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  • Question
  • Vacuum maintained in the vacuum distillation tower of the crude distillation plant is about __________ mm Hg (absolute).


  • Options
  • A. 5-10
  • B. 30-80
  • C. 150-250
  • D. 350-400

  • Correct Answer
  • 30-80 


  • Petroleum Refinery Engineering problems


    Search Results


    • 1. Liquefied Petroleum Gas (LPG) in domestic use cylinders is in the liquid form. The density of LPG in liquid form is about __________ of that of water (i.e. 1 gm/c.c).

    • Options
    • A. one fourth
    • B. one third
    • C. half
    • D. one eighth
    • Discuss
    • 2. Which of the following fractions of petroleum contains maximum sulphur?

    • Options
    • A. Diesel
    • B. Gasoline
    • C. Naphtha
    • D. Atmospheric residue
    • Discuss
    • 3. Vacuum maintained in the vacuum distillation column in oil refinery is in the range of about __________ mm Hg absolute.

    • Options
    • A. 1 to 5
    • B. 30 to 80
    • C. 250 to 350
    • D. 450 to 500
    • Discuss
    • 4. Natural gas recovered along with crude oil from oil wells is called wet natural gas which has a higher __________ compared to the dry natural gas.

    • Options
    • A. unsaturated hydrocarbon content
    • B. calorific value
    • C. quantity of propane
    • D. quantity of butane
    • Discuss
    • 5. "Breathing loss" on storage of gasoline occurs due to the

    • Options
    • A. presence of unsaturated air.
    • B. fluctuation of ambient temperature during day and night.
    • C. both (a) and (b).
    • D. neither (a) nor (b).
    • Discuss
    • 6. Octane number (unleaded) of reformed gasoline may be upto

    • Options
    • A. 60
    • B. 70
    • C. 80
    • D. 90
    • Discuss
    • 7. Lane and Garton classification of petroleum is based on its

    • Options
    • A. composition
    • B. specific gravity
    • C. optical properties
    • D. viscosity
    • Discuss
    • 8. Which of the followingis desirable in petrol (gasoline) but undesirable in kerosene?

    • Options
    • A. Paraffins
    • B. Aromatics
    • C. Mercaptans
    • D. Naphthenic acid
    • Discuss
    • 9. Which parameter is used for the grading of paraffin waxes?

    • Options
    • A. Specific gravity
    • B. Melting point
    • C. Viscosity
    • D. Penetration number
    • Discuss
    • 10. Higher boiling fractions like atmospheric residue is distilled under vacuum at low temperature because at high temperature, there is a tendency of the predominance of

    • Options
    • A. thermal cracking
    • B. gum formation
    • C. coking
    • D. discoloration
    • Discuss


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