Refractory Technology Magnesite refractories have low resistance to Attack by basic slag Abrasion Both B and C Disintegration on sudden change of temperature Attack by basic slag Abrasion Both B and C Disintegration on sudden change of temperature ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology RUL of refractories depends on the Presence of impurities like iron & alkali Chemical composition Physical structure All of these Presence of impurities like iron & alkali Chemical composition Physical structure All of these ANSWER DOWNLOAD EXAMIANS APP
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? Cork Sand Chemically prepared foam Saw dust Cork Sand Chemically prepared foam Saw dust ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Permeability of bricks is a measure of the Melting point Rate at which a fluid will pass through the pores Refractoriness Expansion during heating Melting point Rate at which a fluid will pass through the pores Refractoriness Expansion during heating ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Carbon refractories Do not resist temperature fluctuations Do not burn/oxidise, when exposed to air on heating Are not attacked by slags, as they are not wetted by melts Have extremely low thermal & electrical conductivities Do not resist temperature fluctuations Do not burn/oxidise, when exposed to air on heating Are not attacked by slags, as they are not wetted by melts Have extremely low thermal & electrical conductivities 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
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