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  • Question

  • The basic filtration equation is given as The basic filtration equation is given as where, V is volume of the filtrate ; A is the filtration a 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

  • Correct Answer
  • 20 

    • Tags: Bank Exams

    Mechanical Operations problems

    Search Results

    • 1. Fick's law relates to

    • Options
    • A. energy consumption
    • B. final particle size
    • C. feed size
    • D. none of these
      • Discuss
    • 2. 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
    • 3. Hot, lumpy & abrasive materials are best transported by using a/an __________ conveyor.

    • Options
    • A. apron
    • B. belt
    • C. screw
    • D. flight
      • Discuss
    • 4. 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
    • 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. 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
    • 7. Which of the following can be most effectively used for clarification of lube oil and printing ink?

    • Options
    • A. Sparkler filter
    • B. Precoat filter
    • C. Disc-bowl centrifuge
    • D. Sharpies supercentrifuge
      • Discuss
    • 8. Weber number is significant and is concerned with the

    • Options
    • A. solid-liquid mixing.
    • B. liquid-liquid mixing.
    • C. dispersion of liquid in liquid.
    • D. suspension of solid in liquid.
      • Discuss
    • 9. Additives used for promoting the floccula-tion of particles is a/an

    • Options
    • A. electrolyte
    • B. surface active agent
    • C. both (a) & (b)
    • D. neither (a) nor (b)
      • Discuss
    • 10. The capacity of a classifier in 'tons of solid/hr' is given by (where, A = cross-sectional area, m2 V = rising velocity of fluid, m/sec.S = percentage of solids in the suspension by volume.? = density of solids, kg/m3)

    • Options
    • A. 3.6 AVS.?
    • B. 3.6 A.V.?
    • C. 3.6 A.S. ?
    • D. 3.6 AVS/?
      • Discuss

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