Refractory Technology
Magnesite chrome refractories

Have very low thermal co-efficient of expansion
Have very low (50 kg/cm² ) cold crushing strength (C.C.S.), and can not be used in metalcase form
Are not at all resistant to the corrosive action of iron oxide
Have better spalling resistance than chrome magnesite refractories

ANSWER DOWNLOAD EXAMIANS APP

Refractory Technology
Quartz is

Transformed to crystoballite on heating above 1470°C
Stable form of silica upto 870°C
Converted to tridymite on firing between 870 to 1470°C
All of these

ANSWER DOWNLOAD EXAMIANS APP