a) better handling
b) better tread life
c) better fuel economy
d) all of the above
2. The simplest way to improve tire performance and life is to make sure every tire is properly inflated all the time:
a) true
b) false
3. Tire pressures should always be checked when the 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
4. 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
5. A truck tire can lose air pressure even without a leak due to air passingthrough 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
6. Tire pressures for a tractor are taken and recorded. All tires are 10 psi below fleet specification. This may indicate all of the following except:
a) driver may have adjusted psi
b) one tire has a leak
c) tire gauge was not calibrated
d) tires have not been checked recently
7. Wheels should be checked for:
a) cracks
b) rust and/or corrosion
c) missing lug nuts
d) all of the above
8. A blue triangle on the sidewall of a tire indicates a section repair. If there is a bulge at the repair:
a) notify the dealer that the repair is improper
b) a bulge is okay, but cannot be more than 1" wide by 3" high
c) check the height of the bulge with a bulge gauge and reject
if greater than 3/8" in height
d) none of the above
9. Cross rotating (x’ing) the drive tires may be helpful in extending overall mileage because:
a) it may help equalize heel/toe irregular wear patterns and equalize wear rates between front and rear drive axles on tandem vehicles
b) do not cross rotate radial tires, it may damage the belts
c) cross rotation will not help if the irregular wear pattern has already developed
d) none of the above
10. Duals should be matched in tire pressure, size, tread pattern, and tread depth. Match dual tire to:
a) 1/4" diameter (4/32" tread depth)
b) 3/4" diameter
c) 1" circumference on bias and 1/2" circumference on radials
d) none of the above
11. If both tires on a dual assembly have flat spots, it may help minimize ride disturbance and irregular wear to ‘clock’ the tires so the flat spots are:
a) approximately 90 degrees apart
b) approximately 120 degrees apart
c) approximately 180 degrees apart
d) approximately 270 degrees apart
12. A tractor/trailer combination tends to ‘pull’ when the drive axle is misaligned:
a) true
b) false
13. A tractor/trailer combination tends to ‘wander’ when the when the drive axle is misaligned:
