Silica bricks have low spalling resistance below 600°C, due to its________________?

Related Mcqs:

1. Semi-silica bricks compared to silica bricks have_______________?

   A. Less fusion point B. Better spalling resistance C. Both A. and B. D. Neither A. not B....

2. With increase in the porosity, thermal spalling resistance of fireclay brick___________________?

   A. Increases B. Decreases C. Remain same D. May increase or decrease...

3. Spalling resistance of a refractory cannot be increased by ____________________?

   A. Increasing its porosity B. Using a coarser grog during its manufacture C. Decreasing its thermal co-efficient of expansion D. Making it denser...

4. 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...

5. Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material ?

   A. Aluminium phosphate B. Water C. Lime D. Plaster of Paris...

6. Porosity of silica bricks varies from ______________ percent?

   A. 5 to 10 B. 20 to 30 C. 45 to 60 D. 60 to 75...

7. Use of higher percentage of lime for bonding silica bricks, reduces their__________________?

   A. Strength B. Abrasion resistance C. Both A. & B. D. Neither A. nor B....

8. The maximum linear expansion of silica bricks during firing is about ______________ percent?

   A. 0.5 B. 1 C. 2 D. 3.5...

9. Silica bricks are never used for lining the____________________?

   A. Beehive coke ovens B. By-product coke ovens C. Dome of blast furnace stoves D. Roof of open hearth furnace...

10. Which is the stable form of silica below 870°C ?

    A. Tridymite B. Cristobalite C. Quartz D. None of these...