Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory_________________?

A. Silica
B. Fireclay
C. Magnesite
D. Zirconia

A. Quartz
B. Cristobalite
C. Tridymite
D. None of these

A. Subjected to temperature fluctuation
B. Required to resist corrosive basic slag
C. Subjected to high load
D. None of these

A. Reduced by the addition of acid oxides
B. Increased by the addition of acid oxides
C. Not affected by the addition of acid oxides
D. Always less than 1000°C

A. Increases
B. Decreases
C. Remain constant
D. May increase or decrease; depends on its alumina content

A. Stable form of silica upto 870°C
B. Converted to Tridymite on firing between 870 to 1470°C
C. Transformed to Cristobalite on heating above 1470°C
D. All A., B. and C.