MLR III S1 Exam

Technician A says a radial ply tire’s belts are sometimes made of steel. Technician B says a radial ply tire’s belts are sometimes made of fiberglass. Who is right?

• A

• B

• Both

• Neither

Technician A says tire markings on the sidewall of a tire give information about a tire’s load-carrying ability. Technician B says tire markings on the sidewall of a tire provide the tire’s speed rating. Who is right?

• A

• B

• Both

• Neither

Technician A says today’s automotive tires use a system of two conjoined inner tubes to hold air pressure and prevent leaks. Technician B says one of the functions of an automotive tire is to provide adequate traction with the road surface. Who is right?

• A

• B

• Both

• Neither

Tire grades and tire markings are being discussed. Technician A says tire tread wear, tire traction, and tire temperature resistance ratings are all part of the Uniform Tire Quality Grading System. Technician B says a tire’s load index is listed as a letter from B to Y on the tire sidewall that correlates to a weight-carrying capacity range of between 1,000–1,500 lb (456–680 kg). Who is right?

• A

• B

• Both

• Neither

Technician A says vehicle manufacturers instruct owners to drive on a compact spare tire in the exact manner as they would drive on a traditional full- size automotive tire. Technician B says run-flat tires are constructed with wear bars that serve as a supplementary protective layer over the tire tread. Who is right?

• A

• B

• Both

• Neither

Tire pressure monitoring systems (TPMS) are being discussed. Technician A says a TPMS is installed only in commercially used vans and trucks in the United States. Technician B says some TPMS give the air pressure reading for each tire on the dash display. Who is right?

• A

• B

• Both

• Neither

Technician A says that depending on the vehicle manufacturer, lug nuts are manufactured with both right-hand threads (turn clockwise to tighten) or left-hand threads (turn counterclockwise to tighten). Technician B says lug bolts are press-fit into the hub or axle flange and can only be removed with manufacturer-specific tools. Who is right?

• A

• B

• Both

• Neither

The basic parts of an automotive wheel bearing are being discussed. Technician A says a wheel bearing’s outer race is sometimes pressed into the automobile’s steering knuckle. Technician B says the bearing’s outer race is sometimes pressed into the hub. Who is right?

• A

• B

• Both

• Neither

Technician A says a steering knuckle is a basic component in a driving hub and wheel bearing assembly. Technician B says the inner stub shaft is a basic component in a driving hub and wheel bearing assembly. Who is right?

• A

• B

• Both

• Neither

The rear tires on a vehicle with independent rear suspension are worn on the inside tread. Which of the following is MOST likely the cause of this condition?

• The toe.
• Underinflated tires.
• The caster.
• None of the above.