Spalling of a refractory means its____________________?

Related Mcqs:

1. 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...

2. To resist spalling tendency, a refractory should have________________?

   A. Greater diffusivity B. Low specific heat C. Low thermal co-efficient of expansion D. All A., B. and C....

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. Thermal spalling mainly occurs during _____________ of furnaces?

   A. Cooling down B. Warming up C. Both A. & B. D. Neither A. nor B....

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

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

6. 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...

7. Spalling tendency of refractories is reduced by increasing its_________________?

   A. Porosity B. Specific gravity C. Thermal conductivity D. Strength...

8. 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...

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

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

10. High refractoriness of refractory bricks means, that it has a________________?

    A. High spalling resistance B. Low spalling resistance C. High resistance to fusion D. Low porosity...