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Chemical Engineering :: Refractory Technology

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

  1. Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the

    2. A.
    washing action of metal.
    B.
    corrosion by layer of slag.
    C.
    both (a) & (b).
    D.
    neither (a) nor (b).

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  2. Pyrometric cone equivalent (PCE) of a refractory is the measure of its

    3. A.
    spalling resistance.
    B.
    fusion point.
    C.
    resistance to slag penetration.
    D.
    resistance to carbon monoxide attack.

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  3. Highest melting (m.p = 3070°C) oxide refractory is

    4. A.
    alumina
    B.
    thoria
    C.
    zirconia
    D.
    magnesia

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  4. Chrome magnesite brick is not used for lining the

    5. A.
    hearth of soaking pits.
    B.
    bottom hearth of reheating furnace.
    C.
    coke oven regenerator.
    D.
    burning zone of limestone rotary kilns.

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  5. Which one contains minimum percentage of SiO2?

    6. A.
    Firebrick
    B.
    Sillimanite
    C.
    Semi-silica
    D.
    Aluminous firebrick

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  6. Which of the following bricks should not be used, if the furnace is to be used intermit-tantly ?

    7. A.
    Firebricks
    B.
    Silica bricks
    C.
    Silicon carbide bricks
    D.
    Sillimanite

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  7. Refractory castables are used for

    8. A.
    producing monolithic linings.
    B.
    patch work.
    C.
    minimising the number of joints in the structure.
    D.
    all (a), (b) and (c).

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  8. The largest consumer of refractories is the __________ industry.

    9. A.
    cement
    B.
    metallurgical
    C.
    fertiliser
    D.
    power

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  9. Graphite or carbon refractories

    10. A.
    exihibit wetting characteristics.
    B.
    should be used in neutral or reducing atmosphere.
    C.
    exhibit high shrinkage on thermal treatment.
    D.
    are not resistant to corrosion by slag.

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  10. 'Spinel', a refractory mineral is chemically represented as

    11. A.
    MgAl2O4
    B.
    MgAl2O3
    C.
    MgSO4
    D.
    MgAl2O3.2H2O

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