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  • Question
  • Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).


  • Options
  • A. fireclay
  • B. carborundum
  • C. graphite
  • D. chromite

  • Correct Answer
  • graphite 


  • Refractory Technology problems


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    • 1. __________ nozzles are used in continuous casting of steel,

    • Options
    • A. Zircon
    • B. Thoria
    • C. Carborundum
    • D. Beryllia
    • Discuss
    • 2. Which is required in an insulating refractory?

    • Options
    • A. High thermal conductivity
    • B. Low porosity
    • C. Both (a) and (b)
    • D. Neither (a) nor (b)
    • Discuss
    • 3. Which is not an alumino-silicate refractory?

    • Options
    • A. Fireclay bricks.
    • B. Mullite bricks.
    • C. Tar dolomite bricks.
    • D. High alumina bricks.
    • Discuss
    • 4. With increase in the alumina content in firebricks, its fusion point (refractoriness)

    • Options
    • A. decreases linearly
    • B. remains unchanged
    • C. increases
    • D. decreases
    • Discuss
    • 5. Silica refractories

    • Options
    • A. crack when subjected to sudden change of temperature.
    • B. can not be used in the dome of hot blast stoves.
    • C. have lower thermal conductivity than fireclay bricks.
    • D. all (a), (b) and (c)
    • Discuss
    • 6. Which is the most stable crystalline form of silica at room temperature?

    • Options
    • A. Quartz
    • B. Cristobalite
    • C. Tridymite
    • D. None of these
    • Discuss
    • 7. Which of the following is not an acidic refractory?

    • Options
    • A. Silica bricks
    • B. Fireclay bricks
    • C. Bauxite bricks
    • D. Magnesia bricks
    • Discuss
    • 8. Fireclay refractories have

    • Options
    • A. low co-efficient of thermal expansion.
    • B. poor thermal spalling resistance.
    • C. tendency to expand unduly high during firing.
    • D. very high cost.
    • Discuss
    • 9. 'Super refractories' are made from pure

    • Options
    • A. carbides
    • B. oxides
    • C. borides
    • D. nitrides
    • Discuss
    • 10. Chromite refractories are

    • Options
    • A. acidic refractory.
    • B. neutral refractory.
    • C. basic refractory.
    • D. fired at a temperature of 600°C only.
    • Discuss


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