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  • Question

  • BET apparatus


  • Options
  • A. measures the catalyst surface area directly.
  • B. operates at very high pressure.
  • C. is made entirely of stainless steel.
  • D. none of these.

  • Correct Answer
  • none of these. 

    • Chemical Reaction Engineering problems

    Search Results

    • 1. Pick out the wrong statement pertaining to space velocity of flow reactors.

    • Options
    • A. The unit of space velocity is (time)-1 .
    • B. The space velocity of 3 hr-1 means that three reactor volumes of feed at specified conditions are being fed into the reactor every hour.
    • C. The space velocity of 3 hr-1 means that one third reactor volume of feed at specified conditions are being fed into the reactor.
    • D. none of these.
      • Discuss
    • 2. Specific rate constant for a second order reaction

    • Options
    • A. is independent of temperature.
    • B. varies with temperature.
    • C. depends on the nature of the reactants.
    • D. both (b) and (c).
      • Discuss
    • 3. For high conversion in a highly exothermic solid catalysed reaction, use a __________ bed reactor.

    • Options
    • A. fixed
    • B. fluidised bed reactor followed by a fixed
    • C. fixed bed reactor followed by a fluidised
    • D. fluidised
      • Discuss
    • 4. For a reaction of the type, , the rate of reaction (- rx) is given by

    • Options
    • A. (K1+K1)CX
    • B. (K1+K2+K3)CX
    • C. K1CV - K2CX
    • D. (K1-K2)CX
      • Discuss
    • 5. Which of the following is the most suitable for very high pressure gas phase reaction?

    • Options
    • A. Batch reactor
    • B. Tubular flow reactor
    • C. Stirred tank reactor
    • D. Fluidised bed reactor
      • Discuss
    • 6. The most unsuitable reactor for carrying out reactions in which high reactant concentration favours high yields is

    • Options
    • A. backmix reactor
    • B. plug flow reactor
    • C. series of CSTR
    • D. PFR in series
      • Discuss
    • 7. Pick out the wrong statement.

    • Options
    • A. The vessel dispersion number (D/UL) for plug flow and mixed flow approaches zero and infinity respectively.
    • B. Space time in a flow reactor is a measure of its capacity and is equal to the residence time when the density of reaction mixture is constant.
    • C. Mixed reactor is always smaller than the plug flow reactor for all positive reaction orders for a particular duty.
    • D. In an ideal tubular flow reactor, mixing takes place in radial direction and there is no mixing in logitudinal direction.
      • Discuss
    • 8. Sulphuric acid is used as a catalyst in the

    • Options
    • A. hydrogenation of oils.
    • B. gas phase oxidation of SO2 in chamber process.
    • C. alkylation of hydrocarbons.
    • D. none of these.
      • Discuss
    • 9. A reactor is generally termed as an autoclave, when it is a

    • Options
    • A. high pressure batch reactor.
    • B. atmospheric pressure tank reactor.
    • C. high pressure tubular reactor.
    • D. atmospheric pressure CSTR.
      • Discuss
    • 10. Rate of a gaseous phase reaction is given by, . The unit of rate constant is

    • Options
    • A. (atm)-1
    • B. (hr)-1
    • C. (atm)-1.(hr)-1
    • D. atm.(hr)-1
      • Discuss

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