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  • Question
  • __________ bricks should not be used in oxidising atmosphere.


  • Options
  • A. Tar dolomite
  • B. Carbon
  • C. Silica
  • D. Fireclay

  • Correct Answer
  • Carbon 


  • Refractory Technology problems


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    • 1. Thermal spalling mainly occurs during __________ of furnaces.

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

    • Options
    • A. Graphite
    • B. Magnesite chrome
    • C. Silica
    • D. Magnesia
    • Discuss
    • 3. 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
    • 4. Pick out the wrong statement.

    • Options
    • A. A ceramic material which becomes fluid upon heating and can be moulded in liquid/viscous state is termed s glass.
    • B. Ceramic materials do not undergo vitrification on heating.
    • C. Ceramic materials are brittle in nature.
    • D. Non-oxide ceramic materials generally act as a semi-conductor.
    • Discuss
    • 5. Pure oxide refractories are generally monocrystaliine in nature and are self bonded __________ bricks are generally used as moderator in nuclear reactors.

    • Options
    • A. Beryllia
    • B. Carborundum
    • C. Corundum
    • D. Thoria
    • Discuss
    • 6. 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
    • 7. 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.
    • Discuss
    • 8. Fusion temperature of pure silica (SiO2) is __________ °C.

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

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

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


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