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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. Sillimanite is a __________ refractory.

    2. A.
    basic
    B.
    neutral
    C.
    high alumina
    D.
    insulating

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  2. High refractorinness of refractory bricks means, that it has a

    3. A.
    high spalling resistance.
    B.
    low spalling resistance.
    C.
    high resistance to fusion.
    D.
    low porosity.

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  3. Conversion of silica mineral to cristobalite is accompanied by reduction in its

    4. A.
    volume
    B.
    specific gravity
    C.
    both (a) & (b)
    D.
    neither (a) nor (b)

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  4. Chrome magnesite is not used in the

    5. A.
    inner lining of L.D. converter.
    B.
    aluminium melting furnaces.
    C.
    wear out lining of steel melting furnaces.
    D.
    all (a), and (b) and (c)

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  5. Which of the following bricks has the most close values of RUL and PCE ?

    6. A.
    Silica bricks
    B.
    Fireclay bricks
    C.
    High alumina bricks
    D.
    Tar dolomite bricks

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  6. Silica refractories are not used in

    7. A.
    coke oven walls.
    B.
    beehive coke ovens.
    C.
    dome and upper portion of B.F. stoves.
    D.
    open hearth furnace roof.

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  7. Refractory materials are never used in the construction of

    8. A.
    segar cones
    B.
    orton cones
    C.
    pressure vessels
    D.
    ovens & retorts

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  8. Segar cones are used for the determination of __________ of refractories.

    9. A.
    softening temperature
    B.
    spalling resistance
    C.
    electrical conductivity
    D.
    resistance to slag attack

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  9. Fireclay bricks are used in the

    10. A.
    furnaces allowed to cool frequently
    B.
    flues
    C.
    chimney linings
    D.
    all (a), (b) and (c)

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  10. Carbon refractories have very high

    11. A.
    wetting characteristics
    B.
    refractoriness
    C.
    thermal conductivity
    D.
    both (b) and (c)

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