In continuous casting of steel, the mould is subjected to vertical oscillations in order to
A. alloy easy flotation of inclusion
B. ensure good casting homogeneity
C. increase the heat transfer rate from the steel to the mould
D. prevent the skin sticking to the mould
Answer: Option D
Identify the incorrect statement with reference to L.D. steel making
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
The oxidising power of a steel making slag is dependent on the concentration of
A. CaO, because Ca2+ ions are oxidising to the elements
B. CaO, because O2- ions are oxidising to the elements
C. FeO, because Fe2+ ions are oxidising to the elements
D. FeO, because O2- ions are oxidising to the elements
Inclusion free steel are known as
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
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