Discussion
An engine indicates 92 per cent rpm at a datum of 12500 rpm. The actual shaft speed is
Answer: D
Correct answer: 11500 rpm
The percentage indication is referred to the datum speed:
\[ N = 0.92 \times 12\,500 = 11\,500\ \mathrm{rpm} \]
The distractor 13587 divides by 0.92 instead of multiplying, giving a speed above the datum for an indication below 100 per cent - an impossibility worth spotting before any arithmetic is done. Percentage display is used because it lets one scale and one set of limits serve engines whose absolute speeds differ widely, low-pressure and high-pressure spools included.
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