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Refractory Technology problems

  • 1. Tar dolomite bricks are used in the

  • Options
  • A. basic Bessemer converter
  • B. basic open hearth furnace
  • C. electric furnaces
  • D. all (a), (b) and (c)
    • Discuss
  • 2. Conversion of silica mineral to cristobalite is accompanied by reduction in its

  • Options
  • A. volume
  • B. specific gravity
  • C. both (a) & (b)
  • D. neither (a) nor (b)
    • Discuss
  • 3. Chrome magnesite is not used in the

  • Options
  • A. inner lining of L.D. converter.
  • B. aluminium melting furnaces.
  • C. wear out lining of steel melting furnaces.
  • D. all (a), and (b) and (c)
    • Discuss
  • 4. Sillimanite is a __________ refractory.

  • Options
  • A. basic
  • B. neutral
  • C. high alumina
  • D. insulating
    • Discuss
  • 5. The main raw material for manufacture of silicon carbide refractories is

  • Options
  • A. corrundum
  • B. carborundum
  • C. bauxite
  • D. periclase
    • Discuss
  • 6. High refractorinness of refractory bricks means, that it has a

  • Options
  • A. high spalling resistance.
  • B. low spalling resistance.
  • C. high resistance to fusion.
  • D. low porosity.
    • Discuss
  • 7. Which furnace consumes maximum refractory annually in an integrated steel plant?

  • Options
  • A. Soaking pit
  • B. Blastfurnace
  • C. L.D. converter
  • D. Coke ovens
    • Discuss
  • 8. Carbon refractories have very high

  • Options
  • A. wetting characteristics
  • B. refractoriness
  • C. thermal conductivity
  • D. both (b) and (c)
    • Discuss
  • 9. Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns.

  • Options
  • A. 1800
  • B. 2200
  • C. 2400
  • D. 2700
    • Discuss
  • 10. Chrome magnesite bricks are

  • Options
  • A. acidic in nature.
  • B. neutral in nature.
  • C. having higher RUL than silica bricks.
  • D. made by mixing 30% chromite and 70% periclase.
    • Discuss

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