Discussion
Which arrangement cancels that speed fluctuation?
Answer: A
Placing a joint at each end with the yokes in the same plane and the two working angles equal makes the second joint undo exactly what the first did. Unequal angles leave a residual fluctuation that appears as vibration. Correct phasing is why the shaft must be reassembled in its original orientation. 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.
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