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  • Question
  • Carbon refractory blocks


  • Options
  • A. are wetted by molten iron.
  • B. are used in the hearth of blast furnace.
  • C. are acidic in nature.
  • D. all (a), (b) and (c).

  • Correct Answer
  • are used in the hearth of blast furnace. 


  • Refractory Technology problems


    Search Results


    • 1. Periclase refractory contains mainly

    • Options
    • A. CaO
    • B. MgO
    • C. Al2O3
    • D. SiO2
    • Discuss
    • 2. High density refractory bricks have lower

    • Options
    • A. spalling resistance.
    • B. thermal conductivity.
    • C. fusion point.
    • D. slag penetration resistance.
    • Discuss
    • 3. Tar bonded dolomite bricks

    • Options
    • A. are stored under controlled temperature & humidity to avoid hydration.
    • B. are used in outer lining of L.D. converters.
    • C. have poorer hydration resistance than pitch bonded bricks.
    • D. all (a), (b) and (c)
    • Discuss
    • 4. Maximum safe working temperature for fireclay bricks is about __________ °C.

    • Options
    • A. 1150
    • B. 1300
    • C. 1450
    • D. 1550
    • Discuss
    • 5. Electrical resistor bars are made of

    • Options
    • A. silicon carbide
    • B. alumina
    • C. zirconia
    • D. graphite
    • Discuss
    • 6. Fusion point of an acidic refractory material is

    • Options
    • A. increased by the addition of basic oxides.
    • B. reduced by the addition of basic oxides.
    • C. not affected by the addition of basic oxides.
    • D. always more than 2500°C.
    • Discuss
    • 7. Machine moulding of dry mixture of refractories requires a pressure of the order of __________ kg/cm2.

    • Options
    • A. 10
    • B. 100
    • C. 500
    • D. 1000
    • Discuss
    • 8. Cold crushing strength of refractories depends upon its

    • Options
    • A. composition
    • B. texture
    • C. firing temperature
    • D. all (a), (b) and (c)
    • Discuss
    • 9. Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage?

    • Options
    • A. Tar bonded dolomite bricks
    • B. Fireclay bricks
    • C. Mullite bricks
    • D. Magnesite bricks
    • Discuss
    • 10. Which is a basic refractory?

    • Options
    • A. Fireclay
    • B. Silica
    • C. Chrome magnesite
    • D. None of these
    • Discuss


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