Discussion
Which fault results from assembling a propeller shaft out of phase?
Answer: B
Out of phase yokes leave the speed fluctuations of the two joints adding rather than cancelling, producing a torsional vibration felt through the vehicle. The shaft is marked so that the two halves can be reassembled correctly. It is a common error after a sliding joint is separated. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. The order in which the effects act is what decides the outcome, so it is worth establishing first.
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