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  • Question
  • 'Spinel', a refractory mineral is chemically represented as


  • Options
  • A. MgAl2O4
  • B. MgAl2O3
  • C. MgSO4
  • D. MgAl2O3.2H2O

  • Correct Answer
  • MgAl2O4 


  • Refractory Technology problems


    Search Results


    • 1. 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
    • 2. 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
    • 3. Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as __________ percent.

    • Options
    • A. 55
    • B. 70
    • C. 80
    • D. 90
    • Discuss
    • 4. Which form of silica has the highest specific gravity?

    • Options
    • A. Quartz
    • B. Cristobalite
    • C. Tridymite
    • D. All have the same specific gravity
    • Discuss
    • 5. Which is an acidic refractory?

    • Options
    • A. Magnesite
    • B. Dolomite
    • C. Fireclay
    • D. Chrome magnesite
    • Discuss
    • 6. 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
    • 7. Which brick undergoes maximum shrinkage on drying?

    • Options
    • A. Tar bonded dolomite bricks
    • B. Fireclay bricks
    • C. Magnesite bricks
    • D. Chromite bricks
    • Discuss
    • 8. 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.
    • Discuss
    • 9. Bauxite calcining rotary kilns are lined with __________ bricks.

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

    • Options
    • A. High alumina
    • B. Fireclay
    • C. Thoria
    • D. Silicon carbide
    • Discuss


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