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  • Question
  • The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by


  • Options
  • A. biological oxygen pond.
  • B. aerated lagoons.
  • C. trickling filters.
  • D. gravity separator having oil skimming devices.

  • Correct Answer
  • gravity separator having oil skimming devices. 


  • More questions

    • 1. °API gravity of water at N.T.P. is about

    • Options
    • A. 0
    • B. 1
    • C. 10
    • D. 100
    • Discuss
    • 2. Carbon Content by weight in air dried wood may be about __________ percent.

    • Options
    • A. 10
    • B. 25
    • C. 50
    • D. 80
    • Discuss
    • 3. Energy produced in the nuclear fission is of the order of __________ MeV.

    • Options
    • A. 20
    • B. 200
    • C. 1000
    • D. 2000
    • Discuss
    • 4.  for a Tee (used as elbow, entering run) would be around

    • Options
    • A. 5
    • B. 60
    • C. 200
    • D. 350
    • Discuss
    • 5. 200 mesh seive size corresponds to __________ microns.

    • Options
    • A. 24
    • B. 74
    • C. 154
    • D. 200
    • Discuss
    • 6. Polycaprolactum is also known as

    • Options
    • A. nylon-66
    • B. nylon-6
    • C. teflon
    • D. SBR
    • Discuss
    • 7. Carbon/hydrogen ratio (by weight) is maximum (out of following) for

    • Options
    • A. gasoline
    • B. kerosene
    • C. light gas oil
    • D. heavy fuel oil
    • Discuss
    • 8. Salt content in sea water is about __________ percent.

    • Options
    • A. 0.5
    • B. 1
    • C. 3.5
    • D. 10
    • Discuss
    • 9. Refractoriness/fusion points of 'superduty' refractories is __________ °C.

    • Options
    • A. 1520-1630
    • B. 1630-1670
    • C. > 1730
    • D. > 2000
    • Discuss
    • 10. Laminar flow of a Newtonion fluid ceases to exist, when the Reynolds number exceeds

    • Options
    • A. 4000
    • B. 2100
    • C. 1500
    • D. 3000
    • Discuss


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