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  • Question

  • Waxes present in petroleum products


  • Options
  • A. can be separated out by distillation.
  • B. are not soluble in them.
  • C. crystallise out at low temperature.
  • D. decrease their viscosity.

  • Correct Answer
  • crystallise out at low temperature. 

    • Petroleum Refinery Engineering problems

    Search Results

    • 1. Feed for reforming is generally

    • Options
    • A. naphtha or straight run gasoline.
    • B. reduced crude.
    • C. vacuum gas oil.
    • D. atmospheric gas oil.
      • Discuss
    • 2. Cracking is

    • Options
    • A. an exothermic reaction.
    • B. an endothermic reaction.
    • C. favoured at very low temperature.
    • D. none of these.
      • Discuss
    • 3. Which of the following is not an important property of fuel oil/furnace oil?

    • Options
    • A. Sulphur content
    • B. Viscosity
    • C. Aniline point
    • D. Flash point
      • Discuss
    • 4. A fuel oil consists of 4 fractions A, B, C and D. Their molar compositions and vapour pressures are given below :

      The vapour pressure of the fuel oil will be __________ mm Hg.

    • Options
    • A. 736
    • B. 727.5
    • C. 512
    • D. 767.8
      • Discuss
    • 5. Which of the following is a non-regenerative fixed bed catalytic reforming process?

    • Options
    • A. Hydroforming
    • B. Thermofer catalytic reforming
    • C. Platforming
    • D. Hyperforming
      • Discuss
    • 6. Paraffins are desirable in lubricating oil, as it has got high

    • Options
    • A. viscosity
    • B. viscosity index
    • C. smoke point
    • D. pour point
      • Discuss
    • 7. With increase in the molecular weight of aromatic present in kerosene, its smoking tendency

    • Options
    • A. increases
    • B. decreases
    • C. remains same
    • D. is unpredictable
      • Discuss
    • 8. Water separometer index (modified) (WSIM) of a petrofuel is the measure of its

    • Options
    • A. emulsification tendency.
    • B. water separation characteristics.
    • C. water content.
    • D. water absorbing capacity from atmosphere.
      • Discuss
    • 9. Good quality kerosene should have

    • Options
    • A. low smoke point.
    • B. high smoke point.
    • C. high aromatics content.
    • D. low paraffins content.
      • Discuss
    • 10. Which of the following has the lowest cetane number?

    • Options
    • A. Aromatics
    • B. i-paraffins
    • C. Naphthene
    • D. Olefins
    • E. n-paraffins
      • Discuss

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