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14. Work in groups a, b, c, and d. Each group will read the information on the different types of a gas turbine engine. Listen and complete the chart about these engine, then compare them.

Group A – Turbojet (Appendix A, p. 96)

Group B – Turboprop (Appendix A, p. 96)

Group C – Turbofan (Appendix A, p. 97)

Group D – Afterburning Turbojet (Appendix A, p. 97)

Engine Type

Turbojet

Turboprop

Turbofan

Afterburning Turbojet

Parts

Functions

Principle of work

Benefits

Use the following phrases.

- It consists of …

- The main parts are …

- It is made of …

- Its function is to …

- It is of circular / square shape …

- It is driven by …

- It works due to …

- It provides the engine with …

- It prevents / allows to …

- By means of this part …

15. Work in pairs. Think over and discuss the advantages and disadvantages of gas turbine engines. Support your ideas and share with your group mates. Then compare your variants with the information in Appendix A (p. 98) and discuss what point you have not mentioned. Use the following phrases.

- The greatest advantage / The main advantage / The most significant advantage …

- A comparatively minor disadvantage / A completely insignificant disadvantage …

- On the other side of the coin …

- Turning to the other side of the argument …

- We can balance against this …

- Nevertheless / whereas …

- Despite / In spite of …

- Against this I would mention …

- In my view …

- To my mind …

  1. Work in a group. Read the text and discuss the difference between the turbo engine and reciprocating engine. See Appendix a (p. 99). Discuss:

performance;

maintenance;

price;

materials;

benefits.

Then make a conclusion which engine is better. Use the following phrases.

- In contrast to …

- Rather similarly …

- On the contrary …

- In addition to …

- It resembles …

- The same way of …

- It is similar to …

- It differs from …

- With the purpose of …

- In order to …

WRITING

  1. You are going to take a part at a scientific conference. You have to make a report (200-250 words) about modern gas turbine engine. Your report should include the following points:

time of invention;

parts of the engine;

performance;

principle of work;

price;

application.

Use the following phrases.

- The main point of the report is …

- This fact supports the idea of …

- We have already known about

- Another interesting thing to say about is …

- It is clear from the facts that …

- This can be seen in …

- It clarifies the fact that …

- Despite of the fact that …

- In addition / moreover …

- On the whole …