Английский язык

to be of recent origin – быть недавнего происхождения

implement – орудие, приспособление

wheel – колесо

inclined plane – наклонная плоскость

slave – раб lever – рычаг

powerful device – мощное устройство

Answer the questions.

1. What implements have come from ancient times?

2. What role did the inclined plane play?

3. What can you say about machine development in the 20th century?

4. What "clever machines" do you know?

5. What were these machines used for?

Text 3

The internal combustion engine

The internal combustion engine is an engine in which the combustion of a fuel (normally a fossil fuel) occurs with an oxidizer (usually air) in a combustion chamber that is an integral part of the working fluid flow circuit. In an internal combustion engine (ICE) the expansion of the high-temperature and high-pressure gases produced by combustion apply direct force to some component of the engine. The force is applied typically to pistons, turbine blades, or a nozzle. This force moves the component over a distance, transforming chemical energy into useful mechanical energy. The first commercially successful internal combustion engine was created by Еtienne Lenoir

The cycle is characterized by four strokes, or straight movements alternately, back and forth, of a piston inside a cylinder:

1. intake (induction) stroke

2. compression stroke

3. power (combustion) stroke

4. exhaust stroke

1) The cycle begins at top dead center, when the piston is at its uppermost point. On the first downward stroke (intake) of the piston, a mixture of fuel and air is drawn into the cylinder through the intake (inlet) port.

2) The intake (inlet) valve (or valves) then close(s), and the following upward stroke (compression) compresses the fuel-air mixture.

3) The air-fuel mixture is then ignited, usually by a spark plug for a gasoline or by the heat and pressure of compression for a Diesel cycle of compression ignition engine, at approximately the top of the compression stroke.

4) The resulting expansion of burning gases then forces the piston downward for the third stroke (power), and the fourth and final upward stroke (exhaust) evacuates the spent exhaust gases from the cylinder past the then-open exhaust valve or valves, through the exhaust port.

Wordlist

internal combustion engine – двигатель внутреннего сгорания

fuel – топливо

to occur – происходить

chamber – камера

piston – поршень

nozzle – форсунка, наконечник, выпускное отверстие

stroke – ход, такт

intake – всасывание compression – сжатие

to ignite – воспламенять(ся) зажигать

spark plug – запальная свеча

approximately – приблизительно

downward (upward) – движение вниз (вверх)

exhaust gases – отработанные (выхлопные) газы

valve – клапан

spring – пружина

Answer the questions.

1. What is internal combustion engine?

2. What process produces force in the engine?

3. Who created the first ICE?

4. What are the main strokes in the ICE?

5. Can you describe them?

Text 4

The Wheel

One of mankind s earliest and greatest inventions was the wheel. Without it there could be no industry, little transportation or communications, only crude farming, no electric power. Nobody knows when the wheel was invented. There is no trace of the wheel during the Stone Age, and it was not known to the American Indians until the White Man came. In the Old World it came into use during the Bronze Age, when horses and oxen were used as work animals.

At first all wheels were solid discs. The problem to be solved was to make the wheels lighter and at the same time keep them strong. At first holes were made in the wheels, and they became some with iron and then with rubber.