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

Related Mcqs:

1. Which of the following bricks has the most close values of RUL and PCE ?

   A. Silica bricks
   B. Fireclay bricks
   C. High alumina bricks
   D. Tar dolomite bricks

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

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

3. 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

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

   A. 1520-1630
   B. 1630-1670
   C. > 1730
   D. > 2000

6. 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

7. Which of the following impurities reduces the refractoriness of magnesite bricks ?

   A. Al2O3
   B. CaO
   C. SiO2
   D. All A., B. & C.

8. High refractoriness of refractory bricks means, that it has a________________?

   A. High spalling resistance
   B. Low spalling resistance
   C. High resistance to fusion
   D. Low porosity

9. 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

10. Refractoriness of a typical silica brick corresponds to Segar cone number, ’32’, which is equivalent to a temperature of _____________ °C?

    A. 1380
    B. 1520
    C. 1710
    D. 1915