Silicon carbide refractories are used in the _____________?

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

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

7. 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

8. 10 to 30% magnesite is added to Chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the _____________ of Chromite?

   A. Spalling resistance
   B. Refractoriness
   C. Crushing strength
   D. Resistance to slag

9. Spray test determines the _____________ of refractories?

   A. Resistance to slag penetration
   B. Resistance to CO attack
   C. RUL
   D. Permanent linear change

10. 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