Discussion
A combustor operates at 25 atmospheres at take-off and 5 at high altitude cruise idle. The pressure ratio between the two conditions is
Answer: D
Correct answer: 5
\[ \frac{25}{5} = 5. \] The range matters because combustion behaviour changes with pressure: at the low pressure of high altitude idle the reaction rates fall, the fuel atomises less well and the weak extinction limit narrows, which is precisely why altitude relight is the demanding case rather than take-off.
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