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Vocabulary development

2.2. Match the English words to their Russian equivalents.

1

steam engine

a

насос

2

prime mover

b

срок годности

3

pumping machine

c

паровой двигатель

4

reliability

d

применение

5

service life

e

повышение механических свойств

6

application

f

первичный двигатель, тягач

7

strengthening

g

надежность

2.3 Read the following international words and check their pronunciation in a dictionary.

thermodynamics hydraulic

ventilating refrigerating

transportation automation

structure pyramid

turbine textile

identify efficient

2.4. Match the following words with their definitions

turbine/ boiler/ refrigerator/ productivity/ engine/ ventilator/ hydraulic/ pump

  1. ______ is a machine with moving parts that uses fuel to produce movement

  2. ______ is a piece of equipment for making a liquid or gas move into or out of smth.

  3. ______ is a machine that heats water and provides hot water for a heating system.

  4. ______ means using of water or oil to make a machine work.

  5. ______ is a machine that brings fresh air into a room or a building.

  6. ______ is a machine that keeps food or drinks cold.

  7. ______ is the rate at which goods are produced.

  8. ______ is a machine that uses the pressure of liquid or gas on a wheel to get power.

2.5 Complete the following sentences and translate them

  1. Engineering deals with …

  2. With the invention of the steam engine and the growth of factories …

  3. Mechanical engineering has been recognized as a separate branch of engineering since …

  4. Mechanical engineering is concerned with …

  5. The scientific and technological progress will go on …

  6. Raising reliability requires …

  7. New generations of machines and equipment would allow …

Speaking

2.6 Speak on the topic Mechanical Engineering and Machine Building. (200 – 250 words).

Make use of the following plan.

  1. The History.

  2. Spheres of useage.

  3. Further development.

Unit 3

3.1. Read the text and answer the questions:

  1. What are metals and what do we call metallurgy?

  2. Why are most metals dense?

  3. Why are metals malleable?

  4. What are grains?

  5. What is alloying?

  6. What is crystalline structure?

  7. What changes the size of grains in metals?

Metals

Metals are materials most widely used in industry because of their properties. The study of the production and properties of metals is known as metallurgy.

The separation between the atoms in metals is small, so most metals are dense. The atoms are arranged regularly and can slide over each other. That is why metals are malleable ( can be deformed and bent without fracture ) and ductile ( can be drawn into wire ). Metals vary greatly in their properties. For example, lead is soft and can be bent by hand, while iron can only be worked by hammering at red heat.

The regular arrangement of atoms in metals gives them a crystalline structure. Irregular crystals are called grains. The properties of metals depend on the size, shape, orientation, and composition of these grains. In general, a metal with small grains will be harder and stronger than one with coarse grains.

Heat treatment controls the nature of the grains and their size in the metal. Small amounts of other metals (less than 1 per cent) are often added to a pure metal. This is called alloying (легирование) and it changes the grain structure and properties of metals.

All metals can be formed by drawing, rolling, hammering and extrusion, but some require hot-working. Metals are subject to metal fatigue and to creep (the slow increase in length under stress) causing deformation and failure. Both effects are taken into account by engineers when designing, for example, airplanes, gas-turbines, and pressure vessels for high-temperature chemical processes. Metals can be worked using machine-tools.

The ways of working a metal depend on its properties. Many metals can be melted and cast in moulds, but special conditions are required for metals that react with air.

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