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Chemical Engineering :: Environmental Engineering

  1. Smog is

  2. A.
    nothing but black smoke.
    B.
    a combination of smoke and fog.
    C.
    a liquid particle resulting from vapor condensation.
    D.
    a solid particle e.g. flyash.

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  3. __________ is the process of killing organism in water.

  4. A.
    Coagulation
    B.
    Sterilisation
    C.
    Disinfection
    D.
    Sedimentation

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  5. Reingleman chart No. 2 corresponds to __________ percent black smoke.

  6. A.
    10
    B.
    20
    C.
    40
    D.
    80

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  7. Which of the following is a manmade source of air pollution ?

  8. A.
    Automobile exhaust.
    B.
    Forest fire.
    C.
    Bacterial action in soil and swamp areas
    D.
    All (a), (b) and (c).

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  9. Which is the most efficient dust removal equipment for removal of sub-micronic dust particles from blast furnace gas ?

  10. A.
    Packed scrubber
    B.
    Gravity settling chamber
    C.
    Electrostatic precipitator
    D.
    Hydrocyclone

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  11. Insufficient washing of sand grains in a rapid sand filter causes

  12. A.
    air binding
    B.
    shrinkage of filtering media
    C.
    mud balls
    D.
    expansion of filtering media

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  13. Which of the following sources is responsible for maximum air pollution ?

  14. A.
    Industrial chimney exhaust.
    B.
    Forest fire.
    C.
    Automobiles exhaust.
    D.
    Photochemical oxidation of organic matter.

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  15. Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream ?

  16. A.
    Sedimentation tank
    B.
    Circular clarifier
    C.
    Mechanical flocculation
    D.
    Chemical coagulation

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  17. In sewage treatment, its sedimentation is speeded up by commonly adding

  18. A.
    hydrochloric acid.
    B.
    lime.
    C.
    copper sulphate.
    D.
    sodium sulphate.

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  19. Noise level in a quiet private business office is about __________ decibels.

  20. A.
    25
    B.
    50
    C.
    70
    D.
    85

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