A. Crushing strength
B. Resistance to slag attack
C. Both A. and B.
D. Neither A. nor B.
Related Mcqs:
- An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture ?
A. Cork
B. Saw dust
C. Sand
D. Chemically prepared foam - Capacity of a refractory brick to withstand-sudden changes in temperature is denoted by the property called_________________?
A. Spalling resistance
B. Refractoriness
C. Refractoriness under load (RUL)
D. None of these - Thermal diffusivity of a refractory brick is high, when its ______________ is high?
A. Density
B. Specific heat
C. Thermal conductivity
D. None of these - Silica bricks are never used for lining the_________________?
A. Beehive coke ovens
B. By-product coke ovens
C. Dome of blast furnace stoves
D. Roof of open hearth furnace - Which form of silica has the highest specific gravity ?
A. Quartz
B. Cristobalite
C. Tridymite
D. All have the same specific gravity - Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of ______________ °C?
A. 770
B. 570
C. 270
D. 70 - Which is not an acidic refractory ?
A. Silica
B. Fireclay
C. High alumina refractory
D. Carbon black - Thermal conductivity of refractory bricks____________________?
A. Increases with decrease in porosity
B. Decreases with decreases in porosity
C. Is independent of its porosity and is maximum for insulating bricks
D. Increases with the amount of air entrapped in pores - Refractory bricks with lower permeability is produced by using _________________?
A. Higher firing temperature
B. Higher moulding pressure
C. Finer grog size
D. All A., B. and C. - Maximum alumina content in high alumina refractory can be as high as ____________ percent?
A. 30
B. 50
C. 70
D. 90
