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Home Chemical Engineering Refractory Technology Comments

  • Question
  • 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.

  • Correct Answer
  • fracture due to uneven expansion at high temperature. 


  • Refractory Technology problems


    Search Results


    • 1. Cold crushing strength of fireclay bricks is about __________ kgf/cm2.

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

    • Options
    • A. silica
    • B. periclase
    • C. lime
    • D. none of these
    • Discuss
    • 3. 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
    • 4. Furnace atmosphere for softening temperature determination of refractories (in which segar cones are placed) should be

    • Options
    • A. oxidising
    • B. neutral
    • C. either (a) or (b)
    • D. neither (a) nor (b)
    • Discuss
    • 5. Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as __________ percent.

    • Options
    • A. 10
    • B. 15
    • C. 20
    • D. 30
    • Discuss
    • 6. 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
    • 7. __________ 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
    • 8. Magnesite bricks have poor resistance to attack by __________ slag.

    • Options
    • A. lime
    • B. basic
    • C. acid
    • D. none of these
    • Discuss
    • 9. 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
    • 10. 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


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