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Chemical Engineering :: Chemical Process

  1. Use of hydrated lime in water treatment

  2. A.
    before filtration, reduces the bacterial load on filters.
    B.
    after filtration, combats the corrosive-ness of water due to the presence of O2 & CO2.
    C.
    is to adjust the pH value.
    D.
    all (a), (b) and (c).

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  3. Higher vicosity index of a lubricating oil denotes

  4. A.
    less changes in fluidity of oil with temperature.
    B.
    substantially high change in fluidity of oil with temperature.
    C.
    its unsuitability under varying temperature conditions .
    D.
    none of these.

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  5. Le-Blanc process is a primitive process for the manufacture of

  6. A.
    caustic soda
    B.
    soda ash
    C.
    bromine from sea water
    D.
    hydrochloric acid

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  7. How much temperature is maintained during quicklime manufacture in the calcination zone of the vertical shaft kiln?

  8. A.
    500°C
    B.
    750°C
    C.
    1000°C
    D.
    1500°C

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  9. Cement setting under water employs a/an __________ process.

  10. A.
    hydration
    B.
    decomposition
    C.
    oxidation
    D.
    reduction

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  11. __________ are added in lacquers to remove film brittleness and to improve adhereness.

  12. A.
    Film forming materials
    B.
    Plasticisers
    C.
    Diluents
    D.
    Solvents

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  13. Washing of coal is done to

  14. A.
    remove the inherent impurities.
    B.
    remove the adhering impurities.
    C.
    reduce the ash content.
    D.
    both(b) and (c).

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  15. Systemic insecticides

  16. A.
    are absorbed throughout the plant.
    B.
    kill insects following external bodily contact.
    C.
    are stomach poisons.
    D.
    emit poisonous vapour.

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  17. Dry ice (solidified CO2) is used for the

  18. A.
    storage & shipment of frozen foods and ice-creams.
    B.
    liquefaction of permanent gases.
    C.
    liquefaction of natural gas.
    D.
    none of these.

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  19. In nylon-66, the first and second numbers (i.e., 6) respectively designate the number of carbon atoms present in the

  20. A.
    diamine and the ring.
    B.
    dibasic acid and the ring.
    C.
    diamine and the dibasic acid.
    D.
    none of these.

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