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  • Question
  • Fireclay bricks is not used for lining the


  • Options
  • A. cupola.
  • B. gas producer.
  • C. bottom of hot metal mixer.
  • D. roof of open hearth furnace.

  • Correct Answer
  • bottom of hot metal mixer. 


  • Refractory Technology problems


    Search Results


    • 1. With increase in the density of silica refractories, its

    • Options
    • A. resistance to slag attack increases.
    • B. spalling resistance reduces.
    • C. both (a) and (b).
    • D. neither (a) nor (b).
    • Discuss
    • 2. __________ bricks should not be used in oxidising atmosphere.

    • Options
    • A. Tar dolomite
    • B. Carbon
    • C. Silica
    • D. Fireclay
    • Discuss
    • 3. Thermal spalling mainly occurs during __________ of furnaces.

    • Options
    • A. cooling down
    • B. warming up
    • C. both (a) & (b)
    • D. neither (a) nor (b)
    • Discuss
    • 4. Which is a neutral refractory?

    • Options
    • A. Graphite
    • B. Magnesite chrome
    • C. Silica
    • D. Magnesia
    • Discuss
    • 5. Faster rate of drying of moulded refractories results in high __________ of refractories.

    • Options
    • A. green strength
    • B. voids
    • C. shrinkage
    • D. both (b) and (c)
    • Discuss
    • 6. Fusion temperature of pure silica (SiO2) is __________ °C.

    • Options
    • A. 1350
    • B. 1715
    • C. 2570
    • D. 2800
    • Discuss
    • 7. __________ is not a single oxiderefractory.

    • Options
    • A. Zirconia
    • B. Silicon carbide
    • C. Magnesia
    • D. None of these
    • Discuss
    • 8. The highest melting pure oxide (m.p. > 3000°C)is

    • Options
    • A. thoria
    • B. alumina
    • C. beryllia
    • D. zirconia
    • Discuss
    • 9. Natural silica

    • Options
    • A. mainly contains quartz.
    • B. is not stable at high temperature.
    • C. transforms to other allotropic forms i.e tridymite and cristoballite involving very high volume changes.
    • D. all (a), (b) and (c).
    • Discuss
    • 10. Bottom of basic open hearth furnace are constructed of

    • Options
    • A. dead burnt magnesite ramming mass.
    • B. porous fireclay bricks.
    • C. semi-silica bricks.
    • D. silicon carbide bricks.
    • Discuss


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