Discussion
A twin spool engine's low pressure shaft runs at 92 per cent of its maximum \( 4200 \ \mathrm{rpm} \) while the high pressure shaft runs at 96 per cent of \( 12\,500 \). Their speeds are
Answer: A
Correct answer: 3864 and 12 000 rpm
\[ 0.92 \times 4200 = 3864\ \text{rpm}, \qquad 0.96 \times 12\,500 = 12\,000\ \text{rpm.} \] The two percentages differ because the shafts are independent: each settles where its own work balance and flow continuity put it, so there is no fixed relationship between the two figures.
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