Engineering Questions with Answers - Multiple Choice Questions
Chemical Industry MCQ’s – Iron
1 - Question
Which among the following is not an iron ore?
a) Hematite
b) Magnetite
c) Siderite
d) Pyrrhotite
View Answer
Explanation: Pyrrhotite is an ore of Ni whereas hematite (Fe2O3), magnetite (Fe3O4) and siderite (FeCO3) are the ores of Iron.
2 - Question
Which among the following is an essential chemical reaction for the manufacture of pig iron?
a) Fe2O3 + 3C → 2Fe + 3CO
b) FeS + C → Fe + CS
c) Fe3O4 + S → 3Fe + SO4
d) Fe2O3 + S → 2Fe + SO3
View Answer
Explanation: Coke is reacted with hematite at a high temperature through a furnace. As air reacts with coke CO and heat is generated as iron oxide is reduced, molten iron gathers at the base of the furnace.
3 - Question
How can the production of pig iron be increased?
a) Increasing temperature decreasing pressure
b) Decreasing temperature
c) Increasing pressure
d) Decreasing pressure
View Answer
Explanation: Increased production of pig iron can be achieved by increasing the pressure conditions. This reduces dust carry over and allows higher production rates.
4 - Question
What are the raw materials needed for the manufacture of pig iron?
a) Iron ore-Calcium-Coke
b) Iron ore-Coke
c) Iron ore-Calcium
d) Iron ore-Coke-Limestone
View Answer
Explanation: Coke and limestone are introduced by conveyors onto a furnace which is reacted with the iron ore along with a hot air blast at a temperature of 600-800°C.
5 - Question
Coke consumption can be reduced in the manufacture of pig iron.
a) False
b) True
View Answer
Explanation: Coke consumption can be reduced in the manufacture of pig iron by using supplementary oil injection. Up to 20% savings can be made.