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Chemical Engineering :: Refractory Technology

Refractory Technology - Section 1
Refractory Technology - Section 2
Refractory Technology - Section 3
Refractory Technology - Section 4
Refractory Technology - Section 5

  1. Resistance to slag attack of a refractory

    2. A.
    depends on the nature of slag & refractory.
    B.
    decreases at higher temperature.
    C.
    decreases, if defective joints & cracks exist in the refractory.
    D.
    all (a), (b) and (c).

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  2. Grog

    3. A.
    contains both alumina and silica.
    B.
    iscrushed firebrick.
    C.
    is a non-plastic material.
    D.
    all (a), (b) and (c).

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  3. Test piece for determination of RUL of a refractory is heated in a/an

    4. A.
    oxidising atmosphere
    B.
    reducing atmosphere
    C.
    electric furnace
    D.
    neutral atmosphere

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  4. Magnesite refractories are used for the construction of those furnaces, which are

    5. A.
    not required to resist the corrosive action of basic slag.
    B.
    not subjected to fluctuation in temperature.
    C.
    used for raising & maintaining high temperature.
    D.
    both (b) and (c)

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  5. Roof of a basic electric furnace is made of __________ bricks.

    6. A.
    superduty fireclay
    B.
    silica
    C.
    chromite
    D.
    none of these

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  6. Capacity of a refractory brick to withstand-sudden changes in temperature is denoted by the property called

    7. A.
    spalling resistance.
    B.
    refractoriness.
    C.
    refractoriness under load (RUL).
    D.
    none of these.

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  7. Magnesite bricks are used in those parts of furnaces, which are

    8. A.
    subjected to temperature fluctuation.
    B.
    required to resist corrosive basic slag.
    C.
    subjected to high load.
    D.
    none of these.

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  8. Which is not a basic refractory ?

    9. A.
    Chrome magnesite
    B.
    Magnesite
    C.
    Dolomite
    D.
    Silicon carbide

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  9. Thoria

    10. A.
    has high fusion temperature (> 3000°C) but poor resistance to thermal shock.
    B.
    has high resistance to basic slags.
    C.
    which is expensive & radioactive, is used in crucibles for melting high purity metals.
    D.
    all (a), (b) and (c).

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  10. Which property of refractories is the most important for top section of the blast furnace?

    11. A.
    Resistance to abrasion.
    B.
    Resistance to slag peneration.
    C.
    Stability of volume at high temperature.
    D.
    Resistance to corrosion by slag.

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