In a steel pouring ladle, the distance between the top of the ladle and the surface of the contents of the ladle is called

A. The temperature of L.D. furnace is maintained at around 1600°C B. The basicity of slag is maintained at around unity C. Dephosphorisation and decarburisation should proceed simultaneously D. High silicon hot metal may lead to sloping

A. CaO, because Ca²⁺ ions are oxidising to the elements B. CaO, because O^2- ions are oxidising to the elements C. FeO, because Fe²⁺ ions are oxidising to the elements D. FeO, because O^2- ions are oxidising to the elements

A. Plain carbon steel B. Clean steel C. Alloy steel D. None of these

A. a is false but r is true B. a is true but r is false C. a is true and r is also true, but r is not the reason for a D. a is true and r is also true, and r is the reason for a