Exercise 5: 1. What is the most important metal for industry? 2. How can we define an alloy? 3. Is the use of all

Exercise 5:
1. What is the most important metal for industry?
2. How can we define an alloy?
3. Is the use of all metals possible in industry?
4. How do we refer to alloys made of iron combined with carbon?
5. Why are ferrous metals more extensively utilized than nonferrous ones?
6. What characteristics of metals make them highly advantageous in engineering?

Exercise 6:
1. Alloys are materials that consist of a combination of a single metal.
2. The most significant nonferrous metals are…
3. Metals are of great importance because…
4. Although stone can be very hard, it…

Exercise 7:
1. Metals are used by man after wood and stone.
2. Engineering metals are used in industry in the form of alloys.
3. Different metals are produced in different ways.
4. The first metal that was produced by people was copper.

Exercise 8:
1. Iron is the most important among the engineering metals.
2. Iron is used in the industry in the form of an alloy with carbon.
3. The most useful technical properties of metals are hardness, strength, and ductility.
4. Pure iron cannot be used in industry because it is very soft.

Exercise 9:
1. Nonferrous metals are used less than ferrous metals.
2. The ferrous metals are cheaper than nonferrous metals.
3. Metals have the greatest importance for industry.
4. Metals are more important for industry than stone and wood.
5. Wood is much softer than metals.
6. The strength, hardness, and plasticity of metals are useful properties in engineering.