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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. An ideal refractory should have high

    2. A.
    spalling rate
    B.
    fusion point
    C.
    shrinkage ability
    D.
    none of these

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  2. Ganister is a source of the

    3. A.
    silica
    B.
    periclase
    C.
    lime
    D.
    none of these

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  3. Which brick undergoes maximum shrinkage on drying ?

    4. A.
    Tar bonded dolomite bricks
    B.
    Fireclay bricks
    C.
    Magnesite bricks
    D.
    Chromite bricks

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  4. Which is the stable form of silica upto 1470°C ?

    5. A.
    Quartz
    B.
    Cristobalite
    C.
    Tridymite
    D.
    None of these

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  5. Hot face insulating linings of high purity alumina fused mullite are used, where

    6. A.
    very high temperatures are involved.
    B.
    highly reducing conditions are involved.
    C.
    presence of iron or silica is harmful.
    D.
    all (a), (b) and (c).

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  6. Semi-silica bricks compared to silica bricks have

    7. A.
    less fusion point.
    B.
    better spalling resistance.
    C.
    both (a) and (b).
    D.
    neither (a) not (b).

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  7. Mixing of ground refractory material and water is done in a __________ mill.

    8. A.
    pug
    B.
    ball
    C.
    tube
    D.
    rod

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  8. Maximum apparent porosity of magnesite bricks is about __________ percent.

    9. A.
    8
    B.
    24
    C.
    44
    D.
    58

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  9. Dilatometer is used for the determination of __________ of refractories.

    10. A.
    modulus of rupture
    B.
    permanent linear change
    C.
    resistance to CO attack
    D.
    RUL

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  10. With decrease in porosity, the __________ of the refractories decreases.

    11. A.
    strength
    B.
    thermal conductivity
    C.
    spalling resistance
    D.
    none of these

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