Spalling tendency of refractories is reduced by increasing its_________________?

Related Mcqs:

1. Cold crushing strength of refractories depends upon its_________________?

   A. Composition B. Texture C. Firing temperature D. All A., B. and C....

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

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

4. Spalling of a refractory means its____________________?

   A. Softening B. Fracture due to uneven expansion at high temperature C. Resistance to compressive loads D. Resistance to chemical action of gases and molten fluxes...

5. Thermal spalling mainly occurs during _____________ of furnaces?

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

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

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

7. 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...

8. 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...

9. 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...

10. Pyrometric cone equivalent (PCE) of a refractory is the measure of its_________________?

    A. Spalling resistance B. Fusion point C. Resistance to slag penetration D. Resistance to carbon monoxide attack...