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  • Question
  • Alumina-graphite bricks are used for lining the


  • Options
  • A. slide gate in teeming laddies.
  • B. continuous casting systems.
  • C. both (a) and (b).
  • D. neither (a) nor (b).

  • Correct Answer
  • both (a) and (b). 


  • Refractory Technology problems


    Search Results


    • 1. Spalling resistance of a refractory can not be increased by

    • Options
    • A. increasing its porosity.
    • B. using a coarser grog during its manufacture.
    • C. decreasing its thermal co-efficient of expansion.
    • D. making it denser.
    • Discuss
    • 2. Chromite refractories are

    • Options
    • A. acidic refractory.
    • B. neutral refractory.
    • C. basic refractory.
    • D. fired at a temperature of 600°C only.
    • Discuss
    • 3. 'Super refractories' are made from pure

    • Options
    • A. carbides
    • B. oxides
    • C. borides
    • D. nitrides
    • Discuss
    • 4. Fireclay refractories have

    • Options
    • A. low co-efficient of thermal expansion.
    • B. poor thermal spalling resistance.
    • C. tendency to expand unduly high during firing.
    • D. very high cost.
    • Discuss
    • 5. Which of the following is not an acidic refractory?

    • Options
    • A. Silica bricks
    • B. Fireclay bricks
    • C. Bauxite bricks
    • D. Magnesia bricks
    • Discuss
    • 6. Zirconia refractory

    • Options
    • A. does not react with basic slags.
    • B. is produced from baddeleyite.
    • C. can not be used as an insulator.
    • D. has poor electrical conductivity at high temperature.
    • Discuss
    • 7. With increasing alumina content, the fusion point of high alumina refractories

    • Options
    • A. increases.
    • B. decreases.
    • C. remains constant.
    • D. may increase or decrease ; depends on its alumina content.
    • Discuss
    • 8. Which of the following does not occur during firing/burning of refractories?

    • Options
    • A. Removal of water of hydration.
    • B. Vitrification.
    • C. Decrease in crushing strength.
    • D. Development of stable mineral form.
    • Discuss
    • 9. Cermets are

    • Options
    • A. composite material containing both ceramic & metallic constituents.
    • B. having high strength & resistance to high temperature.
    • C. used in space vehicles, missiles & nuclear energy plants.
    • D. all (a), (b) and (c).
    • Discuss
    • 10. Which of the following consumes the maximum tonnage of refractories annually in an integrated steel plant?

    • Options
    • A. Soaking pits
    • B. Ceheating furnace
    • C. L.D. converter
    • D. Rotary lime kiln
    • Discuss


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