Discussion
Which limitation determines the maximum length of a single shaft?
Answer: D
A shaft has a natural frequency of lateral vibration, and above the corresponding rotational speed it bows outward violently. The critical speed falls as the square of the length. Torsional strength is essentially unaffected by length. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Checking which component actually carries the load settles most questions of this kind at once.
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