A. Thermal spalling
B. Slag attack
C. Fusion under load
D. CO attack
Related Mcqs:
- Faster rate of drying of moulded refractories results in high _____________ of refractories?
A. Green strength
B. Voids
C. Shrinkage
D. Both B. and C. - Magnesite refractories have low resistance to___________________?
A. Attack by basic slag
B. Abrasion
C. Disintegration on sudden change of temperature
D. Both B. and C. - Which of the following consumes the maximum tonnage of refractories annually in an integrated steel plant ?
A. Soaking pits
B. Reheating furnace
C. L.D. converter
D. Rotary lime kiln - Carbon refractories have very high __________________?
A. Wetting characteristics
B. Refractoriness
C. Thermal conductivity
D. Both B. and C. - Refractories are dried in the _______________?
A. Rotary kilns
B. Tunnel kilns
C. Sun
D. None of these - Refractoriness/fusion points of ‘Superduty’ refractories is _______________ °C?
A. 1520-1630
B. 1630-1670
C. > 1730
D. > 2000 - Chemically, mullite refractories is____________________?
A. 3Al2O3.2SiO2
B. Al2O3
C. ZrSO4
D. ThO2 - Silica refractories are not used in _________________?
A. Coke oven walls
B. Beehive coke ovens
C. Dome and upper portion of B.F. stoves
D. Open hearth furnace roof - With decrease in porosity, the ______________ of the refractories decreases?
A. Strength
B. Thermal conductivity
C. Spalling resistance
D. None of these - 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
