UNIT 4 UNDER THE BONNET copy

Unit 4: UNDER THE BONNET


What do these abbreviations means? Work with a
partner to see how many you know.
Brake horsepower
Grams per kilometre
Gasoline Direct Injection
Miles per gallon
Miles per hour
Newton metre
Revolutions per minute
Rear-wheel drive
Spark ignition
Turbo direct injection


Label the diagram with words from the box

Clutch

crankshaft engine gearbox

piston propeller shaft
piston
crankshaf
engine

clutch
gearbox
Propeller shaf

• An engine produces power by burning air and fuel. The fuel
is stored in a fuel tank. (This is usually at the back of the
car.) The fuel tank is connected to a fuel pipe. The fuel pipe
carries the fuel to a fuel pump. The fuel pump is connected
to the carburettor. The fuel pump pumps the fuel into the
carburettor. In the carburettor the fuel is mixed with air.
The fuel and air are drawn into the engine. In the engine
the fuel and air are burned to produce power.


Are these statements true or false?
Correct them if they are false.
1.
2.
3.
4.
5.
6.

An engine produces fuel by burning air and power.
The fuel tank is usually at the back of a car. T
Fuel is stored in a fuel tank. T
The fuel pump pumps fuel to the fuel tank. F
The carburettor is connected to the fuel pump. T
The carburettor mixes fuel and air. T

F

• The power from the engine turns the flywheel. The flywheel
then turns the clutch. The clutch is connected to the gearbox.
The clutch turns the gears in the gearbox. The gearbox is
filled with oil. The gears decrease the speed of the engine.
• The gears turn the propeller shaft. The propeller shaft then
turns the gears in the differential. The differential is also filled
with oil. The gears in the differential turn the half shafts and
the half shafts turn the wheels.


Answer the following questions:
1.
2.
3.
4.
5.
6.

The flywheel turns the clutch.

What does the flywheel turn?
What is connected to the clutch? The clutch is connected to the gearbox.
Where does the clutch turn the gears? In the gearbox.
What do the gears do? the gears decrease the speed of the engine.
Does the propeller shaft turn the gears in the gearbox?No, it doesn't.
What do the half shafts do? The halfshaf turns the wheel.


combustion

fuel

Spark plug
crankshaf

piston
torque
cylinders
clutch

distribution


4. Find words in exercise 3 to complete the table. Use
your dictionary if necessary.
Verb

Noun

Adjective

To ___________
(a)
power

Power

________________(b)
powerful

 

___________________
combustion (c)

combustible

To ___________
(d)
ignite

ignition

 

explode (e)
To ___________

___________________
(f)
Explosion

explosive

To ___________
(g)
rotate

Rotation

________________
(h)
rotational

To ___________
transmit (i)

transmission

 

 
 
 
 
 

 


rotational
transmitted

ignites
explosion
powerful
combustion


2

3

1


Circular
Rectangular
Triangular

spherical

Cuboid

conical

Cylindrical

Square






8. Listen to seven questions customers and match them with the answers (a-g)
given by a technical support hotline employee.

8. Listen to seven questions customers and match them with the answers (a-g)
given by a technical support hotline employee.

g

b

a

e

c

d


9. A potential customer is visiting the stand of a major car manufacturer at an
international car show. Listen to the dialogue and put these key features in the
order in which they are mentioned.

2

6

4
3
7
5
2

10. Now listen again and note down what these numbers refer to.
Engine size in litres
Engine power in brake horse power
Top speed in miles per hour
The new engines available later in the year
Fuel consumption around town in miles per gallon
Fuel consumption for everyday driving
Price in pounds
Wheel size in inches


11. Match the two parts to make sentences from the dialogue (listen again if
necessary).


F

B

A

T

L

U

I

F

U

C O
Y
L
O I L
N
D
T E R
R

O

D
I
E
S
E
L
C

Y

L
A
R

P
I
S
N T
O
A N
C
I
D

K

S
P
A
R
K
P
L
U
G

W
H A
S
H
E
R

F

T