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


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

  • Correct Answer
  • nuclear reactors, missiles & space crafts. 


  • Refractory Technology problems


    Search Results


    • 1. Magnesite refractories are used for the construction of those furnaces, which are

    • Options
    • A. not required to resist the corrosive action of basic slag.
    • B. not subjected to fluctuation in temperature.
    • C. used for raising & maintaining high temperature.
    • D. both (b) and (c)
    • Discuss
    • 2. Refractories are dried in the

    • Options
    • A. rotary kilns
    • B. tunnel kilns
    • C. sun
    • D. none of these
    • Discuss
    • 3. Outer combustion chamber of blast furnace stove is lined with __________ bricks.

    • Options
    • A. fireclay
    • B. silica
    • C. chrome magnesite
    • D. zirconia
    • Discuss
    • 4. Which one expands on heating?

    • Options
    • A. Silica bricks
    • B. Fireclay bricks
    • C. Both (a) & (b)
    • D. Neither (a) nor (b)
    • Discuss
    • 5. Hollow refractory bricks are made by

    • Options
    • A. slip casting
    • B. hand moulding
    • C. pressing/machine moulding
    • D. extrusion
    • Discuss
    • 6. Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, becaus of its

    • Options
    • A. non-wetting characteristic.
    • B. high thermal conductivity.
    • C. high crushing strength.
    • D. none of these.
    • Discuss
    • 7. Walls, roofs & combustion chambers of annealing furnaces are made of __________ bricks.

    • Options
    • A. high duty fireclay
    • B. silica
    • C. mullite
    • D. carborundum
    • Discuss
    • 8. Water content in ground refractory material to be shaped into bricks by hand moulding is about __________ percent.

    • Options
    • A. 5
    • B. 20
    • C. 40
    • D. 55
    • Discuss
    • 9. A steel member used in the furnace construction to take the thrust of the brickwork is called

    • Options
    • A. buckstay
    • B. breast wall
    • C. armouring
    • D. baffle
    • Discuss
    • 10. Grog

    • Options
    • A. contains both alumina and silica.
    • B. iscrushed firebrick.
    • C. is a non-plastic material.
    • D. all (a), (b) and (c).
    • Discuss


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