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Chemical Engineering :: Refractory Technology

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

  1. __________ is not a single oxiderefractory.

    2. A.
    Zirconia
    B.
    Silicon carbide
    C.
    Magnesia
    D.
    None of these

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  2. Hot blast main (carrying air at 1000°C) in blast furnace are lined with __________ bricks.

    3. A.
    silica
    B.
    fireclay
    C.
    magnesite
    D.
    zirconia

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  3. High alumina refractory compared to fireclay bricks have

    4. A.
    less load bearing capacity.
    B.
    less resistance to slag attack.
    C.
    low refractoriness.
    D.
    high resistance to thermal shock and creep.

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  4. Refractory bricks with lower permeability is produced by using

    5. A.
    higher firing temperature.
    B.
    higher moulding pressure.
    C.
    finer grog size.
    D.
    all (a), (b) and (c).

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  5. Refractory bricks having lower porosity have

    6. A.
    high insulating properties
    B.
    low heat capacity
    C.
    low thermal conductivity
    D.
    greater strength

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  6. In panel test for spalling resistance, the average face temperature of panel assembly is maintained at __________ °C for 24 hours.

    7. A.
    700
    B.
    1000
    C.
    1600
    D.
    2000

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  7. Which is not an acidic refractory ?

    8. A.
    Silica
    B.
    Fireclay
    C.
    High alumina refractory
    D.
    Carbon black

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  8. Natural silica

    9. A.
    mainly contains quartz.
    B.
    is not stable at high temperature.
    C.
    transforms to other allotropic forms i.e tridymite and cristoballite involving very high volume changes.
    D.
    all (a), (b) and (c).

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  9. Thermal conductivity of refractory bricks

    10. A.
    increases with decrease in porosity.
    B.
    decreases with decreases in porosity.
    C.
    is independent of its porosity and is maximum for insulating bricks.
    D.
    increases with the amount of air entrapped in pores.

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  10. Dolomite bricks have good resistance to attack by

    11. A.
    molten steel
    B.
    iron oxide
    C.
    lime slag
    D.
    none of these

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