Discussion
Which movement must a propeller shaft accommodate?
Answer: B
As the axle rises and falls the angle between the shaft and the gearbox changes and the straight line distance between the two alters, so both a universal joint and a sliding joint are required. Axle wind up under torque also changes the angle. A rigid connection would fail immediately. Checking which component actually carries the load settles most questions of this kind at once. Most errors here come from carrying across a result from a neighbouring case where it does not hold.
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