This set of Iron Making Multiple Choice Questions & Answers (MCQs) focuses on “Blast Furnace Ironmaking”.
1. Why is the burden inserted into blast furnace is converted into pellets rather than fine ore?
a) Permeability of hot air
b) Low size of pellets
c) Cost of production
d) Faster output
View Answer
Explanation: Permeability of hot air completely facilitates the iron making in Blast furnace. The flow ability of gasses between the gaps of pellets makes the process successful. This flow ability is what decreases resistance to air that flows up during Smelting.
2. What material is added to remove the impurities of the burden in Blast furnace Iron making?
a) Copper
b) Lead
c) Sulphur
d) Dolomite
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Explanation: Dolomite is added to blast furnace from the top. Dolomite/Lime removes gauge materials in feed materials. High grade dolomite is in use though blast furnace was modernized many times.
3. What is the major perk of using low ash coke in blast furnace?
a) Decreases productivity
b) Increases consumption of fuel
c) Decreases slag rate
d) Increases slag rate
View Answer
Explanation: Low ash coke is used in blast furnace it produces very less amount of ash. This low ash coke facilitates in less slag production. Low ash coke is used in furnaces where high temperatures and uniform heating is required.
4. What percentage of gas is consumed to preheat the blast?
a) 20-45%
b) 30-65%
c) 65-90%
d) 90-95%
View Answer
Explanation: 20-45% of gas is used to preheat the blast in BF. The air blast is heated in hot Blast stove. Preheating of the blast reduces the Fuel required in Blast furnace.
5. What kind of heating is done in Blast furnace stove to preheat the air blast?
a) Direct heating
b) Indirect heating
c) Low temperature heating
d) Only cooling is done
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Explanation: The air is blown by turbo blowers in blast stove. This gets heated through contact with hot checker bricks. This indirectly heated gas flows through tuyeres into blast furnace.
6. The hot air blown through ___________
a) Stack
b) Hearth
c) Tuyeres
d) Top charge
View Answer
Explanation: The hot air is blown through tuyeres. These tuyeres are in the middle of the Blast furnace. This middle locality facilitates for the easy flow of hot air which proceeds to further chemistry of blast furnace.
7. What is the name of the product from blast furnace?
a) Pig iron
b) Wrought iron
c) Cast iron
d) Steel
View Answer
Explanation: Pig iron is the product of the Blast furnace. When the metal had cooled and hardened the ingots which are of pig shape were simply broken from the runner (sow).This why the product was named as Pig iron.
8. Which of the following is the purest iron?
a) Pig iron
b) Cast iron
c) Wrought iron
d) Steel
View Answer
Explanation: Wrought iron is the purest form of iron. This is the solid form of iron. This was of lower carbon concentration which made it the purest iron.
9. The maximum heat generated in the Blast furnace is due to__________
a) Reaction of Oxygen with Carbon
b) Burners
c) Blast furnace design
d) Reaction of gaunge with dolomite
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Explanation: Reaction of oxygen from hot air with Carbon from coke produces heat in the Blast furnace. This is one of the reasons why preheated air is sent into the blast furnace. This reaction also produces CO which is collected at the top.
10. Blast furnace Production increases because of ___________
a) Increase in height
b) Increase in width
c) Low silicon hot metal
d) High Silicon hot metal
View Answer
Explanation: Low silicon hot metal is used to increase the productivity rather than all the above options. Burden with high silicon produces more slag. This more amount of slag collecting becomes a little tougher issue, so low silicon hot metal is used.
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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