Refractory Technology Maximum water percentage in refractory mix meant for hand moulding may be as high as __________ percent. 7-12 2-3 14-20 5-7 7-12 2-3 14-20 5-7 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Highest melting (m.p = 3070°C) oxide refractory is Magnesia Zirconia Thoria Alumina Magnesia Zirconia Thoria Alumina ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Silica refractories 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 All of these Can not be used in the dome of hot blast stoves Crack when subjected to sudden change of temperature ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology SiO₂ percentage in firebrick is about >94 80-85 55-60 35-40 >94 80-85 55-60 35-40 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Fusion point of a basic refractory material is Increased by the addition of acid oxides Not affected by the addition of acid oxides Reduced by the addition of acid oxides Always less than 1000°C Increased by the addition of acid oxides Not affected by the addition of acid oxides Reduced by the addition of acid oxides Always less than 1000°C ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Semi-silica bricks compared to silica bricks have Both A & B Less fusion point Neither A nor B Better spalling resistance Both A & B Less fusion point Neither A nor B Better spalling resistance ANSWER DOWNLOAD EXAMIANS APP
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