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  • Question
  • 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.

  • Correct Answer
  • minimise the gum formation. 


  • Petroleum Refinery Engineering problems


    Search Results


    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. 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.
    • Discuss
    • 6. The average boiling point of aviation turbine fuel is closest to that of

    • Options
    • A. lubricating oils
    • B. LPG
    • C. diesel
    • D. Kerosene
    • Discuss
    • 7. Choose the correct statement regarding thermal cracking.

    • Options
    • A. Moderate changes in operating temperature does not change the depth of cracking.
    • B. Increased residence time results in the decreased severity of cracking.
    • C. At low pressure, the yield of lighter hydrocarbons are more.
    • D. Greater depth of cracking gives lower octane number gasoline.
    • Discuss
    • 8. Presence of aromatics in

    • Options
    • A. diesel increases its cetane number.
    • B. kerosene increases its smoke point.
    • C. petrol increases its octane number.
    • D. all (a), (b) and (c).
    • Discuss
    • 9. Which is almost absent in crude petroleum?

    • Options
    • A. Olefins
    • B. Mercaptans
    • C. Naphthenes
    • D. Cycloparaffins
    • Discuss
    • 10. The pressure (kg/cm2 ) and temperature (°C) maintained in electrical desalters for crude oil are respectively

    • Options
    • A. 10 and 120
    • B. 1 and 200
    • C. 50 and 250
    • D. 10 and 300
    • Discuss


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