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Refractory Technology - Section 1
Refractory Technology - Section 2
Refractory Technology - Section 3
Refractory Technology - Section 4
Refractory Technology - Section 5

  1. Cold crushing strength of ordinary fireclay brick is about 950 kg/cm2 . On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as __________ kg/cm2 .

    2. A.
    450
    B.
    250
    C.
    150
    D.
    65

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  2. Zirconia refractory

    3. A.
    does not react with basic slags.
    B.
    is produced from baddeleyite.
    C.
    can not be used as an insulator.
    D.
    has poor electrical conductivity at high temperature.

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  3. Which one contains maximum percentage of Al2O3 ?

    4. A.
    Firebrick
    B.
    Sillimanite
    C.
    Magnesite
    D.
    Aluminous firebrick

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  4. Which of the following does not occur during firing/burning of refractories ?

    5. A.
    Removal of water of hydration.
    B.
    Vitrification.
    C.
    Decrease in crushing strength.
    D.
    Development of stable mineral form.

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  5. Silicon carbide refractories are used in the

    6. A.
    muffle furnace
    B.
    zinc smelting furnace
    C.
    ceramic recuperators
    D.
    all (a), (b) and (c)

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  6. High density refractory bricks have lower

    7. A.
    spalling resistance.
    B.
    thermal conductivity.
    C.
    fusion point.
    D.
    slag penetration resistance.

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  7. Silliminite (Al2O3.SiO2) refractory, which is a neutral refractory, is not used in

    8. A.
    pottery furnace
    B.
    glass melting furnace
    C.
    crucibles
    D.
    gas retorts

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  8. Zircon refractories have

    9. A.
    low co-efficient of expansion.
    B.
    high RUL (1600°C) and refractoriness (> 2000°C).
    C.
    high spalling resistance.
    D.
    all (a), (b) and (c).

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  9. Cermets are

    10. A.
    composite material containing both ceramic & metallic constituents.
    B.
    having high strength & resistance to high temperature.
    C.
    used in space vehicles, missiles & nuclear energy plants.
    D.
    all (a), (b) and (c).

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  10. Carbon refractory blocks

    11. A.
    are wetted by molten iron.
    B.
    are used in the hearth of blast furnace.
    C.
    are acidic in nature.
    D.
    all (a), (b) and (c).

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