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  • Question
  • Spalling tendency of refractories is reduced by increasing its


  • Options
  • A. porosity
  • B. specific gravity
  • C. thermal conductivity
  • D. strength

  • Correct Answer
  • porosity 


  • Refractory Technology problems


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    • 1. 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
    • 2. Roof of a basic open hearth furnace is lined with __________ bricks.

    • Options
    • A. silica
    • B. fireclay
    • C. dolomite
    • D. magnesite
    • Discuss
    • 3. Grog addition in fireclay during brick manufacture is done to

    • Options
    • A. reduce its shrinkage on heating.
    • B. impart greater spalling resistance.
    • C. enhance the strength of fired refractories.
    • D. all (a), (b) and (c).
    • Discuss
    • 4. To resist spalling tendency, a refractory should have

    • Options
    • A. greater diffusivity.
    • B. low specific heat.
    • C. low thermal co-efficient of expansion.
    • D. all (a), (b) and (c).
    • Discuss
    • 5. Chrome magnesite brick is not used for lining the

    • Options
    • A. hearth of soaking pits.
    • B. bottom hearth of reheating furnace.
    • C. coke oven regenerator.
    • D. burning zone of limestone rotary kilns.
    • Discuss
    • 6. Colour of fireclay bricks is

    • Options
    • A. light buff to reddish buff
    • B. yellow
    • C. black
    • D. none of these
    • Discuss
    • 7. Which is the stable form of silica upto 1470°C?

    • Options
    • A. Quartz
    • B. Cristobalite
    • C. Tridymite
    • D. None of these
    • Discuss
    • 8. 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
    • 9. 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)
    • Discuss
    • 10. 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


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