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

Related Mcqs:

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

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

2. 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...

3. With increase in the alumina content in firebricks, its fusion point (refractoriness) ?

   A. Decreases linearly B. Remains unchanged C. Increases D. Decreases...

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. Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns ?

   A. 1800 B. 2200 C. 2400 D. 2700...

6. High refractoriness of refractory bricks means, that it has a________________?

   A. High spalling resistance B. Low spalling resistance C. High resistance to fusion D. Low porosity...

7. High alumina refractories are used in the ___________________?

   A. Dome of blast furnace stoves B. Electric arc furnace roof C. Glass melting furnaces D. All A., B. and C....

8. 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....

9. Which is not a high alumina refractory ?

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

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...