Building Materials Proper amount of entrained air in concrete results in(i) Better workability(ii) Better resistance to freezing and thawing(iii) Lesser workability(iv) Less resistance to freezing and thawing (i) and (iv) (iii) and (iv) (ii) and (iii) (i) and (ii) (i) and (iv) (iii) and (iv) (ii) and (iii) (i) and (ii) ANSWER DOWNLOAD EXAMIANS APP
Building Materials Asbestos Is composed of hydrous silicates of calcium and magnesium (CaSiO3, 3MgSiO3) Contains iron oxide and alumina Is a natural fibrous mineral substance All of these Is composed of hydrous silicates of calcium and magnesium (CaSiO3, 3MgSiO3) Contains iron oxide and alumina Is a natural fibrous mineral substance All of these ANSWER DOWNLOAD EXAMIANS APP
Building Materials Pig iron made from haematite ores free from sulphur, phosphorus and copper, is known as Bessemer pig White or forge pig Grey or foundry pig Mottled pig Bessemer pig White or forge pig Grey or foundry pig Mottled pig ANSWER DOWNLOAD EXAMIANS APP
Building Materials The process of decarbonising the pig iron completely and then adding proper percentage of carbon for manufacturing steel, is called Cementation process Bessemer process Crucible process Open hearth process Cementation process Bessemer process Crucible process Open hearth process ANSWER DOWNLOAD EXAMIANS APP
Building Materials The slag which floats on the surface of the molten iron generally contains Silica (SiO2) 35% Alumina (Al2O3) 12% and MgO, CaSO4, KMnO2 and FeO 8% Lime (CaO) 45% All listed here Silica (SiO2) 35% Alumina (Al2O3) 12% and MgO, CaSO4, KMnO2 and FeO 8% Lime (CaO) 45% All listed here ANSWER DOWNLOAD EXAMIANS APP
Building Materials Cast iron May contain 2 to 5 per cent of carbon with other impurities All listed here Is obtained by purifying pig iron Is manufactured in required shapes May contain 2 to 5 per cent of carbon with other impurities All listed here Is obtained by purifying pig iron Is manufactured in required shapes ANSWER DOWNLOAD EXAMIANS APP
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