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  • Question
  • Which one contains minimum percentage of SiO2?


  • Options
  • A. Firebrick
  • B. Sillimanite
  • C. Semi-silica
  • D. Aluminous firebrick

  • Correct Answer
  • Sillimanite 


  • Refractory Technology problems


    Search Results


    • 1. Porosity of fireclay refractories is __________ percent.

    • Options
    • A. 5-10
    • B. 10-25
    • C. 25-35
    • D. 35-50
    • Discuss
    • 2. Which of the following is not a high alumina refractory material?

    • Options
    • A. Kyanite
    • B. Sillimanite
    • C. Diaspore
    • D. Periclase
    • Discuss
    • 3. Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm2 ) is __________ °C.

    • Options
    • A. 500
    • B. 1000
    • C. >1350
    • D. >2000
    • Discuss
    • 4. Carbon refractories are exclusively used in the

    • Options
    • A. hearth of blast furnace.
    • B. walls of coke oven.
    • C. regenerators of coke oven.
    • D. side wall of soaking pits.
    • Discuss
    • 5. Porosity of silica bricks varies from __________ percent.

    • Options
    • A. 5 to 10
    • B. 20 to 30
    • C. 45 to 60
    • D. 60 to 75
    • Discuss
    • 6. Zirconia refractories are not used in

    • Options
    • A. making sheaths for thermocouple.
    • B. lining high temperature ceramic kilns.
    • C. furnaces subjected to fluctuating temperature.
    • D. high frequency induction furnaces in the form of inductors.
    • Discuss
    • 7. With decrease in porosity, the __________ of the refractories decreases.

    • Options
    • A. strength
    • B. thermal conductivity
    • C. spalling resistance
    • D. none of these
    • Discuss
    • 8. An ideal refractory should have high

    • Options
    • A. spalling rate
    • B. fusion point
    • C. shrinkage ability
    • D. none of these
    • Discuss
    • 9. Highest melting (m.p = 3070°C) oxide refractory is

    • Options
    • A. alumina
    • B. thoria
    • C. zirconia
    • D. magnesia
    • Discuss
    • 10. SiO2 percentage in firebrick is about

    • Options
    • A. 35-40
    • B. 55-60
    • C. 80-85
    • D. >94
    • Discuss


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