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VIII. Connect sentences according to the contents:

1. There are trench excavators a) although they can dig trenches no deeper

than 2.5 metres.

2. The buckets will be underloaded b)which are differentiated by the cutting depth

3. Wheel excavators are more

wear-resistant c) than chain-type excavators.

4. Wheel excavators have greater

capacity d) if the excavator travels too fast.

IX. Complete the sentences using variants (a) or (b).

1. Trench excavators are differentiated by …

  1. … the hourly output;

  2. … the cutting depth.

2. Chain quarry excavators are differentiated by …

  1. … the capacity of the buckets;

  2. … the hourly output.

3. Wheel excavator are differentiated by …

  1. … the cutting depth;

  2. … the hourly output output.

4. Chain excavators make trenches for …

  1. … gas and oil lines;

  2. … cables and sewerage pipes, etc.

5. Wheel excavators are widely used for …

  1. … excavating trenches for gas and oil lines;

  2. … cables and sewerage pipes.

X. Fill the gaps with prepositions.

1. Some types … excavators can strip capping … baring operations.

2. Trench excavators are differentiated … the cutting depth.

3. Wheel excavators dig trenches … 2.5 meters deep.

4. The inclined frame … the excavator is lowered … the ground.

5. The vertical frame … the trencher is raised and lowered … a chain and a hoist.

6. The buckets are dumped forward … the direction … motion … the conveyer.

7. The bucket chain is driven … the engine … the reduction gear.

XI. Insert the verbs in the proper form. Translate the sentences.

1. Multi-bucket excavators … into different types.

2. If the excavator … too fast, the buckets will be under-loaded.

3. If the excavators … too slowly the buckets … some of the material.

4. The vertical frame of the trencher … and … by a chain and a hoist.

5. The bucket chain … by the engine through the reduction gear.

6. Wheel excavator can … trenches no deeper than 2.5 meters.

XII. Use Complex Subject and Complex Object instead of complex sentences.

Example: We know that quarry shovels are used for digging very heavy soils.

Мы знаем, что карьерные экскаваторы используются для копания

очень тяжелых грунтов.

Quarry excavators are known to be used for digging very heavy soils.

Известно, что карьерные экскаваторы используются для копания

очень тяжелых грунтов.

We know quarry excavators to be used for digging very heavy soils.

1. We know that the repair of damaged cars begins in the sheet metal shops.

2. We know that multi-bucket excavators are employed to dig longitudinal cuts and to shape their slopes.

3. We consider that multi-bucket excavators are classified by the method of excavation.

4. It is proved that trench excavators are differentiated by the cutting depth.

5. We know that the bucket chain is driven by the engine through the reduction gear.

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