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Home ‣ Chemical Engineering ‣ Refractory Technology Comments
  • Question

  • Which one contains maximum percentage of Al2O3?


  • Options
  • A. Firebrick
  • B. Sillimanite
  • C. Magnesite
  • D. Aluminous firebrick

  • Correct Answer
  • Sillimanite 

    • Refractory Technology problems

    Search Results

    • 1. PCE value (Segar cone) of superduty refractories is more than 33, which is equivalent to a temperature of __________ °C.

    • Options
    • A. 1520
    • B. 1630
    • C. 1670
    • D. 1730
      • Discuss
    • 2. Cold crushing strength of a refractory does not depend upon its

    • Options
    • A. shape
    • B. composition
    • C. firing temperature
    • D. texture
      • Discuss
    • 3. Insulating refractories should have

    • Options
    • A. high porosity
    • B. low thermal conductivity
    • C. both (a) and (b)
    • D. neither (a) not (b)
      • Discuss
    • 4. Ferromagnetic ceramic material is not used in the

    • Options
    • A. thermal insulation
    • B. transformers
    • C. magnetic switches
    • D. television sets
      • Discuss
    • 5. Chrome magnesite bricks are used in the

    • Options
    • A. side walls of soaking pits and arc furnaces.
    • B. copper melting furnaces & converters.
    • C. burner block of glass tanks.
    • D. all (a), (b) and (c)
      • Discuss
    • 6. Maximum water percentage in refractory mix meant for hand moulding may be as high as __________ percent.

    • Options
    • A. 2-3
    • B. 5-7
    • C. 7-12
    • D. 14-20
      • Discuss
    • 7. High thermal conductivity of a refractory material is not important, when it is to be used in the

    • Options
    • A. coke oven regenarators
    • B. muffle furnace
    • C. blast furnace
    • D. recuperators
      • Discuss
    • 8. Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material?

    • Options
    • A. aluminium phosphate
    • B. water
    • C. lime
    • D. plaster of paris
      • Discuss
    • 9. Fireclay bricks are never used in the

    • Options
    • A. beehive oven
    • B. coke oven walls
    • C. zinc roaster
    • D. lead blast furnace
      • Discuss
    • 10. The linear thermal expansion of __________ bricks upto 1000 °C is very low of the order of ? 0.5 percent.

    • Options
    • A. fireclay
    • B. silica
    • C. magnesite
    • D. corundum
      • Discuss

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