A. Increases
B. Decreases
C. Remain same
D. May increase or decrease
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 in firebricks, its fusion point (refractoriness) ?
A. Decreases linearly
B. Remains unchanged
C. Increases
D. Decreases - 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 - 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 - 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 - 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. - 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. - 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
