Deck 61: Tire and Wheel Theory

Question 1

20)On a tire information sticker, the number that comes after the cross-sectional width of the tire is the ____________________, which is a measurement of the height-to-width ratio.

Answer 1

aspect ratio

Question 2

19)A tire information sticker called a(n) ____________________ has been required on cars sold in the United States since 1968.

Answer 2

placard

Question 3

12)The term MOST-Likely used to describe the weight of the vehicle without passengers or luggage but includes a full tank of fuel and all fluids is:

A) plus sizing
B) curb weight
C) drop weight
D) belt weight

Answer 3

B

Question 4

1)A belt is only in the area of a tire under the tread and does not extend under the sidewalls.

Question 5

3)A bias tire is made in a full-circle mold that has two halves, like a bagel cut in half.

Question 6

8)Which of the following will LEAST-Likely have casing plies that cross each other at angles of 35-45 degrees?

A) Bias-ply tires
B) Diagonal tires
C) Cross-ply tires
D) Radial tires

Question 7

2)Hydroplaning is a term used by chemical engineers to describe a rubber's energy absorption characteristics.

Question 8

16)____________________ provide strength to the tire to support the load of the vehicle.

Question 9

10)A tire's height is called its ____.

A) profile
B) traction
C) load index
D) footprint

Question 10

7)All of the following statements are true EXCEPT:

A) pure rubber is a hydrocarbon derived from the latex of a tree grown in all of the subtropical areas of the world.
B) rubber freezes at only 50⁰F and becomes sticky at 86⁰F.
C) rubber swells when contacted by many liquids and is damaged by sunlight.
D) for rubber to be useful, it must be vulcanized by heat to make it stable.

Question 11

9)The term MOST-Likely used to describe the load limit for each of the vehicle's tires under cold inflation is:

A) traction
B) hydroplaning
C) plus sizing
D) load rating

Question 12

18)____________________ are small grooves in the tire tread that look like knife cuts.

Question 13

14)While having a discussion, Technician A says that DOT standards require the overall diameter of a replacement tire to be within +2% to 3% of what the tire was as OE. Technician B says that DOT standards require the overall diameter of a replacement tire to be within +2% to 5% of what the tire was as OE. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 14

11)All of the following statements are true EXCEPT:

A) at high speeds, non-speed-rated tires distort in the sidewall and tread areas.
B) light truck tires run hotter but dissipate heat better than passenger car tires.
C) low-profile tires often have one or more sections of sidewall that extend beyond the flange of an expensive aluminum wheel to protect it from damage when it rubs against a curb.
D) nylon cap plies are extra plies on the sides of the normal tire plies.

Question 15

15)While having a discussion, Technician A says that you should never install undersized tires on a vehicle. The vehicle will be lower, and the speedometer will no longer be accurate. Technician B says that the increase in engine rpm for a given speed will result in a decrease in fuel economy. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 16

6)The ____ is the section of the tire that contacts on the road.

A) tread
B) belt
C) ply
D) sipe

Question 17

17)A tire's ability to grip the road is called ____________________.

Question 18

4)Sidewall deflection allows more of the tread to be in contact with the road surface.

Question 19

13)Which of the following statements is LEAST-Likely true?

A) Snow chains are used in some mountain areas during severe winter weather when roads have become covered with ice and snow.
B) Cable chains are just as effective as conventional chains, but are apt to cause damage due to incorrect installation.
C) A run-flat tire can partly support the vehicle even when the tire is completely empty of air and can be driven up to 70 miles without air before suffering damage.
D) Winter tires can provide better handling in snow than is afforded by four-wheel drive without winter tires.

Question 20

5)Y-rated tires are rated at 168 mph (270 km/h).

Question 21

25)What is the difference between rim width and wheel offset?

Question 22

22)When changing tire sizes, what five things do you need to consider about the replacement tire?

Question 23

23)What is the difference between a lower profile tire and a high-profile tire?

Question 24

24)What is the purpose of a drop center?

Question 25

21)Why do tire companies recommend that heavy RVs be weighed separately at each wheel?