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Chemical Engineering :: Refractory Technology

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 refractories depends upon its

    2. A.
    composition
    B.
    texture
    C.
    firing temperature
    D.
    all (a), (b) and (c)

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  2. Tar bonded dolomite bricks

    3. A.
    are stored under controlled temperature & humidity to avoid hydration.
    B.
    are used in outer lining of L.D. converters.
    C.
    have poorer hydration resistance than pitch bonded bricks.
    D.
    all (a), (b) and (c)

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  3. Electrical resistor bars are made of

    4. A.
    silicon carbide
    B.
    alumina
    C.
    zirconia
    D.
    graphite

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  4. Which is not an alumino-silicate refractory?

    5. A.
    Fireclay bricks.
    B.
    Mullite bricks.
    C.
    Tar dolomite bricks.
    D.
    High alumina bricks.

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  5. Periclase refractory contains mainly

    6. A.
    CaO
    B.
    MgO
    C.
    Al2O3
    D.
    SiO2

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  6. Si percentage in silica refractories used in the walls of coke oven is about

    7. A.
    45
    B.
    60
    C.
    80
    D.
    95

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  7. Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material?

    8. A.
    aluminium phosphate
    B.
    water
    C.
    lime
    D.
    plaster of paris

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  8. High thermal conductivity of a refractory material is not important, when it is to be used in the

    9. A.
    coke oven regenarators
    B.
    muffle furnace
    C.
    blast furnace
    D.
    recuperators

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  9. Maximum safe working temperature for fireclay bricks is about __________ °C.

    10. A.
    1150
    B.
    1300
    C.
    1450
    D.
    1550

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  10. Ferromagnetic ceramic material is not used in the

    11. A.
    thermal insulation
    B.
    transformers
    C.
    magnetic switches
    D.
    television sets

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