threshing mechanism powered by its own engine usually of 60 to 150 h.p. The self-propelled combine is operated by one man. It is easy to handle and transport it from field to field. It is provided with a gearshift to give desired field and road speeds. All the controls used to operate the combine are close to the driver.
3. To solve the dust problem, an air-conditioned cab is usually fitted to a combine. Self-propelled combines are made in width of cut ranging from about 1.5 m to 6 m (5-20 ft.).
They have a large variation in forward speed and this allows it to deal with a wide range of crops.
4. A major disadvantage of machines such as self-propelled combine harvesters is that a very expensive machine, with a powerful engine and a complex transmission system stands idle for about eleven months of the year.
The tractor-drawn combine is drawn by a tractor. The smaller combines are driven from the power take-off of the tractor, while the large sizes have an auxiliary engine mounted on the combine to drive it.
V. Ответьте на следующие вопросы к тексту письменно:
1. What machine is used for harvesting grain crops?
2. What operations does a combine harvester perform?
3. The self-propelled machine is the main type of combines, isn’t it?
4. How is the dust problem solved?
5. Does a self-propelled combine harvester have any disadvantages? What are they?
6. What is the difference between a self-propelled and tractor-drawn combines?
Вариант 3
I. Перепишите следующие предложения, подчеркните в каждом из них инфинитив и определите его форму. Переведите предложения на русский язык.
1. The agronomist came to the farmers to speak to them about new methods of growing cucumbers.
2. He didn’t know how to use this new machine in practice.
3. They wanted to repair this tractor.
4. What makes you think so?
5. He must have forgotten about it.
6. The horse was quiet to ride.
7. He seemed to be working hard.
II. Перепишите следующие предложения, подчеркните в каждом из них инфинитив и определите его функцию. Переведите предложения на русский язык.
1. To drive fast is not safe.
2. It is useless to grow these crops there.
3. To decide is to act.
4. The objective of grinding is mainly to make the best use of crops.
5. She gave the calves some milk to drink.
6. She was clever enough to admit it.
7. To drive fast in such weather is dangerous.
III. Перепишите следующие предложения, подчеркните в каждом из них сложное подлежащие (Complex Subject) или сложное дополнение (Complex Оbject). Переведите предложения на русский язык.
1. He is said to be a good engineer.
2. Our agronomist wanted us to use new methods of cultivating plants.
3. I knew them to be right.
4. I saw the tractor stop its working.
5. Vegetables are said to grow well under favourable conditions.
6. I want you to stop worrying.
7. We are sure to come to the heart of the matter.
IV. Прочтите и устно переведите с I по 4 абзацы текста «ConveyingSystems». Перепишитеиписьменнопереведите1, 2, 4 абзацытекста.
Conveying Systems
1. In an automatic feeding system, the feed moves from storage to processing (mixing or grinding) and then to the feeding points.
Equipment or methods that may be used to move or convey feed include bucking elevators, augers and pneumatic conveying systems.
2. Bucket elevators are the most efficient method of conveying feed vertically because they handle feed gently and will not damage whole grain. When large amounts of materials must be elevated and lifted 40 feet or more, and when into-storage handling or storage transfer is required, bucket elevators work best.
3. Augers. In conveying materials augers are less efficient than bucket elevators. They cause some size reduction in ground feed particles, and damage seed materials when conveyed vertically. However, augers can be practical for feed processing systems because of low cost and versatility. They can be used to convey feed from storage to processing and from processing to feed points.
Augers are available in different sizes and in different lengths in each size. A number of auger lengths can be connected to convey feed for several hundred feet.
Auger capacity and power requirement depend on size, length, conveying
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