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  • Question
  • Which of the following is an additive used for improving the cetane number of diesel?


  • Options
  • A. Tetraethyl lead
  • B. Tetramethyllead
  • C. Ethyl nitrate or acetone
  • D. None of these

  • Correct Answer
  • Tetraethyl lead 


  • Petroleum Refinery Engineering problems


    Search Results


    • 1. Hydrocracking employs

    • Options
    • A. high pressure & temperature.
    • B. low pressure & temperature.
    • C. high pressure and low temperature.
    • D. high temperature and low pressure.
    • Discuss
    • 2. Pick out the correct statement pertaining to catalytic cracking.

    • Options
    • A. With increase in the reactor pressure, octane number of gasoline decreases.
    • B. With increase in the reactor temperature, gasoline yield decreases for a given conversion.
    • C. Percentage conversion increases with increase in the catalyst to oil ratio.
    • D. all (a), (b) and (c).
    • Discuss
    • 3. Sour crude means the __________ bearing crude.

    • Options
    • A. asphalt
    • B. sulphur compounds
    • C. wax
    • D. nitrogen compounds
    • Discuss
    • 4. LPG when brought to atmospheric pressure & temperature will be a

    • Options
    • A. liquid lighter than water.
    • B. liquid heavier than water.
    • C. gas lighter than air.
    • D. gas heavier than air.
    • Discuss
    • 5. Cetane number of alpha methyl naphthalene is assumed to be

    • Options
    • A. 0
    • B. 100
    • C. 50
    • D. ?
    • Discuss
    • 6. The general formula of naphthenes is

    • Options
    • A. CnH2n + 2
    • B. CnH2n-6 (where, n ? 6)
    • C. CnHn-4
    • D. same as that for olefins i.e. CnH2n
    • Discuss
    • 7. The main purpose of recycling the byproduct hydrogen gas in the reformer reactor is to

    • Options
    • A. obviate catalyst poisoning.
    • B. maintain the reaction temperature.
    • C. sustain the reactor pressure.
    • D. hydrogenate the feed stock.
    • Discuss
    • 8. Increase in the specific gravity of petroleum products indicates

    • Options
    • A. decrease in paraffin content.
    • B. increase in thermal energy per unit weight.
    • C. increase in aromatic content.
    • D. higher H/C ratio.
    • Discuss
    • 9. Crude topping column operates at __________ pressure.

    • Options
    • A. atmospheric
    • B. 10 atm
    • C. vacuum
    • D. 3 atm.
    • Discuss
    • 10. Petroleum liquid fuels having flash point greater than 66°C is considered as safe during storage and handling. Which of the following has flash point > 66°C?

    • Options
    • A. Naphtha
    • B. Petrol
    • C. Kerosene
    • D. Heavy fuel oil
    • Discuss


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