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Chemical Engineering :: Environmental Engineering

  1. Scale formation in boiler is controlled by

  2. A.
    preheating of feed water.
    B.
    reduction in hardness, silica & alumina in feed water.
    C.
    keeping the pH value of feed water just below 7.
    D.
    eliminating H2S in feed water.

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  3. Noise level heard at a distance of about 100 metres from a jet engine with after burner is about __________ decibels.

  4. A.
    120
    B.
    140
    C.
    170
    D.
    200

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  5. TLV of mercury in potable (drinking) water is about __________ ppm.

  6. A.
    0.001
    B.
    0.1
    C.
    1
    D.
    5

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  7. Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre)?

  8. A.
    Lagooning
    B.
    Activated carbon adsorption
    C.
    Biological oxidation pond
    D.
    Chemical coagulation

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  9. Which is a secondary air pollutant ?

  10. A.
    Photochemical smog
    B.
    Sulphur dioxide
    C.
    Nitrogen dioxide
    D.
    Dust particles

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  11. Which of the following is the most detrimental for water used in high pressure boiler ?

  12. A.
    Silica
    B.
    Turbidity
    C.
    Phenol
    D.
    Dissolved oxygen

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  13. Turbidity of water is an indication of the presence of

  14. A.
    suspended inorganic matter
    B.
    dissolved solids
    C.
    floating solids
    D.
    dissolved gases

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  15. Presence of excess flourine in water causes

  16. A.
    dental cavity
    B.
    tooth decay
    C.
    fluorosis
    D.
    respiratory disease

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  17. Siderosis is a disease caused by the inhalation of __________ dust.

  18. A.
    coal
    B.
    silica
    C.
    iron
    D.
    none of these

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  19. Which of the following pollutants is not emitted during volcanic eruptions ?

  20. A.
    SO2
    B.
    H2S
    C.
    CO
    D.
    hydrocarbons

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