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Chemical Engineering :: Materials and Construction

  1. Carbon is present in steel wholly in the

  2. A.
    combined form.
    B.
    free state as graphite.
    C.
    both (a) and (b).
    D.
    neither (a) nor (b).

  3. Carbon supply in pack carburising process is in the form of

  4. A.
    charcoal
    B.
    calcium carbide
    C.
    hydrocarbon oil
    D.
    graphite

  5. In SO3 absorber (Contact Process), packing material used is of

  6. A.
    cast iron
    B.
    chemical stoneware
    C.
    karbate
    D.
    mild steel

  7. Presence of manganese in alloy steel improves its

  8. A.
    corrosion resistance.
    B.
    cutting ability.
    C.
    abrasion resistance & toughness.
    D.
    elasticity & creep resistance.

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

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

  11. A material is called 'ductile', if it can be

  12. A.
    drawn into wires.
    B.
    hammered to a thin sheet.
    C.
    fractured without deformation.
    D.
    made lustrous by heating it.

  13. A chemical change takes place when iron

  14. A.
    rusts
    B.
    melts
    C.
    is heated
    D.
    none of these

  15. Evaporator used for concentrating tomato juice is made of

  16. A.
    nickel
    B.
    brass
    C.
    stainless steel-glass lined
    D.
    cast iron-rubber lined

  17. High carbon steel contains more than __________ percent carbon.

  18. A.
    0.5
    B.
    2.2
    C.
    2.5
    D.
    2.8

  19. The main constituent of carborundum is __________ carbide.

  20. A.
    calcium
    B.
    silicon
    C.
    boron
    D.
    aluminium