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.Management Sciences
A. Has high fusion temperature (> 3000°C) but poor resistance to thermal shock
B. Has high resistance to basic slags
C. Which is expensive & radioactive, is used in crucibles for melting high purity metals
D. All A., B. and C.
Related Mcqs:
- 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...
- Chrome magnesite brick is not used for lining the___________________?
- A. Hearth of soaking pits B. Bottom hearth of reheating furnace C. Coke oven regenerator D. Burning zone of limestone rotary kilns...
- Fireclay bricks are not used in the _________________?
- A. Beehive coke oven B. By-product coke oven walls C. Combustion chamber of B.F. stoves D. Coke oven regenerators...
- Pick out the wrong statement?
- A. Sand & coke is the main raw material for the manufacture of silicon carbide B. Carbon refractories cannot be used in the furnaces operating under reducing conditions C. Mullite can be obtained by the heating of alusite, kyanite or sillimanite D. Silica occurs in nature in all cellular, amorphous or crystalline form...
- ______________ bricks should not be used in oxidising atmosphere?
- A. Tar dolomite B. Carbon C. Silica D. Fireclay...
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