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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. The linear thermal expansion of __________ bricks upto 1000 °C is very low of the order of ≤ 0.5 percent.

    2. A.
    fireclay
    B.
    silica
    C.
    magnesite
    D.
    corundum

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  2. Fusion point of an acidic refractory material is

    3. A.
    increased by the addition of basic oxides.
    B.
    reduced by the addition of basic oxides.
    C.
    not affected by the addition of basic oxides.
    D.
    always more than 2500°C.

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  3. Which is required in an insulating refractory ?

    4. A.
    High thermal conductivity
    B.
    Low porosity
    C.
    Both (a) and (b)
    D.
    Neither (a) nor (b)

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  4. 'Super refractories' are made from pure

    5. A.
    carbides
    B.
    oxides
    C.
    borides
    D.
    nitrides

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  5. Chromite refractories are

    6. A.
    acidic refractory.
    B.
    neutral refractory.
    C.
    basic refractory.
    D.
    fired at a temperature of 600°C only.

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  6. Which is the most stable crystalline form of silica at room temperature ?

    7. A.
    Quartz
    B.
    Cristobalite
    C.
    Tridymite
    D.
    None of these

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  7. Silica refractories

    8. A.
    crack when subjected to sudden change of temperature.
    B.
    can not be used in the dome of hot blast stoves.
    C.
    have lower thermal conductivity than fireclay bricks.
    D.
    all (a), (b) and (c)

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  8. PCE value (Segar cone) of superduty refractories is more than 33, which is equivalent to a temperature of __________ °C.

    9. A.
    1520
    B.
    1630
    C.
    1670
    D.
    1730

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  9. Which of the following is not an acidic refractory ?

    10. A.
    Silica bricks
    B.
    Fireclay bricks
    C.
    Bauxite bricks
    D.
    Magnesia bricks

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  10. Insulating refractories should have

    11. A.
    high porosity
    B.
    low thermal conductivity
    C.
    both (a) and (b)
    D.
    neither (a) not (b)

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