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  • Question
  • Pick out the wrong statement about the smoking tendency of various hydrocarbon constituents of kerosene.


  • Options
  • A. Smoking tendency of hydrocarbons increases in the order : paraffins ? isoparaffins ? naphthenes ? aromatics.
  • B. Smoking tendency of paraffins increases with decrease in its molecular weight.
  • C. Smoking tendency of naphthenes decreases with its increasing molecular weight & also on addition of double bond.
  • D. Smoking tendency of aromatics decreases with increase in its molecular weight.

  • Correct Answer
  • Smoking tendency of paraffins increases with decrease in its molecular weight. 


  • Petroleum Refinery Engineering problems


    Search Results


    • 1. Which is the most undesirable component in kerosene?

    • Options
    • A. Aromatics
    • B. i-paraffins
    • C. n-paraffins
    • D. Naphthenes
    • Discuss
    • 2. Illuminating characteristics of kerosene is expressed by its

    • Options
    • A. smoke point
    • B. aniline point
    • C. luminosity number
    • D. aromatic content
    • Discuss
    • 3. Flash point of an oil gives an idea of the

    • Options
    • A. nature of boiling point diagram of the system.
    • B. amount of low boiling fraction present.
    • C. explosion hazards.
    • D. all (a), (b) and (c).
    • Discuss
    • 4. Which of the following fractions of a crude oil will have the maximum gravity API (i.e. °API)?

    • Options
    • A. Diesel
    • B. Gasoline
    • C. Atmospheric gas oil
    • D. Vacuum gas oil
    • Discuss
    • 5. The octane number of aviation gasoline may be

    • Options
    • A. 79
    • B. 87
    • C. 97
    • D. >100
    • Discuss
    • 6. Which of the following has the lowest viscosity (at a given temperature) of all?

    • Options
    • A. Naphtha
    • B. Kerosene
    • C. Diesel
    • D. Lube oil
    • Discuss
    • 7. The coking process normally mostly used in Indian oil refineries is the __________ coking process.

    • Options
    • A. delayed
    • B. flexi
    • C. fluid
    • D. contact
    • Discuss
    • 8. Tanks used for the storage of petroleum products (which are inflammable) should be painted with a __________ paint.

    • Options
    • A. black
    • B. white
    • C. red
    • D. yellow
    • Discuss
    • 9. Catalyst used in catalytic reforming is

    • Options
    • A. platinum on alumina
    • B. nickel
    • C. iron
    • D. aluminium chloride
    • Discuss
    • 10. __________ converts n-paraffins to i-paraffins.

    • Options
    • A. Alkylation
    • B. Polymerisation
    • C. Isomerisation
    • D. none of these
    • Discuss


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