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Home Chemical Engineering Refractory Technology Comments

  • Question
  • 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).

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


  • Refractory Technology problems


    Search Results


    • 1. Fireclay bricks are not used in the

    • Options
    • A. blast furnace
    • B. hot blast stove
    • C. cupola
    • D. wall of coke oven
    • Discuss
    • 2. Lower wall courses of soaking pits are made of __________ bricks to avoid the action of molten slag & scale.

    • Options
    • A. chrome or magnesite
    • B. silicon carbide
    • C. silica
    • D. lowduty fireclay
    • Discuss
    • 3. Which is not a natural insulating material?

    • Options
    • A. Diatomaceous earth/kieselgur
    • B. Asbestos
    • C. Vermiculite
    • D. None of these
    • Discuss
    • 4. Refractory bricks with lower permeability is produced by using

    • Options
    • A. higher firing temperature.
    • B. higher moulding pressure.
    • C. finer grog size.
    • D. all (a), (b) and (c).
    • Discuss
    • 5. Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of __________ percent respectively.

    • Options
    • A. 80 and 20
    • B. 20 and 80
    • C. 50 and 50
    • D. 60 and 40
    • Discuss
    • 6. 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
    • 7. 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
    • 8. Which is not an acidic refractory?

    • Options
    • A. Silica
    • B. Fireclay
    • C. High alumina refractory
    • D. Carbon black
    • Discuss
    • 9. Which is an acidic refractory?

    • Options
    • A. Magnesite
    • B. Dolomite
    • C. Fireclay
    • D. Chrome magnesite
    • Discuss
    • 10. Which form of silica has the highest specific gravity?

    • Options
    • A. Quartz
    • B. Cristobalite
    • C. Tridymite
    • D. All have the same specific gravity
    • Discuss


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