This set of Building Construction Multiple Choice Questions & Answers (MCQs) focuses on “Ferrous Metals – 1”.
1. Latin word for iron is ________
a) Ferrium
b) Ferrious
c) Ferrumous
d) Ferrum
View Answer
Explanation: Latin word for iron is Ferrum. It is chemically denoted as Fe. Metals are grouped into two categories – ferrous metals and non-ferrous metals. Ferrous metals consist of iron as their main constituent while non-ferrous metals do not consist of iron as the main constituent.
2. Which of the following is the red oxide of iron?
a) Haematite
b) Limonite
c) Pyrite
d) Siderite
View Answer
Explanation: Haematite is the red oxide of iron. It contains about 65-70 % of the iron in its pure state. It is available in the state of Madhya Pradesh in India.
3. Pyrite is an oxide of iron.
a) True
b) False
View Answer
Explanation: Pyrite is a sulphide of iron. The maximum iron content in it is about 45-47 %. This ore is widely spread in almost all parts of the world.
4. Which of the following is the black oxide of iron?
a) Limonite
b) Magnetite
c) Siderite
d) Pyrite
View Answer
Explanation: Magnetite is the black oxide of iron. Magnetite is the richest iron ore and contains about 70-73 % of the iron in its pure state. It is available in Madras in India.
5. The crude impure iron extracted from the ores of iron is called as __________
a) Cast iron
b) Wrought iron
c) Steel
d) Pig iron
View Answer
Explanation: Pig iron is the crude impure iron extracted from the ores of iron. Pig iron is one of the basic materials used in the manufacturing of steel, wrought iron as well as cast iron.
6. Smelting is carried out in a ___________
a) Funnel
b) Kiln
c) Blast furnace
d) Flask
View Answer
Explanation: Smelting is carried out in a blast furnace. The essential parts of a blast furnace are throat, stack, cylinder, bosh, hearth, tuyeres, feeding arrangement and some additional equipment. Smelting is the process of melting in order to separate metal from its ore.
7. Which of the following is the lowest part of the blast furnace?
a) Hearth
b) Stack
c) Throat
d) Bosh
View Answer
Explanation: Hearth is the lowest part of the blast furnace. It is also known as the crucible. This portion of the furnace is used to collect slag and molten iron.
8. Commonly used fluxing material used in the process of smelting is ___________
a) Limestone
b) Sandstone
c) Concrete
d) Cement
View Answer
Explanation: Commonly used fluxing material used in the process of smelting is limestone. Fluxing material is a substance that can be readily fused and mixes with the impurities present in the ores of iron and forms a fusible slag.
9. Which of the following is the hottest part of the blast furnace?
a) Throat
b) Stack
c) Bosh
d) Cylinder
View Answer
Explanation: Bosh the hottest part of the blast furnace. It is the burning zone of the furnace. Bosh is located between the cylinder and the hearth.
10. Which of the following is not a variety of pig iron?
a) Bessemer pig
b) Pink pig
c) Grey pig
d) White pig
View Answer
Explanation: The various varieties of pig iron are Bessemer pig, mottled pig, white pig and grey pig. Mottled pig lies somewhere between the white pig and grey pig. Bessemer pig is obtained from haematite ores.
11. Small amounts of _____________ and __________ improve the quality of Bessemer pig.
a) Copper and sulphur
b) Silicon and phosphorus
c) Silicon and manganese
d) Phosphorus and sulphur
View Answer
Explanation: Small amounts of silicon and manganese improve the quality of Bessemer pig. However, it should be free from phosphorus, copper and sulphur.
12. Grey pig is produced when the blast furnace is not provided with sufficient fuel while the white pig is produced when the blast furnace is provided sufficiently with fuel.
a) True
b) False
View Answer
Explanation: The white pig is produced when the blast furnace is not provided with sufficient fuel while the grey pig is produced when the blast furnace is provided sufficiently with fuel. White pig is used in the manufacturing of wrought iron.
13. Which of the following statements about electric reduction furnace is not true?
a) It is adopted at places where electric power can be cheaply generated
b) Less amount of fluxing material is needed
c) Less amount of slag is created
d) The external supply of air is essential in this type of furnace
View Answer
Explanation: Electric reduction furnace is adopted at places where electric power can be cheaply generated. In this, less amount of fluxing material is needed and less amount of slag is formed. The external supply of air is not essential in this type of furnace.
14. Remelting of pig iron with limestone and coke to manufacture cast iron is carried out in a ____________
a) Flask
b) Blast furnace
c) Cupola furnace
d) Ball mill
View Answer
Explanation: Remelting of pig iron with limestone and coke to manufacture cast iron is carried out in a cupola furnace. It has a smaller size than the blast furnace and its shape is cylindrical.
15. Which of the following statements about low shaft blast furnace is not true?
a) In this, the blast is rich in oxygen
b) The gas produced has a low calorific value
c) The oxygen consumed by this furnace can be made available from natural air
d) It consumes fine ores
View Answer
Explanation: In a low shaft blast furnace, the blast is rich in oxygen. The oxygen consumed by this furnace can be made available from natural air. It consumes fine ores and the gas produced has high calorific value.
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