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Chemical Engineering :: Materials and Construction

  1. Graphite is corroded by

  2. A.
    sulphuric acid (10%)
    B.
    sea water
    C.
    hydrochloric acid
    D.
    none of these

  3. Carbon is present in the uncombined (graphitic) form in case of

  4. A.
    cast iron
    B.
    steel
    C.
    ferroalloy
    D.
    none of these

  5. Among the tin containing alloys, __________ consumes the maximum amount of tin.

  6. A.
    solder
    B.
    white metal
    C.
    pewter matal
    D.
    bronzes

  7. The hardest material just prior to diamond in Mhos scale is

  8. A.
    topax
    B.
    carborundum
    C.
    corrundum
    D.
    calcite

  9. The damage/deterioration of metals by the __________ action of fluids is called 'erosion'.

  10. A.
    abrasive
    B.
    corrosive
    C.
    both (a) & (b)
    D.
    neither (a) nor (b)

  11. Cast iron compared to steel is better in

  12. A.
    ductility
    B.
    fluidity & castability
    C.
    strength
    D.
    malleability

  13. Plasticisers are added to polymers to improve their

  14. A.
    tensile strength.
    B.
    softness & flexibility.
    C.
    acid resistance.
    D.
    alkali resistance.

  15. Polymerisation reactor used in the production of styrene butadiene rubber (SBR) is made of

  16. A.
    stainless steel or glass lined steel
    B.
    nickel clad steel
    C.
    high silicon cast iron
    D.
    aluminium

  17. Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with

  18. A.
    acidic refractory
    B.
    rubber
    C.
    karbate
    D.
    lead or acid proof bricks

  19. The softest material in Mho's scale (for measuring hardness) is

  20. A.
    talc
    B.
    gypsum
    C.
    rubber
    D.
    none of these