November 28
Classwork
1. Прочитайте текст (ГОЛОСОВОЕ ЧТЕНИЕ)
2. Выполните задания ниже текста
Diesel Engine
If you know something about ordinary gasoline engines, such as those in automobiles, you know have noticed that diesel engines in many respects, work in the same way. Both types of engines are internal combustion engines, that is, they burn the fuel inside their cylinders Most gasoline engines and many diesel engines work on the four-stroke cycle, that is, the piston makes a suction stroke, a compression stroke, a power stroke and an exhaust stroke.
What are the main differences between diesel engines and gasoline engines?
1. A diesel engine has no ignition system- It has no spark plug fed with high-tension electricity from a distributor, spark-coil, timer, and battery.
2. A diesel engine draws into its cylinder air alone, and it compresses this air on itscompressions stroke before any fuel enters the cylinder
3. Diesel engines use greater compression than gasoline engines. The compression in a diesel engine is not limited by the possibility of pre-ignition because a diesel engine compresses air only. Therefore, diesel engines use compression ratios of about 16 to 1, and so achieve greater efficiency in the use of fuel.
Why are diesel engines used so much? Not merely because they can produce power - there are many other ways of producing power.
Advantages of Diesel Engines.
Small Consumption of Fuel
Cheap fuel
Economy at Light Loads
Greater Safety
Economy in small Sizes
Independence of Water Supply
Quick Starting
Задания:
1. Переведите слова и словосочетания на русский язык:
gasoline engines, internal combustion engines, diesel engines, four-stroke cycle, the piston, suction stroke, a compression stroke, a power stroke and an exhaust stroke, spark plug fed, distributor, spark-coil, timer, and battery, pre-ignition, water supply
2.Заполните таблицу.
«The main differences between diesel engines and gasoline engines»
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DIESEL ENGINE |
GASOLINE ENGINE |
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3. Закончите предложения, выбрав их из текста:
1)Most gasoline engines and many diesel engines work on the…
2)A diesel engine draws into its cylinder air alone, and it compresses this air on its
3) Diesel engines use ……………… than gasoline engines.
4)Therefore, diesel engines use compression ratios of about…
- Учитель: Антонина Николаевна Гуц