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  • Question
  • Si percentage in silica refractories used in the walls of coke oven is about


  • Options
  • A. 45
  • B. 60
  • C. 80
  • D. 95

  • Correct Answer
  • 95 


  • Refractory Technology problems


    Search Results


    • 1. 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
    • 2. Fireclay bricks are never used in the

    • Options
    • A. beehive oven
    • B. coke oven walls
    • C. zinc roaster
    • D. lead blast furnace
    • Discuss
    • 3. 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
    • 4. 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
    • 5. 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
    • 6. Refractoriness under load (RUL) is the most important property for the refractory bricks

    • Options
    • A. at the hearth bottom of the furnace on which stock is placed.
    • B. used for furnace insulation.
    • C. used in the roof of the furnace.
    • D. none of these.
    • Discuss
    • 7. Zircon refractories have

    • Options
    • A. low co-efficient of expansion.
    • B. high RUL (1600°C) and refractoriness (> 2000°C).
    • C. high spalling resistance.
    • D. all (a), (b) and (c).
    • Discuss
    • 8. Electrical resistor bars are made of

    • Options
    • A. silicon carbide
    • B. alumina
    • C. zirconia
    • D. graphite
    • Discuss
    • 9. Maximum safe working temperature for fireclay bricks is about __________ °C.

    • Options
    • A. 1150
    • B. 1300
    • C. 1450
    • D. 1550
    • Discuss
    • 10. 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


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