Silicon carbide refractories have very low ___________________?

Related Mcqs:

1. 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...

2. Silicon carbide refractories are used in the _____________?

   A. Muffle furnace B. Zinc smelting furnace C. Ceramic recuperators D. All A., B. and C....

3. The main raw material for manufacture of silicon carbide refractories is_________________?

   A. Corundum B. Carborundum C. Bauxite D. Periclase...

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

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

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

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

6. Magnesite refractories have low resistance to___________________?

   A. Attack by basic slag B. Abrasion C. Disintegration on sudden change of temperature D. Both B. and C....

7. High alumina refractories are used in the ___________________?

   A. Dome of blast furnace stoves B. Electric arc furnace roof C. Glass melting furnaces D. All A., B. and C....

8. Segar cones are used for the determination of ____________ of refractories?

   A. Softening temperature B. Spalling resistance C. Electrical conductivity D. Resistance to slag attack...

9. Zircon refractories have__________________?

   A. Low co-efficient of expansion B. High RUL (1600°C) and refractoriness (> 2000°C) C. High spalling resistance D. All A., B. and C....

10. The largest consumer of refractories is the _______________ industry?

    A. Cement B. Metallurgical C. Fertiliser D. Power...