Exercise 22. Make the sentences complete.

1. In order to propel an airplane through the air …

2. This force must be rather intensive and …

3. Every propulsion system consists of ….

4. The engine is the …

5. Any aircraft propulsion system must meet ….

6. The total weight of the airplane can be divided among …

7. One of the main problems is receiving …

8. Both in the past and today the desig­ners work at the problem of getting …

9. Flexibility is the ability of the engine …

10. The engine is to have a long life with …

11. Overall propulsion system reliability is increased by …

12. Reliability is determined by the length of time ….

13. Any engine must …

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Exercise 23. Answer the questions.

1. What is required to propel an airplane through the air?

2. What does the propulsion system consist of?

3. What is the fuel?

4. What is the engine?

5. What requirements must the propulsion system meet?

6. How is the total weight of an airplane divided?

7. What are the main problems dealt with the engine?

8. What is the specific fuel consumption?

9. How can one increase the reliability of the propulsion system?

10. What types of engines are there nowadays?

Exercise 24. Speak about the propulsion system using the key-words.

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1. To propel an aircraft

the force is required

the force is provided by

2. The propulsion system consists of …

the fuel is …

the engine is …

3. The propulsion system must meet the requirements:

low weight

high reliability

low cost

4. The total weight of an airplane can be divided among…

The payload consists of…

The weight of the propulsion system can be divided between …

5. There are many problems considered in the engineering field:

receiving the maximum possible power for …

getting lower specific fuel consumption

flexibility of the engine

engine reliability

the problem of balance

carrying away excess heat

6. There exist many types of engines. They are …

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Exercise 25. Make questions to the underlined words.

1. In order to propel an airplane through the air the force is required.

2. This force is provided by the propulsion system.

3. The fuel is the energy source.

4. The total weight of the airplane is divided among the airframe, the propulsion system and the payload.

5. Overall propulsion system reliability is increased by using more than one engine.

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Exercise 26. Make up the dialogue using the key-words of exercise 17 and the conversational phrases.