Refractory Technology Natural silica All of these Transforms to other allotropic forms i.e tridymite and cristoballite involving very high volume changes Is not stable at high temperature Mainly contains quartz All of these Transforms to other allotropic forms i.e tridymite and cristoballite involving very high volume changes Is not stable at high temperature Mainly contains quartz ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Maximum water percentage in refractory mix meant for hand moulding may be as high as __________ percent. 14-20 7-12 5-7 2-3 14-20 7-12 5-7 2-3 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Refractories are dried in the Rotary kilns Tunnel kilns None of these Sun Rotary kilns Tunnel kilns None of these Sun ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Porosity is induced in insulating refractories by adding All of these Calcium phosphate Powdered naphthalene Ammonium chloride/sulphate All of these Calcium phosphate Powdered naphthalene Ammonium chloride/sulphate ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Silica refractories All of these Can not be used in the dome of hot blast stoves Crack when subjected to sudden change of temperature Have lower thermal conductivity than fireclay bricks All of these Can not be used in the dome of hot blast stoves Crack when subjected to sudden change of temperature Have lower thermal conductivity than fireclay bricks ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the Washing action of metal Neither A nor B Both A & B Corrosion by layer of slag Washing action of metal Neither A nor B Both A & B Corrosion by layer of slag ANSWER DOWNLOAD EXAMIANS APP
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