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  • Question

  • Oil and grease present in an emulsified state in waste water discharged from industries can be removed by


  • Options
  • A. biological oxidation.
  • B. skimming off.
  • C. settling out using chemical reagents.
  • D. chlorination.

  • Correct Answer
  • settling out using chemical reagents. 

    • Environmental Engineering problems

    Search Results

    • 1. Methyl iso-cynate (MIC) gas (TLV <1 ppm), which caused Bhopal gas tragedy in 1984 falls under the category of __________ toxic gas.

    • Options
    • A. moderately
    • B. highly
    • C. extremely
    • D. very extremely
      • Discuss
    • 2. Most efficient and suitable dust removal equipment for removal of flyash from flue gas in a thermal power plant is the

    • Options
    • A. gravity settling chamber
    • B. cyclone separator
    • C. electrostatic precipitator
    • D. bag filter
      • Discuss
    • 3. Presence of __________ hardness is responsible for the temporary hardness in water.

    • Options
    • A. carbonate
    • B. calcium
    • C. choride
    • D. sulphate
      • Discuss
    • 4. Foul odour and bad taste of water is removed by treating with

    • Options
    • A. alum
    • B. bleaching powder
    • C. activated carbon
    • D. copper sulphate.
      • Discuss
    • 5. Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels.

    • Options
    • A. 90
    • B. 120
    • C. 150
    • D. 180
      • Discuss
    • 6. Presence of soluble organics in polluted water causes

    • Options
    • A. undesirable plants growth.
    • B. depletion of oxygen.
    • C. fire hazards.
    • D. explosion hazards.
      • Discuss
    • 7. Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan

    • Options
    • A. with greater number of blades.
    • B. of increased diameter.
    • C. both (a) & (b).
    • D. neither (a) nor (b).
      • Discuss
    • 8. Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly __________ substances.

    • Options
    • A. radioactive
    • B. organic
    • C. inorganic
    • D. none of these
      • Discuss
    • 9. Foaming and priming in boiler operation can be reduced by reduction in __________ in feed water.

    • Options
    • A. turbidity
    • B. color (Hazen)
    • C. total solids
    • D. all (a), (b) & (c)
      • Discuss
    • 10. COD of raw municipal sewage may be in the range of about __________ mg/litre.

    • Options
    • A. 1-2
    • B. 5-10
    • C. 90-120
    • D. 1500-2500
      • Discuss

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