Here are Iron Making MCQs (Chapterwise).
1. What is the primary raw material used in the blast furnace for iron making?
a) Iron ore
b) Coal
c) Limestone
d) Coke
View Answer
Explanation: Coke is a special type of coal that we use in the blast furnace. It’s like the fuel that helps to make iron from iron ore.
2. Which temperature range is typically maintained in the blast furnace for iron making?
a) 500-800°C
b) 1000-1200°C
c) 1500-1700°C
d) 2000-2200°C
View Answer
Explanation: High temperatures in the range of 1500-1700°C are maintained in the blast furnace for efficient iron ore reduction and melting.
3. What is purpose of adding binders to green pellets?
a) Withstand downstream shock
b) Chemical support
c) Increase porosity
d) Increase in size
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.
4. What is the major perk of using low ash coke in blast furnace?
a) Increases slag rate
b) Decreases slag rate
c) Decreases productivity
d) Increases consumption of fuel
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.
5. Which of the following is the purest iron?
a) Steel
b) Pig iron
c) Cast iron
d) Wrought iron
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.
6. Which notch is located in upper region of blast furnace compared to others?
a) Iron notch
b) Clinder notch
c) Silica notch
d) Coke notch
View Answer
Explanation: Slag notch is also called as clinder notch. Slag is less dense than molten iron. This lower density of slag facilitates to flow over the molten iron which made the Clinder notch located in upper region.
7. Which of the following materials are used as refractory in Blast furnace?
a) Lead material
b) Bismuth made materials
c) Fireclay bricks
d) Cadmium made materials
View Answer
Explanation: Fireclay bricks are used as refractories in blast furnace. Fireclay bricks are composed from a blend of usually two or more clays. The other options are completely of low melting points which cannot withstand the temperature of Blast furnace.
8. What is the carbon percentage present in Pig iron produced in blast furnace?
a) 0.05-0.25%
b) 0.25-0.59%
c) 4-5%
d) 1-2 %
View Answer
Explanation: Pig iron produced in blast furnace is brittle in nature. This pig iron consists of high carbon content (4-5%). Pig iron produced by blast furnace on further processing produces various grades of steel.
9. What is the source of the principal reducing agent in Blast furnace?
a) Silica
b) Ironore
c) Limestone
d) Coke
View Answer
Explanation: Carbon is the principal reducing agent used in B.F. The principal source of carbon is Coke. So, the principal source of reducing agent in blast furnace is Coke.
10. What is the effect of1% increase in methane on RAFT temperature?
a) Decreases the RAFT by 6°C
b) Decreases the RAFT by 5°C
c) Decrease the RAFT by 56°C
d) Increase the RAFT by 56°C
View Answer
Explanation: The 1% methane added to blast C decreases the RAFT by 56°C. Changes in the furnace conditions change the RAFT temperature correspondingly. RAFT stands for raceway adiabatic flame temperature.
11. What is the height of the ‘Thermal Reserve Zone’ in a typical blast furnace?
a) 1m-4m
b) <1 m
c) >8m
d) 6m-8m
View Answer
Explanation: The TRZ is a zone where no heat exchange takes place; it is a narrow zone where the heat capacity of solid charge and gas becomes equal.
12. What role does the hearth play in the process of iron making?
a) The chemical reactions occur in the hearth
b) Collects the hot metal and slag
c) Supports the overlying burden
d) Serves as the inlet for charge
View Answer
Explanation: The hearth acts as crucible for collecting hot metal and slag. The burden in the stack of the blast furnace is supported by the ‘Dead man’s Zone’. The chemical reactions occur mostly in the cohesive zone and the active coke zone.
13. What is required to make high-grade blast furnace coke?
a) Electroplating
b) Coating
c) Mixing
d) Blending
View Answer
Explanation: Blending is required to make high-grade blast furnace coke. Blending can be done either when coal is having inadequate plasticity or when coal is too fluid. Blending is done before using these types of coal in blast furnace operation.
14. Which type of distillation is involved in Coke making?
a) Non-destructive distillation
b) Destructive distillation
c) Vacuum distillation
d) Fractional distillation
View Answer
Explanation: Coke making involves destructive distillation (carburization) of coal under controlled conditions and in the absence of air. The carbonisation conditions used in the coke ovens helps in determining the coke properties.
15. What type of magnetic separation will you use to beneficiate iron ore fines of size less than 150 mesh?
a) Magnetic separation along with jigging
b) The iron ores of size 150 mesh cannot be beneficiated
c) Wet magnetic separation
d) Dry magnetic separation
View Answer
Explanation: Wet magnetic separation is used to separate iron ores of size less than 150 mesh. The iron ore fines of size less than 150 mesh carry a risk of flying away during separation, hence they are wetted to minimize the loss of fines.
16. Which of these precautionary measures that can be taken to prevent breakout?
a) Increasing hot metal temperature
b) Hearth refractory with many joints
c) Using steel shell for hearth instead of cast iron shell
d) Hearth refractory with minimum joints and adopting carbon hearth
View Answer
Explanation: Breakout occurs when the wall of the hearth is broken and the hot metal and slag flows out. This can be prevented by using minimum number of refractory joints and adopting corrosion resistant carbon refractories. Increasing the hot metal temperature will speed up corrosion making the hearth more prone to breakouts.
Chapterwise Multiple Choice Questions on Iron Making
- Iron Making Basics
- Overview of Blast Furnace Ironmaking
- Physical Chemistry of Blast Furnace Reactions
- Thermal and Chemical Features of Blast Furnace
- Internal Zones
- Raw Materials: Coke
- Raw Materials: Iron Ore and Agglomerates
- Blast Furnace Productivity
1. MCQ on Iron Making Basics
The section contains multiple choice questions and answers on evolution of iron making and alternative iron making process.
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2. Overview of Blast Furnace Ironmaking
The section covers Iron Making questions and answers on Blast Furnace Ironmaking, summarizing reactions and processes, general constructional features of the blast furnace, and the charging of solid materials from the top.
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3. Iron Making MCQ on Physical Chemistry of Blast Furnace Reactions
The section contains MCQs on the physical chemistry of Blast Furnace reactions, gas-solid reaction equilibria, kinetics of reduction and gasification, mechanism of reduction, blast furnace slag composition, reactions in hearth, and reactions of manganese and titanium.
4. Thermal and Chemical Features of Blast Furnace
The section contains multiple choice questions and answers on important aspects of blast furnace, including its thermal and chemical features, TFT and RAFT, ideal blast furnace, Reichardt’s Diagram and Reserve Zones, Rist Diagram, and Ergun Equation for packed beds and fluidization.
5. Iron Making Questions on Internal Zones
The section covers questions and answers on six internal zones.
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6. Raw Materials: Coke
The section contains MCQs on key aspects of coal and coke making, including availability and types of coal, chemical characteristics for coke production, petrographic features, selection criteria, assessment of coke quality, and the coke-making process.
7. Raw Materials: Iron Ore and Agglomerates
The section contains Iron Making multiple choice questions and answers on iron ore beneficiation.
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8. Iron Making Multiple Choice Questions on Blast Furnace Productivity
The section covers questions and answers on gas flow and furnace irregularities.
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Wish you the best in your endeavor to learn and master Iron Making!
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