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Chemical Engineering :: Materials and Construction

  1. High speed cutting tool steels contain about __________ percent of tungsten.

  2. A.
    6-8
    B.
    18-20
    C.
    30-35
    D.
    50-55

  3. The 'bomb' in the bomb calorimeter is made of

  4. A.
    molybdenum stainless steel
    B.
    mild steel
    C.
    high silicon iron (14% Si)
    D.
    copper

  5. Which of the following is produced by condensation polymerisation ?

  6. A.
    Bakelite
    B.
    Polythene
    C.
    Poly vinyl chloride
    D.
    Polystyrene

  7. The crystal structure of most of the common metals is

  8. A.
    orthorhombic
    B.
    cubic
    C.
    hexagonal
    D.
    none of these

  9. Telfon (PTFE) is corroded by

  10. A.
    hydrochloric acid (10%)
    B.
    hydrochloric acid (95%)
    C.
    sulphuric acid
    D.
    none of these

  11. Hastelloy C is a good material of construction in chemical process industry, since it is

  12. A.
    highly corrosion resistant and is readily fabricated.
    B.
    relatively inexpensive although it can be fabricated with some difficulty.
    C.
    corrosion resistant to most alkalis, particularly because of its copper content.
    D.
    light and resists attack by acids.

  13. Mixing vessel used for the chlorination of methane to produce methyl chloride is made of

  14. A.
    copper
    B.
    cast iron
    C.
    aluminium
    D.
    high carbon steel

  15. The loss of strength in compression which occurs, when there is a gain of strength in tension due to over loading is called

  16. A.
    Bauschinger effect.
    B.
    Hooke's effect.
    C.
    hysterisis.
    D.
    relaxation.

  17. Pick out the wrong statement.

  18. A.
    Pure rubber is as useless as pure gold as a material of construction.
    B.
    Thermal conductivity of aluminium is higher than that of copper; hence it is increasingly used for utensil making.
    C.
    Copper has poor weldability.
    D.
    Reinforced plastics are made from both thermoplastic as well as thermosetting plastics.

  19. The specific gravity of coal depends mainly on its __________ content.

  20. A.
    carbon
    B.
    volatile matter
    C.
    ash
    D.
    moisture