Refractory Technology Spalling tendency of refractories is reduced by increasing its Strength Thermal conductivity Porosity Specific gravity Strength Thermal conductivity Porosity Specific gravity ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Fusion point of a basic refractory material is Always less than 1000°C Increased by the addition of acid oxides Reduced by the addition of acid oxides Not affected by the addition of acid oxides Always less than 1000°C Increased by the addition of acid oxides Reduced by the addition of acid oxides Not affected by the addition of acid oxides ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Magnesite chrome refractories Have very low (50 kg/cm² ) cold crushing strength (C.C.S.), and can not be used in metalcase form Have very low thermal co-efficient of expansion Are not at all resistant to the corrosive action of iron oxide Have better spalling resistance than chrome magnesite refractories Have very low (50 kg/cm² ) cold crushing strength (C.C.S.), and can not be used in metalcase form Have very low thermal co-efficient of expansion 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 Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of __________ percent respectively. 60 and 40 20 and 80 50 and 50 80 and 20 60 and 40 20 and 80 50 and 50 80 and 20 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Refractoriness/fusion points of 'superduty' refractories is __________ °C. > 1730 1520-1630 1630-1670 > 2000 > 1730 1520-1630 1630-1670 > 2000 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Refractory bricks with lower permeability is produced by using All of these Finer grog size Higher moulding pressure Higher firing temperature All of these Finer grog size Higher moulding pressure Higher firing temperature ANSWER DOWNLOAD EXAMIANS APP
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