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

Related Mcqs:

1. Silicon carbide refractories have very low ___________________?

   A. Refractoriness (< 1700°C) B. Thermal conductivity C. Resistance to thermal shock D. None of these...

2. 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...

3. Silicon carbide refractories are used in the _____________?

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

4. Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as _____________ percent?

   A. 55 B. 70 C. 80 D. 90...

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

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

6. Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of______________?

   A. Segar cones B. Muffles for muffle furnaces C. Insulating bricks D. Crucibles used for melting of high purity metals...

7. Insulating refractories should have_______________?

   A. High porosity B. Low thermal conductivity C. Both A. and B. D. Neither A. not B....

8. Pyrometric cone equivalent (PCE) value (Segar cone) of ‘Superduty refractories’ is more than 33 which corresponds to a temperature of _____________ °C?

   A. 1520 B. 1630 C. 1670 D. 1730...

9. Magnesite refractories are used for the construction of those furnaces, which are________________?

   A. Not required to resist the corrosive action of basic slag B. Not subjected to fluctuation in temperature C. Used for raising & maintaining high temperature D. Both B. and C....

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...