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Chemical Engineering :: Refractory Technology

  1. With increase in the alumina content, the refractoriness of high alumina refractories

  2. A.
    increases
    B.
    decreases
    C.
    remains same
    D.
    may increase or decrease

  3. A steel member used in the furnace construction to take the thrust of the brickwork is called

  4. A.
    buckstay
    B.
    breast wall
    C.
    armouring
    D.
    baffle

  5. With increase in the porosity, thermal spalling resistance of fireclay brick

  6. A.
    increases
    B.
    decreases
    C.
    remains same
    D.
    may increase or decrease

  7. Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of

  8. A.
    segar cones.
    B.
    muffles for muffle furnaces.
    C.
    insulating bricks.
    D.
    crucibles used for melting of high purity metals.

  9. Maximum alumina content in high alumina refractory can be as high as __________ percent.

  10. A.
    30
    B.
    50
    C.
    70
    D.
    90

  11. Refractories are dried in the

  12. A.
    rotary kilns
    B.
    tunnel kilns
    C.
    sun
    D.
    none of these

  13. Cermets are combination of ceramic and metallic materials due to which they have high strength & resistance to high temperature. Cermets are used in the

  14. A.
    hearth of the blast furnace.
    B.
    nuclear reactors, missiles & space crafts.
    C.
    insulation of high temperature furnaces.
    D.
    roof of electric furnaces.

  15. Hot metal runner in blast furnace are lined with __________ bricks.

  16. A.
    silica
    B.
    carborundum
    C.
    fireclay
    D.
    magnesite

  17. Spray test determines the __________ of refractories.

  18. A.
    resistance to slag penetration
    B.
    resistance to CO attack
    C.
    RUL
    D.
    permanent linear change