logo

CuriousTab

CuriousTab

Discussion


Home Chemical Engineering Refractory Technology Comments

  • Question
  • 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

  • Correct Answer
  • 90 


  • Refractory Technology problems


    Search Results


    • 1. Which form of silica has the highest specific gravity?

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

    • Options
    • A. Magnesite
    • B. Dolomite
    • C. Fireclay
    • D. Chrome magnesite
    • Discuss
    • 3. Which is not an acidic refractory?

    • Options
    • A. Silica
    • B. Fireclay
    • C. High alumina refractory
    • D. Carbon black
    • Discuss
    • 4. Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with __________ bricks.

    • Options
    • A. bakelite impregnated or fused periclase
    • B. silica
    • C. semi-silica
    • D. fireclay
    • Discuss
    • 5. Thermal conductivity of refractory bricks

    • Options
    • A. increases with decrease in porosity.
    • B. decreases with decreases in porosity.
    • C. is independent of its porosity and is maximum for insulating bricks.
    • D. increases with the amount of air entrapped in pores.
    • Discuss
    • 6. 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
    • 7. 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
    • 8. 'Spinel', a refractory mineral is chemically represented as

    • Options
    • A. MgAl2O4
    • B. MgAl2O3
    • C. MgSO4
    • D. MgAl2O3.2H2O
    • Discuss
    • 9. 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
    • 10. Which brick undergoes maximum shrinkage on drying?

    • Options
    • A. Tar bonded dolomite bricks
    • B. Fireclay bricks
    • C. Magnesite bricks
    • D. Chromite bricks
    • Discuss


    Comments

    There are no comments.

Enter a new Comment