2. Tires with too little air pressure:

a) can change handling characteristics and reduce wet traction
b) will not effect tire performance
c) can cause a wheel alignment change
d) increase the risk of impact damage

3. Tires with too much air pressure:

a) reduce the risk of impact damage
b) cause the vehicle to ‘wander’
c) increase the heat build in the tire
d) increase the risk of impact damage

4. When checking air pressures you should use:

a) calibrated tire billy
b) visual inspection only during pre-trip
c) professional bulge gauge
d) tire pressure gauge

5. Tire pressures should always be checked when tires are cold. Heat causes air pressures to increase. How long does it take for a tire coming off the road to cool down for an accurate air pressure reading?

a) 30 minutes
b) 1 - 2 hours
c) 2 - 3 hours
d) 3 - 4 hours

6. A tire is considered ‘flat’ if:

a) it is 20% or more below recommended pressure
b) the height of the tire is 50% or less of the tire when properly inflated
c) the measured tire is between 0 & 10 psi below the reading in the other tires
d) there is no definition for a ‘flat’ tire

7. A truck tire can lose air pressure even without a leak due to air passing through the casing. A typical truck tire can lose:

a) 1 psi per month
b) 2 psi per month
c) 4 psi per month
d) 10 psi per month

8. If there is a blue triangle next to a sidewall bulge it:

a) indicates the tire has a section repair and is okay to use
b) indicates the tire may not be used at speeds above 55 mph
c) indicates the tire is permitted to be used in trailer service only
d) none of the above

9. Wheels should be checked for:

a) cracks
b) rust and/or corrosion
c) missing lug nuts
d) all of the above

10. A certain number of tread cuts are normal but:

a) do not operate the tire if there are more than 2 cuts in any part of the tread
b) tread cuts are not permitted by DOT regulation
c) report any tire showing cuts to the steel

11. A tractor/trailer combination tends to ‘pull’ when the drive axle is misaligned:

a) true
b) false

12. A tractor/trailer combination tends to ‘wander’ when the drive axle is misaligned:

a) true
b) false

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