P43-Database-ENG

Which statement about caster is correct in relation to axle geometry?

• A. Caster has no effect on the stability of straight-ahead tracking.

• B. The caster is the tilt of the steering axis when viewed from the front of the vehicle.

• C. The caster influences positive scrub radius so that the braking force produces better grip at both wheels, on a road surface with different frictional coefficients.

• D. Caster is the forward or rearward tilt of the steering axis when viewed from the side of the vehicle.

Which statement about camber is correct in relation to axle geometry?

• A. Camber describes the inward or outward tilt of the wheel when viewed from above.

• B. Camber is the distance from the center of tire contact patch to the point where the steering axis reaches the road surface.

• C. Camber is the inward or outward tilt of the wheel when viewed from front.

• D. Camber is the forward or rearward tilt of the steering axis when viewed from the side.

Which statement regarding scrub radius is correct in the context of axle geometry?

• A. The scrub radius is the angle of the wheel center line that runs from the tire contact of a wheel to a line at a 90° angle to the geometric driving axis.

• B. The scrub radius is the distance between the point where the centerline of the wheel, viewed from the front, contacts the road, and where SAI contacts the road.

• C. The scrub radius is the angle in which the rear axle has a tendency of steering the vehicle when moving straight ahead.

• D. The scrub radius is the angle between the direction the tire is pointed in a turn, and the actual direction of travel.

Technician A says no matter which suspension and steering design is used, one of the most important things is that it maintains proper tire contact patch as the vehicle maneuvers. Technician B says excessive camber will cause excessive tire wear around the inside or outside edge of the tire tread, depending on the exact angle. Who is correct?

• A. A only

• B. B only

• C. Both A and B

• D. Neither A nor B

Which statement regarding toe is correct in the context of axle geometry?

• A. Toe is the inward or outward angle of the wheel when viewed from above.

• B. Toe is the inward or outward tilt of the wheel when viewed from the front.

• C. Toe is the forward or rearward tilt of the steering axis when viewed from the side.

• D. Toe is the angle between the direction the tire is pointed in a turn and the actual direction of travel.

Which of the following statements is NOT true in relation to the vehicle geometric centerline

• A. Geometric centerline marks the center of the vehicle from front to back when viewed from above.

• B. Geometric centerline is another term for the center of gravity.

• C. Ideally, the thrustline should match the geometric centerline.

• D. It is a fixed reference point used by the alignment machine for calculating some angles and adjustments.

Which statement describes understeer?

• A. The vehicle pushes forward with a loss of traction at the front wheels in a turn.

• B. The rear of the vehicle pushes outward laterally with a loss of traction in a turn.

• C. The front of the vehicle pushes inward laterally with a loss of traction in a turn.

• D. The rear of the vehicle pushes inward with a loss of traction while accelerating.

Which statement describes oversteer?

• A. The vehicle pushes forward with a loss of traction at the front wheels in a turn.

• B. The rear of the vehicle pushes outward laterally with a loss of traction in a turn.

• C. The front of the vehicle pushes inward laterally with a loss of traction in a turn.

• D. The rear of the vehicle pushes inward with a loss of traction while accelerating.

What is the meaning of the term kinematics when discussing chassis systems performance?

• A. The spatial movement of the wheels in relation to the vehicle body during suspension and steering movements.

• B. The arrangement of the subframe for the purposes of absorbing vibrations.

• C. The spatial tuning of the steel springs in relation to the elasticity forces of the chassis in the event of lateral and longitudinal movements.

• D. The static positioning of suspension system components that is checked during wheel the wheel alignment process.

Technician A says that poly-urethane bushings can be used to effectively upgrade a Porsche suspension system and improve handling. Technician B says too much positive caster will cause excessive tire wear on the inside edge of the tire. Who is correct?

• A. A only

• B. B only

• C. Both A and B

• D. Neither A nor B