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  • Question
  • __________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold.


  • Options
  • A. High thermal conductivity
  • B. Low porosity
  • C. Non-wetting characteristics
  • D. High density

  • Correct Answer
  • Non-wetting characteristics 


  • Refractory Technology problems


    Search Results


    • 1. High alumina refractories are used in the

    • Options
    • A. dome of blast furnace stoves.
    • B. electric arc furnace roof.
    • C. glass melting furnaces.
    • D. all (a), (b) and (c).
    • Discuss
    • 2. Spalling of a refractory means its

    • Options
    • A. softening.
    • B. fracture due to uneven expansion at high temperature.
    • C. resistancce to compressive loads.
    • D. resistance to chemical action of gases and molten fluxes.
    • Discuss
    • 3. Cold crushing strength of fireclay bricks is about __________ kgf/cm2.

    • Options
    • A. 50-100
    • B. 100-150
    • C. 200-400
    • D. 500-1000
    • Discuss
    • 4. Ganister is a source of the

    • Options
    • A. silica
    • B. periclase
    • C. lime
    • D. none of these
    • Discuss
    • 5. Magnesite chrome bricks are used in the

    • Options
    • A. roof lining of basic open hearth & other basic furnaces.
    • B. reheating furnaces.
    • C. soaking pits.
    • D. all (a), (b) and (c).
    • Discuss
    • 6. Magnesite bricks have poor resistance to attack by __________ slag.

    • Options
    • A. lime
    • B. basic
    • C. acid
    • D. none of these
    • Discuss
    • 7. Porosity of silica bricks varies from __________ percent.

    • Options
    • A. 5 to 10
    • B. 20 to 30
    • C. 45 to 60
    • D. 60 to 75
    • Discuss
    • 8. Carbon refractories are exclusively used in the

    • Options
    • A. hearth of blast furnace.
    • B. walls of coke oven.
    • C. regenerators of coke oven.
    • D. side wall of soaking pits.
    • Discuss
    • 9. Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm2 ) is __________ °C.

    • Options
    • A. 500
    • B. 1000
    • C. >1350
    • D. >2000
    • Discuss
    • 10. Which of the following is not a high alumina refractory material?

    • Options
    • A. Kyanite
    • B. Sillimanite
    • C. Diaspore
    • D. Periclase
    • Discuss


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