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  • Question
  • Carbon refractories


  • Options
  • A. do not burn/oxidise, when exposed to air on heating.
  • B. are not attacked by slags, as they are not wetted by melts.
  • C. do not resist temperature fluctuations.
  • D. have extremely low thermal & electrical conductivities.

  • Correct Answer
  • are not attacked by slags, as they are not wetted by melts. 


  • Refractory Technology problems


    Search Results


    • 1. Which brick undergoes maximum shrinkage on drying?

    • Options
    • A. Tar bonded dolomite bricks
    • B. Fireclay bricks
    • C. Magnesite bricks
    • D. Chromite bricks
    • Discuss
    • 2. Refractory castables are used for

    • Options
    • A. producing monolithic linings.
    • B. patch work.
    • C. minimising the number of joints in the structure.
    • D. all (a), (b) and (c).
    • Discuss
    • 3. 'Spinel', a refractory mineral is chemically represented as

    • Options
    • A. MgAl2O4
    • B. MgAl2O3
    • C. MgSO4
    • D. MgAl2O3.2H2O
    • Discuss
    • 4. Pyrometric cone equivalent (PCE) of a refractory is the measure of its

    • Options
    • A. spalling resistance.
    • B. fusion point.
    • C. resistance to slag penetration.
    • D. resistance to carbon monoxide attack.
    • Discuss
    • 5. Permeability of bricks is a measure of the

    • Options
    • A. refractoriness.
    • B. melting point.
    • C. rate at which a fluid will pass through the pores.
    • D. expansion during heating.
    • Discuss
    • 6. Bauxite calcining rotary kilns are lined with __________ bricks.

    • Options
    • A. fireclay
    • B. carbon
    • C. 85% alumina
    • D. corundum
    • Discuss
    • 7. __________ bricks are used in the burning zone of a cement rotary kiln.

    • Options
    • A. High alumina
    • B. Fireclay
    • C. Thoria
    • D. Silicon carbide
    • Discuss
    • 8. Magnesite refractories have low resistance to

    • Options
    • A. attack by basic slag.
    • B. abrasion.
    • C. disintegration on sudden change of temperature.
    • D. both (b) and (c).
    • Discuss
    • 9. Hot face insulating linings of high purity alumina fused mullite are used, where

    • Options
    • A. very high temperatures are involved.
    • B. highly reducing conditions are involved.
    • C. presence of iron or silica is harmful.
    • D. all (a), (b) and (c).
    • Discuss
    • 10. Mixing of ground refractory material and water is done in a __________ mill.

    • Options
    • A. pug
    • B. ball
    • C. tube
    • D. rod
    • Discuss


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