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Chemical Engineering :: Environmental Engineering

  1. In the context of the chemical process industries, the term BOD is normally associated with the

  2. A.
    characterisation of solid wastes.
    B.
    organic concentration in gaseous effluents.
    C.
    characterisation of liquid effluents.
    D.
    characterisation of boiler feed water.

  3. Noise emitted by a ventilation fan at a distance of 3 metres is about __________ decibels.

  4. A.
    85
    B.
    105
    C.
    125
    D.
    145

  5. Inhalation of silica dust causes a disease called

  6. A.
    bronchitis
    B.
    silicosis
    C.
    pneumoconiosis
    D.
    none of these

  7. Solid content in most of the domestic sewage is about __________ percent.

  8. A.
    0.001
    B.
    0.1
    C.
    5
    D.
    10

  9. In troposphere (the weather domain), the temperature 't' at height 'h' above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)

  10. A.
    t = 15 - 0.0065h
    B.
    t = 15 + 0.0065h
    C.
    t = 0.0035h -15
    D.
    t = 15 - 0.0035h

  11. High noise level in a chemical plant can be controlled by the

  12. A.
    suppression of noise at the source itself.
    B.
    path control of noise.
    C.
    protection of operating personnel.
    D.
    all (a), (b) & (c).

  13. Limestone powder is injected during pulverised coal burning in boilers to __________ the flue gases.

  14. A.
    reduce SO2 content in
    B.
    catalytically convert SO2 to SO3 in
    C.
    increase the dew point of
    D.
    none of these.

  15. Main pollutants released from petroleum refineries is

  16. A.
    CO, SO2 & H2S.
    B.
    CO2, NO & SO3.
    C.
    CO2, H2S & NO2.
    D.
    SO3, NO2 & CO2.

  17. Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is __________ decibels.

  18. A.
    35
    B.
    75
    C.
    95
    D.
    105

  19. Which of the following is a green house gas other than CO2 ?

  20. A.
    Methane
    B.
    Nitrous oxide
    C.
    Chlorofluro carbons (CFC)
    D.
    All (a), (b) and (c)