High alumina refractories are used in the ___________________?

Related Mcqs:

1. 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?

   A. 55 B. 70 C. 80 D. 90...

2. Maximum alumina content in high alumina refractory can be as high as _____________ percent?

   A. 30 B. 50 C. 70 D. 90...

3. With increase in the alumina content, the refractoriness of high alumina refractories_______________?

   A. Increases B. Decreases C. Remain same D. May increase or decrease...

4. With increasing alumina content, the fusion point of high alumina refractories__________________?

   A. Increases B. Decreases C. Remain constant D. May increase or decrease; depends on its alumina content...

5. Faster rate of drying of moulded refractories results in high _____________ of refractories?

   A. Green strength B. Voids C. Shrinkage D. Both B. and C....

6. Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except ?

   A. Cost B. Electrical conductivity C. Thermal conductivity D. Fusion point...

7. Hot face insulating linings of high purity alumina fused mullite are used, where_________________?

   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....

8. Which is not a high alumina refractory ?

   A. Mullite B. Corundum C. Bauxite D. Dolomite...

9. Which of the following is not a high alumina refractory material ?

   A. Kyanite B. Sillimanite C. Diaspore D. Periclase...

10. High alumina refractory compared to fireclay bricks have____________________?

    A. Less load bearing capacity B. Less resistance to slag attack C. Low refractoriness D. High resistance to thermal shock and creep...