Semi-silica bricks compared to silica bricks have_______________?

Related Mcqs:

1. 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...

2. Porosity of silica bricks varies from ______________ percent?

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

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

   A. Very high thermal conductivity B. High co-efficient of expansion upto this temperature C. High thermal diffusivity D. Low refractoriness...

4. 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....

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

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

6. 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...

7. Insulating refractories should have_______________?

   A. High porosity B. Low thermal conductivity C. Both A. and B. D. Neither A. not B....

8. 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...

9. Which is the most stable crystalline form of silica at room temperature ?

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

10. Which is the stable form of silica between 1470°C and the melting point 1713°C ?

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