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  • Question
  • Conversion of silica mineral to cristobalite is accompanied by reduction in its


  • Options
  • A. volume
  • B. specific gravity
  • C. both (a) & (b)
  • D. neither (a) nor (b)

  • Correct Answer
  • specific gravity 


  • Refractory Technology problems


    Search Results


    • 1. Tar dolomite bricks are used in the

    • Options
    • A. basic Bessemer converter
    • B. basic open hearth furnace
    • C. electric furnaces
    • D. all (a), (b) and (c)
    • Discuss
    • 2. Which is the stable form of silica upto 1470°C?

    • Options
    • A. Quartz
    • B. Cristobalite
    • C. Tridymite
    • D. None of these
    • Discuss
    • 3. Colour of fireclay bricks is

    • Options
    • A. light buff to reddish buff
    • B. yellow
    • C. black
    • D. none of these
    • Discuss
    • 4. Spalling tendency of refractories is reduced by increasing its

    • Options
    • A. porosity
    • B. specific gravity
    • C. thermal conductivity
    • D. strength
    • Discuss
    • 5. Which property is important for bricks used in the combustion chamber & dome of blast furnace stoves?

    • Options
    • A. High refractoriness.
    • B. High resistance to spalling.
    • C. High strength and density.
    • D. All (a), (b) and (c).
    • Discuss
    • 6. Chrome magnesite is not used in the

    • Options
    • A. inner lining of L.D. converter.
    • B. aluminium melting furnaces.
    • C. wear out lining of steel melting furnaces.
    • D. all (a), and (b) and (c)
    • Discuss
    • 7. Sillimanite is a __________ refractory.

    • Options
    • A. basic
    • B. neutral
    • C. high alumina
    • D. insulating
    • Discuss
    • 8. The main raw material for manufacture of silicon carbide refractories is

    • Options
    • A. corrundum
    • B. carborundum
    • C. bauxite
    • D. periclase
    • Discuss
    • 9. High refractorinness of refractory bricks means, that it has a

    • Options
    • A. high spalling resistance.
    • B. low spalling resistance.
    • C. high resistance to fusion.
    • D. low porosity.
    • Discuss
    • 10. Which furnace consumes maximum refractory annually in an integrated steel plant?

    • Options
    • A. Soaking pit
    • B. Blastfurnace
    • C. L.D. converter
    • D. Coke ovens
    • Discuss


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