Iron Making In Metallurgy — Part 1 MCQs with Explanations

The deadman's zone in a blast furnace refers to the central region at the bottom of the furnace where the burden materials slow down and become relatively stagnant. This zone is composed primarily of a closely packed column of coke that remains largely stationary while the surrounding materials continue to descend. The coke in this region supports the overlying burden and provides permeability for the upward flow of gases. It is called the "deadman" because of its limited movement compared to other parts of the furnace burden. Therefore, Option C is correct as the deadman zone consists mainly of coke only .

In the context of iron making in metallurgy, basicity is defined as the ratio of the percentage of calcium oxide (%CaO) and magnesium oxide (%MgO) to the percentage of silicon dioxide (%SiO 2 ) in the slag. The basicity of the slag is an important factor in the blast furnace process as it affects the melting point and fluidity of the slag, which, in turn, influences the efficiency of the iron-making process. In Indian blast furnaces, the typical range of basicity is 0.7 to 1.0. This range ensures that the slag composition is suitable for the efficient extraction of iron from iron ore. The other options do not accurately represent the typical basicity range for slag in Indian blast furnaces. Therefore, the correct answer is Option A: 0.7 - 1.0 .

Desulfurisation is the process of removing sulphur from hot metal (usually molten iron) to improve its quality. This process is favoured by a reducing atmosphere because an oxidising environment can lead to reversion of sulphur back into the metal. A basic slag (rich in lime, CaO) reacts with sulphur to form calcium sulphide (CaS) , which is stable and can be easily removed. Thus, a reducing and basic slag environment promotes maximum sulphur removal by encouraging the formation and retention of CaS in the slag phase. Therefore, Option D is the correct answer as it provides the most favourable conditions for desulfurisation.

all of these is the correct answer to “purpose of flux in blast furnace”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

increases the time of contact between gas and solid is the correct answer to “High top pressure in the blast furnace”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

oxidising and basic slag is the correct answer to “Dephosphorisation of molten pig iron is favoured by”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

suppresses the solution loss reaction is the correct answer to “High top pressure in a blast furnace operation”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

cohesive zone is the correct answer to “The zone where the entire charge is in semi-solid or in softened condition except coke inside the BF is called . . . . . . . . zone”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

C + O2 ⟶ CO2 is the correct answer to “The primary source of heat in cupola melting is provided by the reaction:”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

Durgapur is the correct answer to “External desiliconisation of hot metal is carried out in the steel plant located at”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

lowering of the raceway temperature is the correct answer to “Humidification of the blast in the iron blast furnace leads to”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

increases the silicon content in the hot metal is the correct answer to “High top pressure in blast furnace”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

negligible is the correct answer to “The exit gases of blast furnace contains . . . . . . . . % carbon-monoxide, when equilibrium is achieved.”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

P-3, Q-1, R-2, S-4 is the correct answer to “Group I is a list of technologies for alternate methods of producing iron. Group II is a list of terms you come across in the context of these technologies. Match the items. Group I Group II P. MIDREX 1. Retort Q. COREX 2. Rotary kiln R. SL/RN 3. Smelting reduction S. HyI- I 4. Shaft furnace”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

P, R is the correct answer to “In the blast furnace, as the oxygen percentage in air blast increases, the P. flame temperature increases Q. blast volume increases R. blast volume decreases S. flame temperature decreases”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

counter-current reactor is the correct answer to “Blast furnace is a”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

swelling tendency is the correct answer to “Pellets are not popular as a burden material as sinter in the iron blast furnace, because of their”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

large mass of that material gets stuck to the furnace wall is the correct answer to “Scaffolding is a”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

FeO is the correct answer to “The chemical formula of Wustite is”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

gas is the correct answer to “Maximum tonnage of . . . . . . . . is produced in blast furnace during iron making.”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

in the blast furnace shaft is the correct answer to “Solution loss reaction occurs”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

3 - 6% is the correct answer to “An increase in ash content of coke by 1%, decreases the production rate by”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

Stack is water cooled is the correct answer to “Select the correct statement for a blast furnace.”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

bronze is the correct answer to “The tuyeres of a blast furnace is made of . . . . . . . .”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

chemical process is the correct answer to “The sintering of iron are is predominantly a”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

carbon brick is the correct answer to “The hearth line is made up of”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

little amount of slag is the correct answer to “Sponge iron contains . . . . . . . .”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

blast furnace slag is the correct answer to “Cement can be manufactured from . . . . . . . .”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

fluorspar is the correct answer to “. . . . . . . . is a neutral flux.”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

1300° - 1500°C is the correct answer to “The temperature of the hearth is . . . . . . . .”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

stack is the correct answer to “The top portion of the blast furnace is called . . . . . . . .”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

hot metal is the correct answer to “Most of the phosphorous present in the blast furnace burden enters into”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

level of tuyers is the correct answer to “Coke bed height in a cupola is measured from the”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

28 is the correct answer to “A hundred feet high blast furnace has hearth of internal diameter . . . . . . . . feet.”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

Both A and B is the correct answer to “Why natural gas is not used directly as a reducing agent in Midrex process”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

Hematite is reduced to magnetite in the lower part of the shaft is the correct answer to “Identify the correct statement with reference to blast furnace iron making.”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

increases the reactivity of coke is the correct answer to “Alkali metal oxide content in the blast furnace raw material”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

low shaft furnace is the correct answer to “Direct reduction of iron ore is possible in . . . . . . . .”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

ncement is the correct answer to “Slag is not used as raw material for . . . . . . . . making”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.

200 - 250 is the correct answer to “Temperature of blast furnace gas emanating from blast furnace is about . . . . . . . . degree C”. This question is standard in competitive examination syllabi for Iron Making In Metallurgy.