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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. Refractories used in/for __________ should have low thermal conductivity.

    2. A.
    coke ovens
    B.
    insulation
    C.
    regenerators
    D.
    muffle furnaces

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  2. 10 to 30% magnesite is added to chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the __________ of chromite.

    3. A.
    spalling resistance
    B.
    refractoriness
    C.
    crushing strength
    D.
    resistance to slag

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  3. Silica bricks are never used for lining the

    4. A.
    beehive coke ovens.
    B.
    by-product coke ovens.
    C.
    dome of blast furnace stoves.
    D.
    roof of open hearth furnace.

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  4. Which is not a natural insulating material?

    5. A.
    Diatomaceous earth/kieselgur
    B.
    Asbestos
    C.
    Vermiculite
    D.
    None of these

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  5. Magnesite refractories are generally not used in the

    6. A.
    electric furnace walls.
    B.
    steel melting furnace.
    C.
    open hearth furnace.
    D.
    burning zone of cement kilns.

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  6. Which is an acidic refractory ?

    7. A.
    Magnesite
    B.
    Dolomite
    C.
    Fireclay
    D.
    Chrome magnesite

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  7. Carborundum used for making crucibles for melting non-ferrous metals is chemically

    8. A.
    silicon carbide
    B.
    silicon nitride
    C.
    crystalline magnesia
    D.
    zirconium sulphate

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  8. Which of the following impurities reduces the refractoriness of magnesite bricks ?

    9. A.
    Al2O3
    B.
    CaO
    C.
    SiO2
    D.
    all (a), (b) & (c)

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  9. Crushing strength of a refractory

    10. A.
    increases with rise in service temperature.
    B.
    decreases with rise in service temperature.
    C.
    is unaffected with change in service temperature.
    D.
    decreases with increase in porosity.

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  10. Ramming masses are used for

    11. A.
    obtaining monolithic working faces.
    B.
    repairing construction of various furnace parts.
    C.
    both (a) & (b).
    D.
    neither (a) nor (b).

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