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  • Question
  • 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.

  • Correct Answer
  • hearth of blast furnace. 


  • Refractory Technology problems


    Search Results


    • 1. 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
    • 2. Magnesite bricks have poor resistance to attack by __________ slag.

    • Options
    • A. lime
    • B. basic
    • C. acid
    • D. none of these
    • Discuss
    • 3. __________ 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
    • Discuss
    • 4. 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
    • 5. 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
    • 6. 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
    • 7. Which of the following is not a high alumina refractory material?

    • Options
    • A. Kyanite
    • B. Sillimanite
    • C. Diaspore
    • D. Periclase
    • Discuss
    • 8. Porosity of fireclay refractories is __________ percent.

    • Options
    • A. 5-10
    • B. 10-25
    • C. 25-35
    • D. 35-50
    • Discuss
    • 9. Which one contains minimum percentage of SiO2?

    • Options
    • A. Firebrick
    • B. Sillimanite
    • C. Semi-silica
    • D. Aluminous firebrick
    • Discuss
    • 10. Zirconia refractories are not used in

    • Options
    • A. making sheaths for thermocouple.
    • B. lining high temperature ceramic kilns.
    • C. furnaces subjected to fluctuating temperature.
    • D. high frequency induction furnaces in the form of inductors.
    • Discuss


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