# Servicing Wheels And Tires

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Chapter 27

• 1.

### True or False. A tire valve is a specially designed opening that allows a tire to be inflated and then automatically closes to prevent air from escaping.

• A.

True

• B.

False

A. True
Explanation
The valve stem is a one way valve that allows the air pressure to be trapped inside the tire.

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• 2.

### During cornering, centrifugal force acts on a vehicle to produce:

• A.

Under-steer.

• B.

Side force.

• C.

Over-steer.

• D.

Slip angle.

B. Side force.
Explanation
The force that moves you to the side of a vehicle while turning is called side force.

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• 3.

### True or False. A tire with an A temperature rating has the best temperature resistance.

• A.

True

• B.

False

A. True
Explanation
"A" is the highest temperature rating for a tire.

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• 4.

### True or False. Over inflation of a tire causes excessive wear on the outer edges of the tread.

• A.

True

• B.

False

B. False
Explanation
Over inflation causes the tire to peak. The result is a tire that rides mostly on the center part of the tread, and wearing that part more quickly.

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• 5.

### True or False. Tires and wheels must be balanced statically and dynamically.

• A.

True

• B.

False

A. True
Explanation
There are two forms of tire inbalance. Static is on one plane; dynamic inbalance is on 2.

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• 6.

### True or False. When checking air pressure, always refer to the tire sidewall, because this is the most accurate air pressure reading.

• A.

True

• B.

False

B. False
Explanation
The tire sidewall provides the maximum pressure for the tire. Vehicles each have their own specific tire pressure.

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• 7.

### True or False. When a radial tire bulges on the sidewall, this means that the tire is underinflated all the time.

• A.

True

• B.

False

B. False
Explanation
A bulge on the side of a tire indicates a broken belt on the inside of the tire.

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• 8.

### True or False. The DOT number on a tire tells the technician the exact date the tire was made, to the minute.

• A.

True

• B.

False

B. False
Explanation
The DOT date indicates the week of year, and the year a tire was manufactured.

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• 9.

### Technician A says that paying attention to tires and wheels can also assist in identifying problems in the steering system. Technician B says that paying attention to tires and wheels can also assist in identifying problems in the suspension system. Who is correct?

• A.

Tech A

• B.

Tech B

• C.

Both Techs A and B

• D.

Neither Tech A nor B

C. Both Techs A and B
Explanation
Steering angles that are out of specification will result in abnormal tire wear. Worn suspension parts will also result in abnormal tire wear, but in a different way than out of spec steering angles.

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• 10.

### The height of the center of gravity is determined by the ___________ of the center of the mass above the road surface.

• A.

Height

• B.

Depth

• C.

Width

• D.

Length

A. Height
Explanation
Center of gravity is a measurement calculated with respect to the height of an object. The height effects the object's relationship to earth's gravity.

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• 11.

### The _________ seat is the edge of the rim that creates a seal between the tire bead and the wheel.

• A.

Rim

• B.

• C.

Wheel

• D.

Disc

Explanation
The bead of a tire is the belt reinforced, inner edge that seals the rubber of the tire to the metal of the rim.

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• 12.

### The tire must be an exact fit on the rim to:

• A.

Ensure the tire and rim will seal the air in a tubeless tire.

• B.

Transfer forces between the tire and wheel without slipping or chafing.

• C.

Prevent the tire from turning on the rim.

• D.

All the above

D. All the above
Explanation
It is important to use the proper tire size for the application doe to all of the listed.

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• 13.

### There are three different wheel offsets: zero offset, positive offset, and negative offset. Technician A says that negative offset places the hub mounting closer to the brake side of the wheel. Technician B says that negative offset is farther away from the brake side of the wheel. Who is correct?

• A.

Tech A

• B.

Tech B

• C.

Both Techs A and B

• D.

Neither Tech A nor B

A. Tech A
Explanation
Negative offset is when the mounting point of the rim is closer to the hub of the vehicle.

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• 14.

### Technician A says that all lug nuts must be torqued. Technician B says that all lug nuts must be properly sequenced. Who is correct?

• A.

Tech A

• B.

Tech B

• C.

Both Techs A and B

• D.

Neither Tech A nor B

C. Both Techs A and B
Explanation
All wheel lugs need to be tightened to specification and done so in a proper sequence.

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• 15.

### The principle that allows your car to stop is:

• A.

Rubber in the tires

• B.

Friction.

• C.

Centrifugal force.

• D.

Ply rating.

B. Friction.
Explanation
Friction is what stops a car, whether it be from between the brake components or the contact of the tire with the road.

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• 16.

### The part of the tire that makes contact with the road is the:

• A.

Cords.

• B.

Plies.

• C.

Inner liner.

• D.

Explanation

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• 17.

### A green valve stem cap on newer tires means that the tires are:

• A.

Green design.

• B.

Filled with nitrogen.

• C.

Filled with helium.

• D.

Filled with hydrogen.

B. Filled with nitrogen.
Explanation
The green cap represents a tire that has been filled with nearly complete nitrogen.

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• 18.

### Technician A says that 98% of the tires sold are of the radial design. Technician B says that 98% of the tires sold are of the bias ply design. Who is correct?

• A.

Tech A

• B.

Tech B

• C.

Both Techs A and B

• D.

Neither Tech A nor B

A. Tech A
Explanation
The vast majority of tires used on vehicles today are of the radial design.

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• 19.

### The aspect ratio of a tire is:

• A.

The width of a tire.

• B.

The rim diameter.

• C.

How much air to inflate the tire to.

• D.

Ratio of height to width.

D. Ratio of height to width.
Explanation
Aspect ratio is the ratio of height of the tire, to its width. It's the second value in a tire's size.

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• 20.

### Technician A says some tire pressure monitoring systems have a sensor mounted in each wheel rim. Technician B says some tire pressure monitoring systems use the wheel speed sensors in the ABS system to detect tire pressure. Who is correct?

• A.

Tech A

• B.

Tech B

• C.

Both Techs A and B

• D.

Neither Tech A nor B

C. Both Techs A and B
Explanation
Some TPMS compare the rotational speed of the tires to compare the size of each. Other TPMS use a sensor in each tire to monitor the pressure or each tire against programmed specifications for tire pressure.

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• 21.

### Technician A says run-flat tires may be driven continually at zero inflation pressure. Technician B says some run-flat tires have sidewall reinforcements. Who is correct?

• A.

Tech A

• B.

Tech B

• C.

Both Techs A and B

• D.

Neither Tech A nor B

B. Tech B
Explanation
Run flat tires are used as a bailout of situations where a vehicle doesn't have room for a spare. They are like any other tire, and need to be inflated to specification. Some of these tires have side wall reinforcement to retain its structure even when there is nearly zero pressure.

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• 22.

### When inspecting tires on the car, you would check for all of the following EXCEPT:

• A.

Wear.

• B.

Inflation pressure.

• C.

Punctures.

• D.

Inner lining damage.

D. Inner lining damage.
Explanation
Inning linings wouldn't be inspected unless the tire were removed from the car and dismounted from the rim.

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• 23.

### Technician A says that tire pressures need to be checked when cold. Technician B says that tire pressures need to be checked before they are driven less than 1 mile. Who is correct?

• A.

Tech A

• B.

Tech B

• C.

Both Techs A and B

• D.

Neither Tech A nor B

C. Both Techs A and B
Explanation
Tire pressures are adjusted when they are cold. Cars that have been driven at least a mile are considered to have hot tires.

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• 24.

### Tires can be balanced by the __________ method.

• A.

Static

• B.

Dynamic

• C.

• D.

All the above

D. All the above
Explanation
All of the above are methods in how we balance wheels.

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• 25.

### Technician A says that a tire will increase or decrease 1 psi for each 10°F of temperature. Technician B says that if the vehicle has been driven to warm the tires, you must adjust the air pressure down to the manufacturer's recommended pressure. Who is correct?

• A.

Tech A

• B.

Tech B

• C.

Both Techs A and B

• D.

Neither Tech A nor B

A. Tech A
Explanation
A tire's pressure will be effected 1psi by a change in 10 degrees F. Tire pressure specifications are given when the tire is cold and should only be adjusted when they are such.

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• Current Version
• Mar 21, 2023
Quiz Edited by
ProProfs Editorial Team
• Nov 03, 2014
Quiz Created by
Atahcpss

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