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

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, 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. Which is not a high alumina refractory ?

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

6. 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...

7. Sillimanite (Al2O3.SiO2) refractory, which is a neutral refractory, is not used in________________?

   A. Pottery furnace B. Glass melting furnace C. Crucibles D. Gas retorts...

8. High thermal conductivity of a refractory material is not important, when it is to be used in the______________________?

   A. Coke oven regenerators B. Muffle furnace C. Blast furnace D. Recuperators...

9. Thermal diffusivity of a refractory brick is high, when its ____________ is high?

   A. Density B. Specific heat C. Thermal conductivity D. None of these...

10. 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....