With increase in the density of silica refractories, 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. Si percentage in silica refractories used in the walls of coke oven is about______________________?

   A. 45 B. 60 C. 80 D. 95...

3. Silica refractories are not used in _________________?

   A. Coke oven walls B. Beehive coke ovens C. Dome and upper portion of B.F. stoves D. Open hearth furnace roof...

4. Faster rate of drying of moulded refractories results in high _____________ of refractories?

   A. Green strength B. Voids C. Shrinkage D. Both B. and C....

5. Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, because of its_______________?

   A. Non-wetting characteristic B. High thermal conductivity C. High crushing strength D. None of these...

6. Conversion of silica mineral to Cristobalite is accompanied by reduction in its ____________________?

   A. Volume B. Specific gravity C. Both A. & B. D. Neither A. nor B....

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

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

8. An indication of degree of firing in silica brick is its____________________?

   A. Specific gravity B. Fusion point C. RUL D. None of these...

9. 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....

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

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