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  • Question
  • 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)

  • Correct Answer
  • crack when subjected to sudden change of temperature. 


  • Refractory Technology problems


    Search Results


    • 1. Which of the following is not a neutral refractory?

    • Options
    • A. Silicon carbide
    • B. Magnesite
    • C. Chromite
    • D. Graphite
    • Discuss
    • 2. Cold crushing strength of ordinary fireclay brick is about 950 kg/cm2 . On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as __________ kg/cm2 .

    • Options
    • A. 450
    • B. 250
    • C. 150
    • D. 65
    • Discuss
    • 3. silicon carbide refractories have very low

    • Options
    • A. refractoriness (< 1700°C).
    • B. thermal conductivity.
    • C. resistance to thermal shock.
    • D. none of these.
    • Discuss
    • 4. Nuclides having the same atomic numbers are termed as

    • Options
    • A. isotopes
    • B. isomers
    • C. isotones
    • D. isobars
    • Discuss
    • 5. Atoms with same number of neutrons, but different number of nucleons are called

    • Options
    • A. isotones
    • B. isobars
    • C. isotopes
    • D. isoters
    • Discuss
    • 6. With increase in the alumina content in firebricks, its fusion point (refractoriness)

    • Options
    • A. decreases linearly
    • B. remains unchanged
    • C. increases
    • D. decreases
    • Discuss
    • 7. Which is not an alumino-silicate refractory?

    • Options
    • A. Fireclay bricks.
    • B. Mullite bricks.
    • C. Tar dolomite bricks.
    • D. High alumina bricks.
    • Discuss
    • 8. 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
    • 9. __________ nozzles are used in continuous casting of steel,

    • Options
    • A. Zircon
    • B. Thoria
    • C. Carborundum
    • D. Beryllia
    • Discuss
    • 10. Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).

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


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