1. Образуйте от следующих слов производные с помощью риставки "re".

Образец: place - replace

помешать - перемешать

Move, use, coat, new, tell, act, read, collect, arm, construct, consider, ouble, elect, fill, fresh.

II. Заполните пропуски словами, данными ниже:

1. Different types of... are used to keep the air clean.

2. Air filters are divided into groups according to their …

2. The filtering efficiency depends on the... of oust removed by filters.

2. The pad is being placed between ... of expanded metal.

3. The … electrostatic filters is high.

6. Electrostatic filters consist of a series of …

7. … filters are bulky.

8. Wetted filters are cleaned by ... the oil off.

Washing, filters, filtering, efficiency, sheets, ionising, wires, fabric.

III. Представьте, что вы не поняли следующих утверждений. Как вы переепросите?

1. Different types of filters are used.

2. Dry filters are cleaned by removing and shaking them.

3. The filtering material is coated with mineral oil.

4. The diferection of the air in the filter is continually changed.

5. Muslin is stretched over frames or spacers in the filter.

6. Electrostatic filters are also affective.

7. Fabric filters are renewed by vacuum cleaning.

8. The dust is sticking to the surface of the filter.

IV. Выразите согласие или несогласие со следующими ут­верждениями, используя выражения:

Yes, you are right.

No. you are wrong.

1. The purpose of air filtration is to keep the air clean.

2. Dry filters consist of a series of icnising wires.

3. Fabric filters are not afficient.

4. The cost of electrostatic filters is high.

5. The dust is sticking to the surface of the filter.

6. There are only two types of filters.

7. The pad is placed between sheets of expanded metal.

8. Wetted filters are cleaned by removing and shacking them.

V. Поставьте вопросы к подчеркнутым словам:

1. Air filters are used to keep the air free from dust,

2. Filtering efficiency depends on the quantity of dust removed by filters.

3. Dry filters consist of a pad of material such as steel wool.

4.. The pad is placed between sheets of perforated metal.

5. Fabric filters are renewed by replacing with the new material.

6. Electrostatic filter needs an electrical supply.

VI. Ответьте на следующие вопросы, используя одну из вводных фраз:

As far as I know, to my mind, as far as I remember, if I am not mistaken.

1. What is the purpose of air filtration?

2. According to what are air filters divided into groups?

3. What does the filtering efficiency depend on?

4. What types of filters are there?

5. What do dry filters consist of?

6. Where is the pad placed?

7. How are dry filters cleaned?

8. In what filters is the filtering material coated with mineral oil?

9. What filters are viscous filters?

10. What is the direction of air in viscous filters?

11. How may viscous filters be cleaned?

12. What materials does the air pass through in fabric filters?

13. What filtres are efficient but bulky?

14. How are fabric filters renewed?

15. What can you say about electrostatic filters?

V1I Перескажите текст, используя выражения: