1. purpose of flux in blast furnace A. bring down the softening point of the gangue materials B. reduce the viscosity of the slag C. to maintain proper basicity D. all of these Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
2. High top pressure in the blast furnace A. decreases the time of contact between gas and solid B. increases the time of contact between gas and solid C. increases fuel consumption D. increases the rate of solution loss reaction Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
3. Dephosphorisation of molten pig iron is favoured by A. oxidising and basic slag B. reducing and basic slag C. high activity co-efficient of phosphorous in metal D. oxidising and neutral slag Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
4. High top pressure in a blast furnace operation A. favours the solution loss reaction B. suppresses the solution loss reaction C. decreases gas-solid contact time D. increases coke rate Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
5. The zone where the entire charge is in semi-solid or in softened condition except coke inside the BF is called . . . . . . . . zone A. stagnant coke zone B. active coke zone C. cohesive zone D. Tuyere zone Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
6. The primary source of heat in cupola melting is provided by the reaction: A. C + O2 ⟶ CO2 B. C + H2O ⟶ CO2 + H2 C. C + C2O ⟶ 2CO D. CaCO3 ⟶ CaO + CO2 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
7. External desiliconisation of hot metal is carried out in the steel plant located at A. Rourkela B. Durgapur C. Bokaro D. Bhilai Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
8. Humidification of the blast in the iron blast furnace leads to A. lowering of the raceway temperature B. increase in the raceway temperature C. difficulty in pulverised coal injection D. decrease of oxygen content in the hot metal Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
9. High top pressure in blast furnace A. increases the silicon content in the hot metal B. increases the sulfur content in the hot metal C. increases the phosphorous content in the hot metal D. increases the manganese content in the hot metal Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
10. The deadman's zone in the blast furnace consists of A. closely packed central columm of coke, limestone and iron ore B. gases only C. closely packed central column of coke only D. column of hot metal and slag Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
