Front Axle and Steering Systems Questions and Answers

Answer: A

Grasping the wheel at the three and nine o'clock positions and rocking reveals play in the steering linkage. Rocking at twelve and six reveals bearing and suspension play instead. An assistant watching the joint identifies exactly which one is loose. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Checking which component actually carries the load settles most questions of this kind at once.

Answer: B

The taper is drawn home by the nut, which is then locked by a split pin or is of the self locking type. A plain nut would loosen and the joint would separate. Separation of a steering joint is a catastrophic failure. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.

Answer: C

A splitter forces the taper out, or a sharp blow to the side of the eye with a hammer releases it by momentarily distorting the bore. The hammer method preserves the boot if the joint is to be reused. A chisel damages the components. Most errors here come from carrying across a result from a neighbouring case where it does not hold. The shared behaviour explains why these belong together and the differences explain why both exist. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

Answer: D

A taper locks by friction, so oil or grease on the surfaces prevents it from gripping and the joint works loose. Both surfaces are cleaned before assembly. Lubricating a taper is a common and dangerous error. Naming what changes and what stays the same is the reliable route through questions of this shape. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.

Answer: A

The column runs in bearings within a tube supported from the bulkhead and the fascia, and the tube is designed to collapse in a frontal impact. Universal joints permit the change of angle between the column and the rack. The collapsible feature is a significant safety provision. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

Answer: B

A mesh or ball bearing section collapses under axial load, preventing the column from being driven back into the driver during a frontal impact. The airbag works in conjunction with it. Before its introduction the column was a notorious cause of chest injury. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Naming what changes and what stays the same is the reliable route through questions of this shape. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

Answer: C

A spring loaded bolt operated by the ignition switch engages a slot in the column shaft, locking the steering. Electronic locks operated by the immobiliser have replaced it on many vehicles. The lock is a legally required security feature. The order in which the effects act is what decides the outcome, so it is worth establishing first. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Checking the units of each quantity catches a wrong formula before the arithmetic begins.

Answer: D

Removing the key allows the lock to engage, leaving the towed vehicle unable to steer, which is why the ignition must be left on during a tow. Doing so also releases the brake servo and the power steering assistance, which the driver must anticipate. Checking which component actually carries the load settles most questions of this kind at once. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

Answer: A

Without the engine driving the pump there is no assistance and the effort at the wheel rises substantially, particularly at low speed. The brake servo is lost for the same reason. Both must be anticipated by anyone steering a towed vehicle. Tracing the requirement back to the physical constraint that produces it makes the answer follow. The order in which the effects act is what decides the outcome, so it is worth establishing first. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.

Answer: B

A ratio of sixteen to one means the steering wheel turns sixteen degrees for each degree at the road wheel. Turns lock to lock depends on the ratio and the available lock together, so it is related but not equivalent. Lower ratios give quicker steering and higher effort. The shared behaviour explains why these belong together and the differences explain why both exist. Checking which component actually carries the load settles most questions of this kind at once.