Exercises. I. Use the following words and phrases in sentences of your own:

I. Use the following words and phrases in sentences of your own:

thermal, mixture, copper, coating, non-magnetic quality, t in, sheet zinc, lining, to support, lead, core, brass, bronze

II. Retell the text giving answers to the following questions:

l. What ferrous metals do you know? 2. What are the tin main characteristics of non-ferrous metals? 3. What are the properties of copper and what is it used for? 4. What do you know about lead? 5. What purposes is aluminium used for? 6. What are the properties of other non-ferrous metals? 7. What metals are used for producing non-ferrous castings? 8. What do you know about brasses? 9. What do you know about bronzes? 10. What are the main properties of non-ferrous castings? 11. Why are attempts made to replace non-ferrous metals by ferrous ones?

III. State the forms and functions of infinitives and translate the following sentences into Russian:

1. Some metals have to be melted at very high temperatures. 2. To make non - ferrous castings, such metals as zinc, lead, aluminium and others are melted together. 3. To line pipes and electrical cables such metal as lead is used. 4. One must add some tin to make brasses stronger. 5. Very few objects are made of pure tin, but it used to make bronze, babbit, and other alloy metals. 6. Nickel is used for covering iron and brasses to make them look better. 7. Nickel does not rust and can be polished to a very bright, silvery finish. 8. To increase hardness and strength of cast copper some cold-working operations are performed.

IV. Underline the suffixes and prefixes and translate into Russian the following ns of words of the same stem:

to conduct, conductor, conductivity; red, reddish; silver, silvery; to possess, possessive, possession; to plate, plating; to alloy, alloying, to resist, resistance, resistant; strong, strength, to strengthen; hard, hardness, to harden, hardening; pure, impure, purity, impurity, to purify, purification

V. Translate the following sentences paying attention to the different meanings of the word make:

1. Addition of copper, zinc and iron makes aluminium stronger. 2. The Soviet makes of new cranes are well known all over the world. 3. The foreman makes the learners pay attention to the casting process.

VI. Translate the following sentences into English using infinitive constructions.

Example: Для того чтобы увеличить производство металла, необходимо применить новые методы его выплавки.

То increase the output of metal it is necessary to apply new methods of smelting.

1. Для того чтобы увеличить прочность бронзы и сопротивление на износ, к её составу можно добавить, кроме меди и олова, некоторые другие элементы. 2. Фосфорную бронзу можно получить добавлением небольшого количества фосфора к смеси меди и олова. 3. В практике литейного производства цветные металлы стараются заменить более дешёвыми ферросплавами, которые обладают такими же свойствами. 4. Алюминий используется для изготовления различных предметов домашнего обихода. 5. Для того чтобы сделать железо коррозие-устойчивым, его можно покрыть никелем.

VII. Make up as many questions as possible on the basis of the following sentences:

1. Copper is used for making electrical contacts and wires because of its high electrical conductivity. 2. Aluminium possesses high corrosion-resistant qualities. 3. Non-ferrous castings differ greatly from ferrous ones. 4. Aluminium is extensively used for castings that are to be light in weight.

VIII. Translate the following text in written form without using a dictionary:

NON-FERROUS METALS

The metals most frequently used to make non-ferrous castings are copper, tin, zinc, lead, and aluminium. These non-ferrous metals have better resistance to corrosion than steel and they are usually easier cast and worked. There are many

applications of non-ferrous metals and only few manufactures or machines are made that do not require the service of some or other non-ferrous component. For most purposes the pure non-ferrous metals are too soft and other alloying elements have to be added to create particular physical properties as required by each application. For this purpose non-ferrous metals are mixed in various proportion to form different alloys, such as brasses, bronzes and aluminium alloys, which can be strong, weak, hard or soft. Their cost is considerably greater than that of carbon steel but less than of some of the alloy steels.

Дата добавления: 2014-12-27