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Chemical Engineering :: Fertiliser Technology

  1. Prilling tower is found in the flowsheet for the manufacture of

  2. A.
    ammonia
    B.
    urea
    C.
    superphosphate
    D.
    triple superphosphate

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  3. Reaction of orthophosphoric acid with soda ash produces

  4. A.
    sodium tripolyphosphate (STPP)
    B.
    tricresyl phosphate
    C.
    tributyl phosphate
    D.
    nitrophosphate

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  5. Urea is formed only

  6. A.
    in liquid phase
    B.
    in vapour phase
    C.
    at very high temperature
    D.
    at very low pressure (vacuum)

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  7. Dehydration of ammonium carbamate (to produce urea) is a/an __________ reaction.

  8. A.
    reversible
    B.
    catalytic
    C.
    exothermic
    D.
    endothermic

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  9. Electric process as compared to wet process (for the manufacture of phosphoric acid)

  10. A.
    can use only high grade phosphate rock.
    B.
    is used less frequently.
    C.
    produces a valuable by-product called gypsum.
    D.
    is weak acid process.

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  11. Ammonium sulphate can be produced by reacting gypsum with

  12. A.
    ammonia
    B.
    ammonium carbonate
    C.
    nitric acid
    D.
    none of these

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  13. Nitrogenous fertiliser is required

  14. A.
    during the early stage of growth to promote development of stem and leaves.
    B.
    for accelerating fruit formation in later stage of growth.
    C.
    to lessen the effect of excessive potash application.
    D.
    none of these.

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  15. Fertiliser plant making ammonium sulphate employing gypsum-ammonia reaction (usual practice is to use ammonia and sulphuric acid) is located at

  16. A.
    Rourkela (under SAIL)
    B.
    Bokaro (under SAIL)
    C.
    Sindri (under FCI)
    D.
    Baroda (under G.S.F.C.)

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  17. Catalyst used in Haber's process for ammonia production is

  18. A.
    reduced iron oxide
    B.
    nickel
    C.
    vanadium pentoxide
    D.
    silica gel

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  19. Sodium tri poly phosphate (STPP) is manufactured by reaction of phosphoric acid with sodium

  20. A.
    carbonate
    B.
    phosphate
    C.
    bicarbonate
    D.
    silicate

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