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  • Question
  • Which is an acidic refractory?


  • Options
  • A. Magnesite
  • B. Dolomite
  • C. Fireclay
  • D. Chrome magnesite

  • Correct Answer
  • Fireclay 


  • Refractory Technology problems


    Search Results


    • 1. Which is not an acidic refractory?

    • Options
    • A. Silica
    • B. Fireclay
    • C. High alumina refractory
    • D. Carbon black
    • Discuss
    • 2. 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
    • 3. Thermal conductivity of refractory bricks

    • Options
    • A. increases with decrease in porosity.
    • B. decreases with decreases in porosity.
    • C. is independent of its porosity and is maximum for insulating bricks.
    • D. increases with the amount of air entrapped in pores.
    • Discuss
    • 4. Addition of grog in fireclay brick during its manufacture is advantageous, because it results in

    • Options
    • A. less shrinkage in heating, decreased apparent porosity & increased specific gravity.
    • B. high strength & thermal spalling resistance.
    • C. less addition of water to get a workable plasticity & lesser time required for drying the raw refractories and hence increased rate of production.
    • D. all (a), (b) and (c).
    • Discuss
    • 5. Fireclay bricks are not used in the

    • Options
    • A. blast furnace
    • B. hot blast stove
    • C. cupola
    • D. wall of coke oven
    • Discuss
    • 6. Which form of silica has the highest specific gravity?

    • Options
    • A. Quartz
    • B. Cristobalite
    • C. Tridymite
    • D. All have the same specific gravity
    • Discuss
    • 7. 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
    • 8. 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.
    • Discuss
    • 9. 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
    • 10. 'Spinel', a refractory mineral is chemically represented as

    • Options
    • A. MgAl2O4
    • B. MgAl2O3
    • C. MgSO4
    • D. MgAl2O3.2H2O
    • Discuss


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