# Auto 09 - The Suspension Is Killing Me!

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Quizzes Created: 5 | Total Attempts: 537
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A quiz on vehicle suspension systems - yippee!

• 1.

### Which of these is not a function of the suspension system?

• A.

Isolate passengers from pot holes & bumps

• B.

To control the direction the vehicle is traveling

• C.

Maintain tire contact with road surface

• D.

Support the weight of the vehicle

B. To control the direction the vehicle is traveling
Explanation
The direction the vehicle is traveling ithe job of the steering system, which has to work with the suspension system.

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• 2.

### Which of these are no longer commonly used as automotive suspension springs?

• A.

Coil springs

• B.

Leaf springs

• C.

Air bags

• D.

Torsion bars

C. Air bags
Explanation
Air bags are still used in some commercial trucks, but not for any current passenger vehicle.

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• 3.

### Control arms are attached to the steering knuckle with a….

• A.

Ball joint

• B.

Urethane bushing

• C.

Sway bar

• D.

Shock absorber

A. Ball joint
Explanation
Keeping the steering geometry functioning while the wheel assembly moves around requires a tough but flexible connection - a ball and socket joint like the ones that allow your legs to move is a good choice of pivoting joint.

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• 4.

### When bounce-testing a car’s suspension, how many times should the car bounce?

• A.

Once or twice

• B.

Three or four times

• C.

None at all

• D.

You shouldn’t bounce-test a car

A. Once or twice
Explanation
Any more than one or two bounces shows that the shock absorbers aren't doing their job.

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• 5.

### Which of these statements about shock absorbers is true?

• A.

Shock absorbers work on the principle of gas displacement

• B.

Shock absorbers reduce the sprung weight of the vehicle 50%

• C.

Shock absorbers absorb shocks

• D.

Shock absorbers support the weight of the vehicle

A. Shock absorbers work on the principle of gas displacement
Explanation
Shock absorbers dampen the shocks (rather than absorb them - the springs do that) by making gasses pass through tiny holes to slow down bouncing.

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• 6.

### Worn sway bar bushings will lead to what?

• A.

Faulty shock absorbers

• B.

Wheel shimmy

• C.

Wheel tramp

• D.

Clunking noises

D. Clunking noises
Explanation
Worn sway bar bushings will let the sway bar rattle around in its mount, causing clunking sounds.

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• 7.

### Regarding tire code: P215/25 R 18. What diameter rims does the tire fit and what type of construction is it?

• A.

25” rims and bias construction

• B.

18” rims and bias construction

• C.

• D.

D. 18” rims and radial construction
Explanation
The last letter "R" means radial construction, and the last number "18" tells the diameter of the rims the tire is meant to be mounted on.

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• 8.

### Regarding tire code: P215/25 R 18. What is the height of the sidewall?

• A.

18 mm

• B.

25 mm

• C.

54 mm

• D.

It can’t be found from the tire code

C. 54 mm
Explanation
The "/25" part of the code tells you that the sidewall height is 25% of the tread width (25% x 215 = 54 mm)

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• 9.

### A treadwear rating of 175 is….

• A.

Considerably better than ‘average’

• B.

Not nearly as good as ‘average’

• C.

An ‘average’ rating

• D.

Not a valid rating

A. Considerably better than ‘average’
Explanation
100 is considered and average rating, 175 is better, 65 is worse.

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• 10.

### How frequently should tires be rotated?

• A.

Once a year

• B.

Every 5 000 km

• C.

Every 10 000 km

• D.

Every 20 000 km

C. Every 10 000 km
Explanation
Twice a year approximately (average annual driving is about 20 000 km). About every second or third oil change.

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