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IV. Match the antonyms.

top, great, intake, close, bottom, outward, draw in, inward, exhaust, force out, small, open.

V. Answer the questions.

1. What do engines operate on?

2. How many strokes of the piston are there in one cycle of engine operation?

3. How many outward and inward strokes are there in one cycle?

4. What is an engine stroke?

5. What are the four strokes in one cycle of the internal combustion engine?

6. When does the intake valve open?

7. What draws a mixture of fuel and air into the cylinder?

8. Where does the piston compress the fuel mixture?

9. What ignites the fuel mixture in the combustion chamber of the gaso­line engine?

10. What does the ignited mixture move?

11. When does the exhaust stroke take place?

12. Why do we call this engine a four-stroke-cycle engine?

13. What is the most common type of the internal combustion engine?

VI. Retell the text.

8.

Experimenting with Car Devices

The Continuous Tenses

Chassis

Lead-in

I. Discuss the following questions.

a) Is experimenting important for the development of technology? If so, give your reasons.

b) In what spheres of engineering can people use experiments?

II. Paul and Alex are in the lab now. Listen to their conversation and name the car devices they are working with.

Alex: Hello, Paul! How are you doing?

Paul: Hi, Alex. I'm great, thanks. And you?

Alex: Not bad. What are you doing here?

Paul: Well, I'm studying some car devices. For example, this one is called a tachometer.

Alex: A tachometer? And do you know what it is used for?

Paul: Sure, it is used for indicating the engine speed. It is called a revolution counter. You see, now it is indicating 2500 rpm. It means that the engine is turning over quite fast.

Alex: And what is this instrument? What is it indicating?

Paul: This one is called an ammeter. At the moment it is indicating +10A. when I came in it was indicating +12A.

Alex: Well, I see.

Paul: Will this ammeter be indicating +14A, I wonder? By the way, we are writing a test on car devices tomorrow.

Alex: Really? Then I'm staying with you in the lab.

Paul: OK, then.

III. Complete the dialogues.

A.

B.

A: …

A: …

B: I'm fine, thanks …

B: It is called a tachometer.

A: …

A: What is it used for?

B: I'm studying the car design.

B: …

A: …

A: I see.

C

A: What is this revolution counter indicating now?

B: It means that…

A: …

B: And this ammeter is indicating +12A at the moment.

A: I see.

IV. Match a line in a with a line in b.

1. How are you doing?

a. It is used for indicating the engine speed.

2. What are you doing here?

b. It is a device that is used for measuring current.

3. What is a revolution counter used for?

с. Yes, it is.

4. Are you writing a test tomorrow?

d. We are testing some car devices here.

5. What is an ammeter?

e. I'm excellent, thanks.

6. Is the tachometer indicating 750 rpm now?

f. Yes, that's why I'm staying in the lab.