Refractory Technology 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? Chemically prepared foam Sand Saw dust Cork Chemically prepared foam Sand Saw dust Cork ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Which is the most stable crystalline form of silica at room temperature? Cristobalite None of these Quartz Tridymite Cristobalite None of these Quartz Tridymite ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Which is the stable form of silica between 1470°C and the melting point 1713°C ? Tridymite Cristobalite Quartz None of these Tridymite Cristobalite Quartz None of these ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Permeability of bricks is a measure of the Rate at which a fluid will pass through the pores Refractoriness Melting point Expansion during heating Rate at which a fluid will pass through the pores Refractoriness Melting point Expansion during heating ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Cold crushing strength of ordinary fireclay brick is about 950 kg/cm² . On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as __________ kg/cm² . 250 150 65 450 250 150 65 450 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology The main raw material for manufacture of silicon carbide refractories is Bauxite Carborundum Corrundum Periclase Bauxite Carborundum Corrundum Periclase ANSWER DOWNLOAD EXAMIANS APP
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