Задания для дифференцированного зачета по специальности «Механизация сельского хозяйства»
ВАРИАНТ № 1
Topic “STEAM ENGINE.”
Vocabulary.
steam chest – паросборник
the more...the more - чем больше….тем больше
mostly - главным образом, большей частью
to invent – изобретать
to boil - кипеть
pipe - труба
steam - пар
valves - клапана
piston - поршень
to reach - достигать
pressure - давление
stroke - ход
speed - скорость
opening - отверстие
Read and translate the text.
STEAM ENGINE.
The steam engine was the first high-speed engineeverinvented. The principle of the steam engine is simple. When water is boiled, it changes in to steam. The more the steam is heated, the more pressure it has.
A steam engine has some important parts. One is a boiler where fire turns water into steam. The steam goes through a pipe to the other important part - the steam chest with a cylinder and a piston in it. There are valves, or openings, in the steam chest. As the piston moves in the cylinder, it opens and closes the valves automatically, so that fresh steam enters just when the piston has reached the end of its stroke. A rod from the piston is connected to a wheel.
Now steam engines are mostly used in locomotives.
2. Answer the questions:
1. What is connected to a wheel?
2. What are some important parts of a steam engine?
3. What can you say about the principle of the steam engine?
4. Are there are valves, or openings, in the steam chest?
5. How now steam engines are mostly used?
3. Fill in missing words:
1. One is a boiler where __________water into steam.
2. A rod from the piston ___________to a wheel.
3. The steam engine was the first ____________everinvented.
4. As the __________in the cylinder, it opens and closes the_____________, so that fresh steam enters just when the piston has reached the end of its stroke.
Missing words: fire turns, valves automatically, high-speed engine, is connected, piston moves.
- Translate into English:
пар нагревается
поршень движется
важные части
огонь превращает воду
высокоскоростной двигатель
паросборник с цилиндром
окончание хода
соединяется с колесом
большее давление
ВАРИАНТ № 2
Topic “DIESEL ENGINE”
Vocabulary.
gallon - галлон - англ. (4,54 л); амер. (3,78 л).
besides – помимо, кроме
to last - длиться, продолжаться, сохраняться
screw – винт
like - похожий, подобный
directly - прямо, непосредственно
alone - один, только
immediately - немедленно, тотчас же
spray - брызги, струя, разбрызгивать, распылять
fuel – топливо
spark plug – искра свечи
to connect - соединять
charging – загрузка
to inject – впрыскивать
to ignite – зажигать
to use – использовать
Read and translate the text.
DIESEL ENGINE
A diesel engine is like a gasoline engine but simpler. Diesel engines are usually larger and can do more work. The fuel used in a diesel engine is oil. In diesel engines only air is blown into the cylinder. It does not need spark plugs. Diesel engines can be four - stroke ones andtwo - stroke ones.
Diesel engines use a cheaper kind of fuel and give more power for each gallon of fuel burned than gasoline engines. Besides they last much longer. In new trains and ships diesel engines run large generators which make electricity. The electricity runs motors which are connected to the wheels of the train or to the ship's screws.
The diesel engine is an internal combustion engine. It uses oil as a fuel. The fuel is introduced in the form of spray and the engine requires no special ignition device.
In the four-stroke cycle Diesel engine air alone is drawn into the cylinder on the charging stroke. This air is being compressed on the return stroke to a very high pressure. The result of the combustion is that the air is heated to a high temperature.
The heavy oil injected into the air at the end of the stroke will be immediately ignited by It. The oil burns rapidly, but without explosion. The compression pressure is much higher than that in any other oil or gas engine.
2. Answer the questions:
1. What happened at the end of the stroke?
2. Is in the four-stroke cycle Diesel engine air or petrol drawn into the cylinder on the charging stroke?
3. What is the result of the combustion?
4. What is fuel used in a diesel engine?
5. A diesel engine is like a gasoline engine but simpler, isn’t it?
6. How diesel engines are used in new trains and ships?
3. Fill in missing words:
1. The ___________is an internal combustion engine.
2. This air is being ________on the return stroke.
3. The electricity ________which are connected to the wheels of the train or to the _________.
4. Diesel engines use a cheaper _________and give more power for each gallon of ________than gasoline engines.
5. In diesel engines only air ______into the cylinder.
Bank of words: compressed, fuel burned, diesel engine, ship's screws, runs motors, kind of fuel, is blown.
4. True or false:
1.In new trains and plane diesel engines run large generators which make electricity.
2. The fuel used in a diesel engine is petrol.
3. In the four-stroke cycle Diesel engine air alone is drawn into the cylinder on the charging stroke.
4. The oil burns slowly, but without explosion.
5. In new trains and ships diesel engines run large generators which make electricity.