A. Increases
B. Decreases
C. Remain same
D. May increase or decrease
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Related Mcqs:
- An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture ?
- A. Cork B. Saw dust C. Sand D. Chemically prepared foam...
- In panel test for spalling resistance, the average face temperature of panel assembly is maintained at _____________ °C for 24 hours?
- A. 700 B. 1000 C. 1600 D. 2000...
- Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of ______________ °C?
- A. 770 B. 570 C. 270 D. 70...
- Fireclay refractories___________________?
- A. Are not resistant to the action of basic slags B. Combine with salts (e.g. chlorides sulphates etc.) & bases (e.g. lime, magnesia etc.) forming fusible aluminates silicates etc C. Shrink during firing D. All A., B. and C....
- Fireclay bricks is not used for lining the_______________?
- A. Cupola B. Gas producer C. Bottom of hot metal mixer D. Roof of open hearth furnace...
- Fireclay bricks are not used in the_________________?
- A. Blast furnace B. Hot blast stove C. Cupola D. Wall of coke oven...
- 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...
- Fireclay bricks are used in the______________?
- A. Coke ovens regenerator B. Outer lining of L.D. converter C. Hearth bottom of blast furnace D. Coke oven walls...
- Refractory bricks having lower porosity have _____________________?
- A. High insulating properties B. Low heat capacity C. Low thermal conductivity D. Greater strength...
- High porosity refractory bricks have________________?
- A. Poor resistance to the penetration of molten slag, metal & flue gases B. Poor heat conductivity & low strength C. Better thermal spalling resistance D. All A., B. and C....
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