Fusion temperature of pure silica (SiO2) is _______________ °C?

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. SiO2 percentage in firebrick is about____________________?

   A. 35-40 B. 55-60 C. 80-85 D. > 94...

3. Sillimanite (Al2O3.SiO2) refractory, which is a neutral refractory, is not used in________________?

   A. Pottery furnace B. Glass melting furnace C. Crucibles D. Gas retorts...

4. Which one contains minimum percentage of SiO2 ?

   A. Firebrick B. Sillimanite C. Semi-silica D. Aluminous firebrick...

5. Refractoriness/fusion points of ‘Superduty’ refractories is _______________ °C?

   A. 1520-1630 B. 1630-1670 C. > 1730 D. > 2000...

6. Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for _____________ bricks?

   A. Fireclay B. Silica C. Dolomite D. Very low alumina...

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

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

8. 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...

9. Refractoriness of a typical silica brick corresponds to Segar cone number, ’32’, which is equivalent to a temperature of _____________ °C?

   A. 1380 B. 1520 C. 1710 D. 1915...

10. Pure oxide refractories are generally monocrystalline in nature and are self bonded _______________ bricks are generally used as moderator in nuclear reactors?

    A. Beryllia B. Carborundum C. Corundum D. Thoria...