Discussion
Which phenomenon can a beam axle produce at speed?
Answer: D
A disturbance at one wheel is transmitted to the other through the beam, and the gyroscopic coupling with the steering can produce a self sustaining oscillation. A steering damper is fitted to control it. Worn kingpins and unbalanced wheels both promote it. Naming what changes and what stays the same is the reliable route through questions of this shape. The order in which the effects act is what decides the outcome, so it is worth establishing first. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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