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Home Chemical Engineering Petroleum Refinery Engineering Comments

  • Question
  • Which of the following is desirable in diesel and kerosene but is undersirable in gasoline?


  • Options
  • A. Aromatics
  • B. Mercaptans
  • C. Paraffins
  • D. Naphthenic acid

  • Correct Answer
  • Paraffins 


  • Petroleum Refinery Engineering problems


    Search Results


    • 1. Gum formation in stored gasoline is mainly due to the

    • Options
    • A. alkylation of unsaturates.
    • B. presence of sulphur.
    • C. oxidation & polymerisation of unsaturates.
    • D. higher aromatic content.
    • Discuss
    • 2. Octane number of gasoline produced by two stage fluidised catalytic cracking process is

    • Options
    • A. 80
    • B. 87
    • C. 92
    • D. 97
    • Discuss
    • 3. An upper limit of oil content is limited to about __________ percent for achieving efficient and satisfactory level of wax sweating.

    • Options
    • A. 5
    • B. 15
    • C. 40
    • D. 60
    • Discuss
    • 4. Refractive index of a petrofuel which is the ratio of velocity of light in air to its velocity in the petrofuel gives an indication if its

    • Options
    • A. molecular weight
    • B. aromatics content
    • C. both a & b
    • D. neither a nor b
    • Discuss
    • 5. During electrical desalting of crude oil, the electrical conductivity of a mixture of crude oil and water (which ranges between 3 to 8% water) __________ with increase in the amount of water.

    • Options
    • A. decreases
    • B. increases
    • C. remains unchanged
    • D. decreases linearly
    • Discuss
    • 6. Main boring diameter for petroleum well is 20-30 cms in diameter, while the depth of the oil well may be about __________ kms.

    • Options
    • A. 0.1 to 0.5
    • B. 1.5 to 4.5
    • C. 7.5 to 12.5
    • D. 15-20
    • Discuss
    • 7. Pick out the wrong statement.

    • Options
    • A. Iso-paraffin crack faster than n-paraf-fin.
    • B. Catalytic cracking is endothermic, but the regeneration of catalyst is exothermic.
    • C. Rate of decomposition of olefins in catalytic cracking is slightly slower than the thermal cracking.
    • D. None of these.
    • Discuss
    • 8. Pick out the wrong statement.

    • Options
    • A. Higher specific gravity of petroleum products means higher C/H ratio.
    • B. Aromatics have lower specific gravity than corresponding paraffins.
    • C. Hydrocarbons of low specific gravity (e.g, paraffins) possess the maximum thermal energy per unit volume.
    • D. Hydrocarbons of high specific gravity (eg, aromatics) possess the maximum thermal energy per unit weight.
    • Discuss
    • 9. Gasoline extracted from natural gas (by compression and cooling) is called the __________ gasoline.

    • Options
    • A. polymer
    • B. unleaded
    • C. casing head
    • D. straight run
    • Discuss
    • 10. 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


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