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Home ‣ Chemical Engineering ‣ Mass Transfer See What Others Are Saying!
  • Question

  • Which of the following is the most suitable for extraction in a system having very low density difference?


  • Options
  • A. Mixer-settler extractor
  • B. Centrifugal extractor
  • C. Pulsed extractor
  • D. Packed extraction tower

  • Correct Answer
  • Centrifugal extractor 

    • More questions

    • 1. 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
    • 2. Constituents of stellite are

    • Options
    • A. zinc, copper and nickel.
    • B. cobalt, chromium and tungsten.
    • C. zinc, aluminium and nickel.
    • D. nickel, cobalt and vanadium.
      • Discuss
    • 3. rpm of a trommel at critical speed is given by (where, D = Diameter of trommel in ft)

    • Options
    • A.
    • B.
    • C.
    • D. 76.75 D
      • Discuss
    • 4. 'P' is the investment made on an equipment, 'S' is its salvage value and 'n is the life of the equipment in years. The depreciation for rath year by the sum-of years digit method will be

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 5. In a reversible chemical reaction (where, ?x = number of moles of products-number of moles of reactants )

    • Options
    • A. addition of inert gas favours the forward reaction, when ?x is positive.
    • B. pressure has no effect on equilibrium, when ?n = 0.
    • C. addition of inert gas has no effect on the equilibrium constant at constant volume for any value of ?x (+ ve, - ve) or zero).
    • D. all 'a', 'b' & 'c'.
      • Discuss
    • 6. To increase the absorption factor, (where, G = gas flow rate, S = solvent flow rate)

    • Options
    • A. increase both 'G' and 'S'.
    • B. decrease both 'G' and 'S'.
    • C. increase 'S' and decrease 'G'.
    • D. increase 'G' and decrease 'S'
      • Discuss
    • 7. Cost incurred towards __________ in a chemical plant is a component of the utilities cost.

    • Options
    • A. water supply
    • B. running a control laboratory
    • C. property protection
    • D. medical services
      • Discuss
    • 8. __________ are produced by reacting polybasic acid (e.g. phthalic anhydride) with polyhydric alcohol (e.g., glycerol).

    • Options
    • A. Unsaturated polyester
    • B. Alkyd resins
    • C. Saturated polyester
    • D. Amino resins
      • Discuss
    • 9. Commercial power generation from fusion reactor is not yet possible, because

    • Options
    • A. it is difficult to control fusion reaction.
    • B. the fuel required (e.g. deuterium and tritium) is scarce.
    • C. it is difficult to initiate fusion reaction.
    • D. quantity of fuel required for initiating fusion reaction is prohibitively high.
      • Discuss
    • 10. __________ method for profitability evaluation of a project does not account for investment cost due to land.

    • Options
    • A. Net present worth
    • B. Pay out period
    • C. Discounted cash flow
    • D. Rate of return on investment
      • Discuss

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