Production Of Metal

Question 1

Why is limestone added to the blast furnace?
a) to act as a flux to remove impurities
b) to increase the carbon content of the pig iron
c) to reduce the time needed to melt the iron ore
d) to reduce the melting point of the iron ore

Answer 1

a) to act as a flux to remove impurities

Question 2

The blast furnace is loaded with which materials?
a) silicon, iron ore and coke
b) iron ore, coke and limestone
c) sulphur, coke and limestone
d) iron ore, sulphur and limestone

Answer 2

b) iron ore, coke and limestone

Question 3

In relation to steels, what is coke?
a) an element mined from the earth composed of 50% to 70% iron
b) a fuel source made by removing moisture from coal
c) a sedimentary rock used as a flux in the blast furnace
d) a popular soft drink

Answer 3

b) a fuel source made by removing moisture from coal

Question 4

Cast iron has a high carbon content of 1.7% to 4.5%. It is refined from pig iron using what?
a) the basic oxygen process
b) an electric arc furnace
c) a blast furnace
d) a cupola furnace or an induction furnace

Answer 4

d) a cupola furnace or an induction furnace

Question 5

With the basic oxygen steel-making process, what is the purpose of blowing in oxygen?
a) to combine with the carbon
b) to oxidize the manganese
c) to turn sulphur into slag
d) to unite with the pig iron

Answer 5

a) to combine with the carbon

Question 6

What materials are loaded into the basic oxygen steel-making vessel?
a) iron ore, limestone and coke
b) limestone and scrap steel
c) iron ore, coke and scrap steel
d) scrap steel and pig iron

Answer 6

d) scrap steel and pig iron

Question 7

Which steel-making process is commonly used for making high quality alloy and tool
steels?
a) a blast furnace
b) a basic oxygen furnace
c) an electric arc furnace
d) a cupola furnace

Answer 7

c) an electric arc furnace

Question 8

What is the normal charge for the electric furnace steel-making process?
a) iron ore, coke and limestone
b) carefully selected scrap metals
c) molten iron and limestone
d) iron ore and scrap steel

Answer 8

b) carefully selected scrap metals

Question 9

What is the end product from the blast furnace?
a) stainless steel
b) cast iron
c) iron ore
d) pig iron

Answer 9

d) pig iron

Question 10

What is the continuous casting process?
a) where molten metal is solidified into billets, blooms, blanks, rounds or slabs
b) where pig iron is refined into cast iron
c) where molten steel is poured into moulds
d) where iron ore is turned into pig iron

Answer 10

a) where molten metal is solidified into billets, blooms, blanks, rounds or slabs

Question 11

Pig iron is refined to produce either:
a) cast iron or steel.
b) brass or bronze.
c) iron or carbon.
d) iron ore or coke.

Answer 11

a) cast iron or steel.

Question 12

What is the range of carbon content for cast irons?
a) 0.5% to 1.5%
b) 1.5% to 2.5%
c) 2% to 4.5%
d) 4.0% to 7.0%

Answer 12

c) 2% to 4.5%

Question 13

Which type of steel has a shiny surface?
a) hot rolled
b) cold rolled

Answer 13

b) cold rolled

Question 14

What is the approximate carbon content of low carbon steel?
a) 0.05% to 0.30%
b) 0.30% to 0.45%
c) 0.45% to 0.75%
d) 0.75% to 1.50%

Answer 14

a) 0.05% to 0.30%

Question 15

Which metal leaves the steel-making furnace and is poured into a mould that is in the shape of the final product?
a) pig iron
b) cast steel
c) iron ore
d) limestone

Answer 15

b) cast steel

Question 16

Based on the deoxidization process, what are the four classes of steel?
a) low carbon, medium carbon, high carbon, very high carbon
b) rimmed, capped, semi-killed, killed
c) ferritic, austenitic, martensitic
d) mild, alloy, heat treatable, extra low carbon

Answer 16

b) rimmed, capped, semi-killed, killed

Question 17

Which type of steel is not deoxidized?
a) rimmed
b) semi-killed
c) killed
d) capped

Answer 17

a) rimmed

Question 18

In general, which type of steel is of the highest quality?
a) rimmed
b) semi-killed
c) killed
d) capped

Answer 18

c) killed

Question 19

Why is a cap or seal used in making capped steels?
a) to fully deoxidize the molten steel
b) to decrease the cooling rate and help prevent gas voids
c) to increase the cooling rate and decrease deoxidization
d) to increase the cooling rate and fully deoxidize the steel

Answer 19

b) to decrease the cooling rate and help prevent gas voids

Question 20

Which is true of a semi-killed steel?
a) No deoxidants are added.
b) They are fully deoxidized.
c) A cap or seal is added to the top.
d) A small amount of deoxidizer is added.

Answer 20

d)A small amount of deoxidizer is added.