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Chemical Engineering :: Chemical Process

  1. Carboxymethyl cellulose (CMC) is added in detergents to

  2. A.

     Prevent redeposition of soil on cleaned surface

    B.

     Act as optical brightening agent

    C.

     Inhibit corrosion in washing machines made of aluminium

    D.

     None of these

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  3. Which of the following is used as a coagulant in water treatment?

  4. A.

     Chloramine

    B.

     Chlorine

    C.

     Ferrous sulphate

    D.

     Hydrogen peroxide

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  5. Coal tar is used as a

  6. A.

     Binding material for coal briquettes

    B.

     Fuel in rotary kiln

    C.

     Binder in making carbon electrodes

    D.

     All of the above

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  7. The process involved in converting rubber into a thin sheet or coating it on fabric is called

  8. A.

     Extrusion

    B.

     Mastication

    C.

     Calendering

    D.

     Valcanisation

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  9. Raw material used in alcohol distilleries in India is

  10. A.

     Molasses

    B.

     Benzol

    C.

     Methylated spirit

    D.

     None of these

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  11. Fermentation of molasses to produce ethyl alcohol is done at __________ °C

  12. A.

     20 - 30

    B.

     < - 5

    C.

     100 - 150

    D.

     250 - 300

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  13. The end bleaching agent used to move last traces of colour bodies from the pulp is

  14. A.

     Chlorine dioxide (ClO₂)

    B.

     MgO

    C.

     SO₂ gas

    D.

     Mercaptans

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  15. Styrene-butadiene-rubber (SBR) as compared to natural rubber has

  16. A.

     Poorer tensile strength

    B.

     Poorer resistance to oxidation

    C.

     Greater amount of heat build-up under heavy loading

    D.

     All of the above

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  17. Which of the following is an additional step in the manufacture of paper from bagasse as compared to that from bamboo?

  18. A.

     Depithing

    B.

     Digestion

    C.

     Bleaching

    D.

     None of these

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  19. Black liquor is converted into white liquor by

  20. A.

     Evaporation and burning the concentrate followed by causticisation of products

    B.

     Multi-effect evaporation only

    C.

     Selective liquid extraction

    D.

     Extractive distillation

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