This set of Iron Making Multiple Choice Questions & Answers (MCQs) focuses on “Alternative Iron Making Process”.
1. The Solid iron produced by direct reduction of iron ore is popularly known as?
a) Cast iron
b) White iron
c) Mild iron
d) Sponge iron
View Answer
Explanation: Sponge iron is called as the direct reduced iron as the Ore here is directly reduced by non-coking coal. This Sponge iron is used to manufacture wrought iron products. Electric arc Furnaces mainly feed on sponge iron.
2. Which of the following type of iron is used as supplement for the scrap required in EAF?
a) Cast iron
b) Pig iron
c) Direct reduced iron
d) White iron
View Answer
Explanation: Sponge iron is used as supplement for scrap in EAF which is also called as DRI. As in many places the economic factor facilitates DRI over scrap iron. The density factor also favors use of DRI over scrap iron in EAF.
3. In the composite pellet route of Iron making what consolidates to form pellets?
a) Reduced iron and coke
b) Iron ore and non-carbonaceous reductant
c) Iron ore and carbonaceous reductant
d) Reduced iron and sulphur
View Answer
Explanation: Iron ore and carbonaceous reductants like coal/coke are mixed together to form pellets. With the help of binder these are pelletized. For small and medium scale industries iron making through composite pellet is a big asset.
4. Which of the following process is based on Composite-pellet method?
a) Fastmet process
b) Hogans process
c) Corex process
d) Finex process
View Answer
Explanation: In the above process hogans process is completely based on fine type methods. Finex process and Corex process are also not based on composite-pellet method as they follows direct reduction with help of oxygen. In Fastmet process, Reduction is done in Rotary hearth furnace where the composite pellet system is followed.
5. In bath smelting process liquid hot metal is produced by_________
a) Solid state reduction
b) Liquid state reduction
c) Combination of solid state reduction and liquid state reduction
d) Indirect reduction of iron ore
View Answer
Explanation: Solid iron is produced by DRI method where as Liquid iron is produced by the combination of solid state reduction and liquid state reduction. Corex process developed by korf stahl is first commercially successful smelting reduction process. Both solid and liquid state reduction accompanies the production of liquid iron in smelting process.
6. What is purpose of adding binders to green pellets?
a) Increase porosity
b) Increase in size
c) Withstand downstream shock
d) Chemical support
View Answer
Explanation: Addition of binders to pellets make provides mechanical support to pellets. This support helps the pellets to withstand downstream shock created due to walls of furnace. Redsmelt process accompanies the pellet composition with precise binders.
7. In which of the below process the Oxygen blow is used?
a) Corex process
b) Finex process
c) Fastmet process
d) Fastmelt process
View Answer
Explanation: In corex process the main occupants are iron ore, non coking coal and oxygen. In Fastmet and Fastmelt process pellet type of feed is observed. Oxygen blow is only observed in Corex process to reduce the iron ore in direct manner.
8. Which process accompanies with minimum pollutants?
a) Corex process
b) Finex process
c) Fastmet process
d) Fastmelt process
View Answer
Explanation: In finex process elimination of preliminary processing is the main function. This function is what that claims the finex process is the least expensive and also minimized pollutant level. Pollutants like Cox, SOx are least compared to other process.
9. Rotary hearth furnace is used in _________
a) Corex process
b) Finex process
c) Fastmet process
d) Fastmelt process
View Answer
Explanation: In Fastmet process, the input is in the form of pelletfeed. This feed is moved to Rotary hearth furnace on further process. This proceeds to convert the pellet composition into direct reduced iron.
10. Powder iron is produced in __________
a) Corex process
b) Hogans process
c) Fastmet process
d) Fastmelt process
View Answer
Explanation: In Corex process, the product formed is liquid iron. In Fastmet and Fastmelt process, sponge iron is produced which is of solid state. Hogans process is the only process in which iron is produced in the form of powder.
11. Natural gas is used as a reductant in __________
a) Midrex process
b) Finex process
c) Corex process
d) Fastmelt process
View Answer
Explanation: Finex process and Fastmelt process, both constitutes coal fines as its reductant. In Corex process coal lumps are used as reductant. Midrex process is the only process to have natural gas as a reductant.
Sanfoundry Global Education & Learning Series – Iron Making.
To practice all areas of Iron Making, here is complete set of 1000+ Multiple Choice Questions and Answers.
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