A. Silica bricks
B. Fireclay bricks
C. High alumina bricks
D. Tar dolomite bricks
Related Mcqs:
- Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for _____________ bricks?
A. Fireclay
B. Silica
C. Dolomite
D. Very low alumina - . Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm2) is ______________ °C?
A. 500
B. 1000
C. >1350
D. >2000 - Semi-silica bricks compared to silica bricks have_______________?
A. Less fusion point
B. Better spalling resistance
C. Both A. and B.
D. Neither A. not B. - 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 - Pyrometric cone equivalent (PCE) of a refractory is the measure of its_________________?
A. Spalling resistance
B. Fusion point
C. Resistance to slag penetration
D. Resistance to carbon monoxide attack - 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 - RUL of refractories depends on the _____________________?
A. Chemical composition
B. Physical structure
C. Presence of impurities like iron & alkali
D. All A., B. and C. - Test piece for determination of RUL of a refractory is heated in a/an____________________?
A. Oxidising atmosphere
B. Reducing atmosphere
C. Electric furnace
D. Neutral atmosphere - 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 - Which of the following impurities reduces the refractoriness of magnesite bricks ?
A. Al2O3
B. CaO
C. SiO2
D. All A., B. & C.
