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XI. Fill in the necessary prepositions. Translate the sentences into Russian.

1.Rollers compact soil … the pressure exerted … their rolling wheels… the surface.

2. Smooth steel rollers are no longer used today because they do not compact deeply … proportion … their weight.

3. The roller composed … three sections is towed … a C-100 tractor.

4. Compactors are classified … the kind … energy used.

5. Compactors may be employed to compact soil … the bottom and … the top … the slopes … cuts.

6. Rollers are the simplest machines used … soil compacting.

XII. Express your agreement or disagreement with the following statements.

1. In my opinion compactors may be classified according to the mode of movement.

2. It seems to me that compactors are not employed when building roads.

3. I think that rollers are considered to be the simplest machines for soil compacting.

4. It is said that smooth steel rollers are widely used now.

5. In my opinion sheep-foot rollers are most widespread at present.

XIII. Make up questions according to the models using the words given below.

Models: 1. What are vibration rollers used for ?

compactors

multi-bucket excavators

scrapers

graders

2. How are compactors classified ?

power graders

elevating graders

bulldozers

loaders

3. What is the roller composed of ?

a tower crane

an elevating grader

a belt conveyor

an operating equipment

each section of a roller

XIV. Ask questions on the underlined words.

1.Vibration rollers compact cohesionless soil quite well.

2. Smooth steel rollers are no longer used now because they do not compact deeply.

3. Rollers compact soil by the pressure exerted by their rolling wheels on the surface.

4. Sheep-foot rollers are most widespread at present.

5. Compactors are employed when building roads.

XV. Answer the following questions using the introductory phrases.

1. What is this text about ?

2. What are compactors used for ?

3. How are compactors classified ?

4. How are compactors classified according to the principle of operation ?

5. What machines are the most simplest ones for soil compacting ?

6. What types of rollers are there ?

7. What rollers are no longer used today ?

8. Why are vibration rollers little used as yet in construction ?

9. What rollers are most widespread at present ?

10. What rollers are gaining increasing popularity ?

11. What is a roller composed of ?

12. What does each section of a roller consist of ?

XVI. Translate the following sentences into English.

1. Грунтоуплотняющие машины используются для уплотнения грунта.

2. По способу передвижения грунтоуплотняющие машины могут быть прицепными, полуприцепными, самоходными и навесными.

3. Катки являются наиболее распространенными и простыми машинами, используемыми для уплотнения грунта.

4. Вибрационные катки хорошо уплотняют несвязные грунты.

5. Каток может быть собран из трех или пяти секций.

6. Катки могут быть гладкими, кулачковыми, вибрационными и т.д.

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