Refractoriness/fusion points of ‘Superduty’ refractories is _______________ °C?

Related Mcqs:

1. 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...

2. PCE value (Segar cone) of Superduty refractories is more than 33, which is equivalent to a temperature of ____________ °C?

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

3. Presence of MgO in alumino-silicate refractories _______________ its refractoriness?

   A. Increases B. Lowers C. Does not affect D. Either A. or B.; depends on its quantity...

4. With increase in the alumina content in firebricks, its fusion point (refractoriness) ?

   A. Decreases linearly B. Remains unchanged C. Increases D. Decreases...

5. Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for _____________ bricks?

   A. Fireclay B. Silica C. Dolomite D. Very low alumina...

6. 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...

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

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

8. Fusion temperature of pure silica (SiO2) is _______________ °C?

   A. 1350 B. 1715 C. 2570 D. 2800...

9. Refractoriness under load (RUL) is the most important property for the refractory bricks_________________?

   A. At the hearth bottom of the furnace on which stock is placed B. Used for furnace insulation C. Used in the roof of the furnace D. None of these...

10. . Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm2) is ______________ °C?

    A. 500 B. 1000 C. >1350 D. >2000...