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.
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Related Mcqs:
- Maximum alumina content in high alumina refractory can be as high as _____________ percent?
- A. 30 B. 50 C. 70 D. 90...
- 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...
- With increase in the alumina content, the refractoriness of high alumina refractories_______________?
- A. Increases B. Decreases C. Remain same D. May increase or decrease...
- 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...
- Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the_________________?
- A. Washing action of metal B. Corrosion by layer of slag C. Both A. & B. D. Neither A. nor B....
- Chemically, mullite refractories is____________________?
- A. 3Al2O3.2SiO2 B. Al2O3 C. ZrSO4 D. ThO2...
- Mullite is chemically represented by_________________?
- A. Al2O3. 2SiO2 B. 3Al2O3. 2SiO2 C. Al2O3. SiO2 D. 2Al2O3. 3SiO2...
- 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....
- Which is not a high alumina refractory ?
- A. Mullite B. Corundum C. Bauxite D. Dolomite...
- 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...
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