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Chemical Engineering :: Refractory Technology

  1. Periclase is

  2. A.
    crystalline form of MgO.
    B.
    MgCO3.
    C.
    ZrSO4.
    D.
    amorphous magnesite.

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  3. Which of the following is not a neutral refractory ?

  4. A.
    Silicon carbide
    B.
    Magnesite
    C.
    Chromite
    D.
    Graphite

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  5. Which is a basic refractory ?

  6. A.
    Fireclay
    B.
    Silica
    C.
    Chrome magnesite
    D.
    None of these

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  7. Cold crushing strength of a refractory does not depend upon its

  8. A.
    shape
    B.
    composition
    C.
    firing temperature
    D.
    texture

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  9. Refractoriness under load (RUL) is the most important property for the refractory bricks

  10. A.
    at the hearth bottom of the furnace on which stock is placed.
    B.
    used for furnace insulation.
    C.
    used in the roof of the furnace.
    D.
    none of these.

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  11. Which of the following consumes the maximum tonnage of refractories annually in an integrated steel plant ?

  12. A.
    Soaking pits
    B.
    Ceheating furnace
    C.
    L.D. converter
    D.
    Rotary lime kiln

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  13. __________ nozzles are used in continuous casting of steel,

  14. A.
    Zircon
    B.
    Thoria
    C.
    Carborundum
    D.
    Beryllia

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  15. silicon carbide refractories have very low

  16. A.
    refractoriness (< 1700°C).
    B.
    thermal conductivity.
    C.
    resistance to thermal shock.
    D.
    none of these.

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  17. Basic bricks are not made of

  18. A.
    fireclay
    B.
    magnesite
    C.
    foresterite
    D.
    chromite

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  19. With increase in the alumina content in firebricks, its fusion point (refractoriness)

  20. A.
    decreases linearly
    B.
    remains unchanged
    C.
    increases
    D.
    decreases

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