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  • Question

  • Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is


  • Options
  • A. added to the feed slurry.
  • B. precoated on the filter medium prior to filtration.
  • C. separated from the cake by dissolving solids or by burning it off.
  • D. all 'a', 'b'&'c'.

  • Correct Answer
  • all 'a', 'b'&'c'. 

    • Mechanical Operations problems

    Search Results

    • 1. Which of the following is the most suitable for handling fibrous and dense slurries?

    • Options
    • A. Propeller agitator
    • B. Cone type agitator
    • C. Turbine agitator
    • D. Radial propeller agitator
      • Discuss
    • 2. The capacity of a pneumatic conveying system depends upon the

    • Options
    • A. bulk density of materials.
    • B. pressure of the conveying air.
    • C. diameter of the conveying line.
    • D. all (a), (b) and (c).
      • Discuss
    • 3. 200 mesh screen means 200 openings per

    • Options
    • A. cm2
    • B. cm
    • C. inch
    • D. inch2
      • Discuss
    • 4. Ball mills and tube mills with flint or porcelain balls are used for size reduction of

    • Options
    • A. asbestos
    • B. rubber
    • C. non-metallic ores
    • D. limestone
      • Discuss
    • 5. Two particles are called to be equal settling, if they are having the same.

    • Options
    • A. size.
    • B. specific gravity.
    • C. terminal velocities in the same fluid & in the same field of force.
    • D. none of these.
      • Discuss
    • 6. Diatomaceous earth is a/an

    • Options
    • A. explosive
    • B. filter aid
    • C. filter medium
    • D. catalyst
      • Discuss
    • 7. Highly viscous liquids & pastes are agitated by

    • Options
    • A. propellers
    • B. turbine agitators
    • C. multiple blade paddles
    • D. none of these
      • Discuss
    • 8. The energy required per unit mass to grind limestone particles of very large size to 100 ?m is 12.7 kWh/ton. An estimate (using Bond's law) of the energy to grind the particles from a very large size to 50 ?rn is

    • Options
    • A. 6.35 kWh/ton
    • B. 9.0 kWh/ton
    • C. 18 kWh/ton
    • D. 25.4 kWh/ton
      • Discuss
    • 9. Jigging is a technique by which different particles can be

    • Options
    • A. separated by particle size.
    • B. separated by particle density.
    • C. separated by particle shape.
    • D. mixed.
      • Discuss
    • 10. Tabular bowl centrifuges as compared to disk bowl centrifuges

    • Options
    • A. operate at higher speed.
    • B. employ bowl of larger diameter.
    • C. can not be operated under pressure/vacuum.
    • D. can't be used for separation of fine suspended solids from a liquid.
      • Discuss

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