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Chemical Engineering :: Materials and Construction

  1. The range of Mho's scale of hardness is from

  2. A.
    l to l5
    B.
    l to 8
    C.
    l to10
    D.
    0 to 10

  3. Which of the following pairs of elements may form an alloy ?

  4. A.
    Iron & carbon
    B.
    Iron & mercury
    C.
    Platinum & mercury
    D.
    None of these

  5. SO3 is absorbed using H2SO4 in a

  6. A.
    cast iron packed tower.
    B.
    stainless steel plate tower.
    C.
    packed steel tower lined with acid proof bricks.
    D.
    none of these.

  7. Carbon percentage in medium carbon steel is around

  8. A.
    0.1 to 0.35
    B.
    0.35 to 0.5
    C.
    0.8 to 1.4
    D.
    1 to 1. 5

  9. The preferred material of construction for storage tanks for 98% sulphuric acid is

  10. A.
    aluminium
    B.
    lead
    C.
    stainless steel 316
    D.
    mild steel

  11. The fermentor used for the production of ethyl alcohol from molasses is made of

  12. A.
    wood
    B.
    concrete
    C.
    copper bearing steel
    D.
    procelain

  13. Super conductors are those substances, which

  14. A.
    offer no resistance to current flow.
    B.
    conduct electricity at low temperature.
    C.
    offer high resistance to current flow.
    D.
    conduct electricity at high temperature.

  15. Cermets are used for making

  16. A.
    cutting tools
    B.
    abrasives
    C.
    both (a) & (b)
    D.
    neither (a) nor (b)

  17. The formation of oxide film on a metal due to atmospheric exposure reduces its

  18. A.
    toughness
    B.
    stiffness
    C.
    creep limit
    D.
    all (a), (b) & (c)

  19. A hardened steel essentially contains

  20. A.
    sorbite
    B.
    troostite
    C.
    martensite
    D.
    none of these