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  • Question
  • Permeability of bricks is a measure of the


  • Options
  • A. refractoriness.
  • B. melting point.
  • C. rate at which a fluid will pass through the pores.
  • D. expansion during heating.

  • Correct Answer
  • rate at which a fluid will pass through the pores. 


  • Refractory Technology problems


    Search Results


    • 1. Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as __________ percent.

    • Options
    • A. 55
    • B. 70
    • C. 80
    • D. 90
    • Discuss
    • 2. Which form of silica has the highest specific gravity?

    • Options
    • A. Quartz
    • B. Cristobalite
    • C. Tridymite
    • D. All have the same specific gravity
    • Discuss
    • 3. Which is an acidic refractory?

    • Options
    • A. Magnesite
    • B. Dolomite
    • C. Fireclay
    • D. Chrome magnesite
    • Discuss
    • 4. Which is not an acidic refractory?

    • Options
    • A. Silica
    • B. Fireclay
    • C. High alumina refractory
    • D. Carbon black
    • Discuss
    • 5. Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with __________ bricks.

    • Options
    • A. bakelite impregnated or fused periclase
    • B. silica
    • C. semi-silica
    • D. fireclay
    • Discuss
    • 6. Pyrometric cone equivalent (PCE) of a refractory is the measure of its

    • Options
    • A. spalling resistance.
    • B. fusion point.
    • C. resistance to slag penetration.
    • D. resistance to carbon monoxide attack.
    • Discuss
    • 7. 'Spinel', a refractory mineral is chemically represented as

    • Options
    • A. MgAl2O4
    • B. MgAl2O3
    • C. MgSO4
    • D. MgAl2O3.2H2O
    • Discuss
    • 8. Refractory castables are used for

    • Options
    • A. producing monolithic linings.
    • B. patch work.
    • C. minimising the number of joints in the structure.
    • D. all (a), (b) and (c).
    • Discuss
    • 9. Which brick undergoes maximum shrinkage on drying?

    • Options
    • A. Tar bonded dolomite bricks
    • B. Fireclay bricks
    • C. Magnesite bricks
    • D. Chromite bricks
    • Discuss
    • 10. Carbon refractories

    • Options
    • A. do not burn/oxidise, when exposed to air on heating.
    • B. are not attacked by slags, as they are not wetted by melts.
    • C. do not resist temperature fluctuations.
    • D. have extremely low thermal & electrical conductivities.
    • Discuss


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