A. Low co-efficient of expansion
B. High RUL (1600°C) and refractoriness (> 2000°C)
C. High spalling resistance
D. All A., B. and C.
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. - Addition of zircon to silica refractory brick improves its_____________________?
A. Crushing strength
B. Resistance to slag attack
C. Both A. and B.
D. Neither A. nor B. - 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 - High alumina refractories are used in the ___________________?
A. Dome of blast furnace stoves
B. Electric arc furnace roof
C. Glass melting furnaces
D. All A., B. and C. - Silicon carbide refractories are used in the _____________?
A. Muffle furnace
B. Zinc smelting furnace
C. Ceramic recuperators
D. All A., B. and C. - Refractories are dried in the _______________?
A. Rotary kilns
B. Tunnel kilns
C. Sun
D. None of these - 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 - 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 - Spalling tendency of refractories is reduced by increasing its_________________?
A. Porosity
B. Specific gravity
C. Thermal conductivity
D. Strength - Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance to__________________?
A. Thermal spalling
B. Slag attack
C. Fusion under load
D. CO attack
