Suspension Systems Questions and Answers

Answer: A

A leaking bellows or valve lets the vehicle sink overnight and forces the compressor to run repeatedly, which eventually burns it out. Soapy water finds the leak. Compressor failure from an unrepaired leak is the expensive secondary consequence. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.

Answer: B

Disconnecting the bar lets one wheel drop far below the other, which keeps all four wheels on the ground over broken terrain. It is reconnected for road use, where roll control is needed. Electronic disconnecting bars automate it. The order in which the effects act is what decides the outcome, so it is worth establishing first. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.

Answer: C

Articulation is the ability of one wheel to rise while the other falls, which requires long travel and a soft or disconnected anti-roll bar. A stiff bar is precisely what prevents it. Live axles articulate better than independent layouts. Checking which component actually carries the load settles most questions of this kind at once. The order in which the effects act is what decides the outcome, so it is worth establishing first.

Answer: D

Long travel demands soft springs and a tall body, so on road handling suffers and the roll angle grows. It is why off road vehicles handle poorly on tarmac. Adjustable systems attempt to have both. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Checking which component actually carries the load settles most questions of this kind at once.

Answer: A

Because the rubber cannot slip on its sleeves, whatever angle the arm is at when the bolt is tightened becomes the bush's neutral position for life. Clamping at full droop leaves it permanently twisted, so the reason explains the instruction exactly. The shared behaviour explains why these belong together and the differences explain why both exist. Tracing the requirement back to the physical constraint that produces it makes the answer follow.

Answer: B

The bar does reduce roll, but over a single wheel bump it twists and therefore stiffens that wheel rather than softening it. Its effect on single wheel inputs is the recognised cost of fitting one. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. The shared behaviour explains why these belong together and the differences explain why both exist.

Answer: C

The first two are correct, but the nitrogen charge exists to prevent cavitation rather than to carry load. A monotube does contribute a small force from its rod area, which is why the third statement is tempting rather than absurd. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

Answer: D

A spring chosen to carry the full payload is far too stiff for the empty vehicle, which is the classic commercial vehicle ride complaint. Progressive or air springs address it. Failed dampers produce float rather than harshness. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

Answer: A

A steel wheel is heavier than an equivalent alloy, so fitting one increases unsprung mass rather than reducing it. The other three all move weight off the wheel or remove it entirely. Inboard brakes are the most dramatic reduction available. Naming what changes and what stays the same is the reliable route through questions of this shape. Most errors here come from carrying across a result from a neighbouring case where it does not hold.

Answer: B

The damper forces fluid through restrictions and the work done appears as heat, which is what stops the spring oscillating. The everyday name shock absorber describes the spring's job rather than the damper's. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Naming what changes and what stays the same is the reliable route through questions of this shape.