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Mechanical Operations problems

  • 1. The maximum slope of a belt conveyor can be

  • Options
  • A. 15°
  • B. 30°
  • C. 45°
  • D. 60°
    • Discuss
  • 2. 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
  • 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. Colloidal mills are used for __________ grinding.

  • Options
  • A. coarse
  • B. intermediate
  • C. fine
  • D. ultrafine
    • Discuss
  • 5. 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
  • 6. 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).
    • Discuss
  • 7. Hot, lumpy & abrasive materials are best transported by using a/an __________ conveyor.

  • Options
  • A. apron
  • B. belt
  • C. screw
  • D. flight
    • Discuss
  • 8. 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
  • 9. Fick's law relates to

  • Options
  • A. energy consumption
  • B. final particle size
  • C. feed size
  • D. none of these
    • Discuss
  • 10. The basic filtration equation is given as Chemical Engineering Mechanical Operations: 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
    • Also asked in: Bank Exams

    • Discuss

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