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  • Question
  • 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).

  • Correct Answer
  • all (a), (b) and (c). 


  • Refractory Technology problems


    Search Results


    • 1. 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
    • 2. 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
    • 3. Porosity is induced in insulating refractories by adding

    • Options
    • A. powdered naphthalene.
    • B. ammonium chloride/sulphate.
    • C. calcium phosphate.
    • D. all (a), (b) and (c).
    • Discuss
    • 4. The largest consumer of refractories is the __________ industry.

    • Options
    • A. cement
    • B. metallurgical
    • C. fertiliser
    • D. power
    • Discuss
    • 5. Which of the following bricks should not be used, if the furnace is to be used intermit-tantly?

    • Options
    • A. Firebricks
    • B. Silica bricks
    • C. Silicon carbide bricks
    • D. Sillimanite
    • Discuss
    • 6. Ganister is a source of the

    • Options
    • A. silica
    • B. periclase
    • C. lime
    • D. none of these
    • Discuss
    • 7. Cold crushing strength of fireclay bricks is about __________ kgf/cm2.

    • Options
    • A. 50-100
    • B. 100-150
    • C. 200-400
    • D. 500-1000
    • Discuss
    • 8. 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
    • 9. 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
    • 10. __________ 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


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