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  • Question

  • Though increased pressure has a retarding effect on cracking reaction, yet in actual process, a positive pressure of 10-15 kgf/cm2 is maintained during cracking mainly to


  • Options
  • A. increase the yield of light distillates.
  • B. suppress coke formation.
  • C. enhance the octane number of gasoline.
  • D. reduce gum content in gasoline.

  • Correct Answer
  • suppress coke formation. 

    • Petroleum Refinery Engineering problems

    Search Results

    • 1. Straight run naphtha is converted into high octane number petrol (gasoline) by catalytic

    • Options
    • A. cracking
    • B. polymerisation
    • C. reforming
    • D. isomerisation
      • Discuss
    • 2. Molecular weight of crude petroleum may be around

    • Options
    • A. 50
    • B. 250
    • C. 1500
    • D. 5000
      • Discuss
    • 3. Which of the following categories of gasoline has the highest lead susceptibility?

    • Options
    • A. Straight run gasoline
    • B. Platinum reformed gasoline
    • C. Catalytical cracked gasoline
    • D. Polymer gasoline
      • Discuss
    • 4. Solvent used for dewaxing of petroleum products are

    • Options
    • A. furfural
    • B. methyl ethyl ketone (MEK)
    • C. propane
    • D. both(b)&(c)
      • Discuss
    • 5. Olefins are

    • Options
    • A. saturated hydrocarbons.
    • B. unsaturated cyclic compounds (hydrocarbons).
    • C. present in substantially good quantity in crude petroleum.
    • D. none of these.
      • Discuss
    • 6. A typical yield of diesel in straight run distillation of crude oil may be about __________ percent.

    • Options
    • A. 8
    • B. 18
    • C. 28
    • D. 35
      • Discuss
    • 7. Which one is used to determine the colour of petroleum products?

    • Options
    • A. Colour comparator
    • B. Saybolt chromometer
    • C. Cleveland apparatus
    • D. None of these
      • Discuss
    • 8. Catalytic cracking compared to thermal cracking of residue of vacuum distillation of crude oil

    • Options
    • A. gives higher yield of petrol.
    • B. lower octane number of petrol.
    • C. higher sulphur content in the product.
    • D. higher gum forming material in petrol.
      • Discuss
    • 9. The proper arrangement of the petroleum fractions in order of their boiling points is

    • Options
    • A. lubricating oil > diesel > petrol > LPG
    • B. lubricating oil > petrol > diesel > LPG
    • C. petrol > lubricating oil > diesel > LPG
    • D. petrol > diesel > LPG > lubricating oil
      • Discuss
    • 10. Antioxidants are added in petrol to

    • Options
    • A. impart colour to it, for easy identification.
    • B. minimise the gum formation.
    • C. prevent icing of the carburettor.
    • D. prevent the lead build up in engines.
      • Discuss

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