filtration
    • D. none of these.
      • Discuss
    • 5. Maximum size reduction in a fluid energy mill is achieved by

    • Options
    • A. compression
    • B. interparticle attrition
    • C. cutting
    • D. impact
      • Discuss
    • 6. In a size reduction crushing operation, feed size is 100 to 300 mm. while the product size is 10 to 50 mm. This is a case of the __________ crushing.

    • Options
    • A. primary
    • B. secondary
    • C. fine
    • D. ultrafine
      • Discuss
    • 7. Filtration should be stopped in a filter press, if the

    • Options
    • A. cake becomes very dense.
    • B. liquor stops flowing out to the discharge.
    • C. filtration pressure rises suddenly.
    • D. both(b)&(c).
      • Discuss
    • 8. A gravity decanter is meant for the separation of two __________ density.

    • Options
    • A. immiscible liquids of different
    • B. miscible liquids of different
    • C. immiscible liquids of same
    • D. miscible liquids of same
      • Discuss
    • 9. The specific surface of sherical particles is proportional to (where, Dp = diameter of particle).

    • Options
    • A. D2p
    • B. Dp
    • C. 1/Dp
    • D. 1/D2p
      • Discuss
    • 10. Pick out the correct statement.

    • Options
    • A. Angle of repose is always greater than the angle of slide.
    • B. A hopper is a small bin with a sloping bottom.
    • C. A silo is a short height vessel of very large diameter used for the storage of high volatile matter coal.
    • D. Pine oil is used as a 'modifying agent' (for activating or depressing the adsorption of filming agents) in froth floatation process.
      • Discuss

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