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  • Question

  • In case of grinding in a ball mill


  • Options
  • A. wet grinding achieves a finer product size than dry grinding.
  • B. its capacity decreases with increasing fineness of the products.
  • C. grinding cost and power requirement increases with increasing fineness of the products.
  • D. all (a), (b) and (c).

  • Correct Answer
  • all (a), (b) and (c). 

    • Mechanical Operations problems

    Search Results

    • 1. Screw conveyors are

    • Options
    • A. run at very high rpm.
    • B. suitable for sticky materials.
    • C. suitable for highly abrasive materials.
    • D. all (a), (b) and (c)
      • Discuss
    • 2. Colloidal mills are used for __________ grinding.

    • Options
    • A. coarse
    • B. intermediate
    • C. fine
    • D. ultrafine
      • Discuss
    • 3. Energy requirement (per unit mass of material crushed/ground) is highest for

    • Options
    • A. jaw crusher
    • B. rod mill
    • C. ball mill
    • D. fluid energy mill
      • Discuss
    • 4. To remove very small amount of tiny solid impurities from liquid, we use a

    • Options
    • A. pressure filter
    • B. vacuum filter
    • C. centrifugal filter
    • D. coagulant
      • Discuss
    • 5. The maximum slope of a belt conveyor can be

    • Options
    • A. 15°
    • B. 30°
    • C. 45°
    • D. 60°
      • Discuss
    • 6. Hot, lumpy & abrasive materials are best transported by using a/an __________ conveyor.

    • Options
    • A. apron
    • B. belt
    • C. screw
    • D. flight
      • Discuss
    • 7. Cartridge filters are termed as 'edge' filters, because of the fact that the

    • Options
    • A. disks have very sharp edge.
    • B. solids are not deposited at the edge of the disk.
    • C. bulk of the solids are removed at the periphery of the disks.
    • D. none of these.
      • Discuss
    • 8. Fick's law relates to

    • Options
    • A. energy consumption
    • B. final particle size
    • C. feed size
    • D. none of these
      • Discuss
    • 9. The basic filtration equation is given as where, V is volume of the filtrate ; A is the filtration area, a is specific cake resistance, ? is viscosity of the filtrate, and C is the concentration of the solids in the feed slurry.
      In a 20 minutes constant rate filtration, 5 m3 of filtrate was obtained. If this is followed by a constant pressure filtration, how much more time in minutes, it will take for another 5 m3 of filtrate to be produced? Neglect filter medium resistance, Rm ; assume incompressible cake.

    • Options
    • A. 10
    • B. 20
    • C. 25
    • D. 30
      • Discuss
    • 10. Fluid medium used in the classification technique of mineral beneficiation is

    • Options
    • A. air
    • B. water
    • C. either (a) or (b)
    • D. neither (a) nor (b)
      • Discuss

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