Carbon refractories are exclusively used in the_________________?

Related Mcqs:

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

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

2. Carbon refractories have very high __________________?

   A. Wetting characteristics B. Refractoriness C. Thermal conductivity D. Both B. and C....

3. Carbon bricks are not used in the lining of the_________________?

   A. Combustion chamber of blast furnace stoves B. Electric furnaces C. Highly chemical resistant equipments D. Blast furnace hearth...

4. Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns ?

   A. 1800 B. 2200 C. 2400 D. 2700...

5. Machine moulding of dry mixture of refractories requires a pressure of the order of _____________ kg/cm2?

   A. 10 B. 100 C. 500 D. 1000...

6. With increase in the density of silica refractories, its_______________?

   A. Resistance to slag attack increases B. Spalling resistance reduces C. Both A. and B. D. Neither A. nor B....

7. Except _____________, all other refractories are bad conductors of electricity (i.e, have low electrical conductivity)?

   A. Fireclay B. Carborundum C. Graphite D. Chromite...

8. Panel test determines the _____________ of refractories?

   A. Fusion point B. Spalling resistance C. Slag penetration resistance D. Refractoriness under load (RUL)...

9. Furnace atmosphere for softening temperature determination of refractories (in which Seger Cones are placed) should be __________________?

   A. Oxidising B. Neutral C. Either A. or B. D. Neither A. nor B....

10. Fireclay refractories have __________________?

    A. Low co-efficient of thermal expansion B. Poor thermal spalling resistance C. Tendency to expand unduly high during firing D. Very high cost...