Discussion
Fuel flow rises from \( 0.30 \ \mathrm{kg/s} \) at idle to \( 1.20 \ \mathrm{kg/s} \) at take-off while airflow rises from 15 to \( 60 \ \mathrm{kg/s} \). The overall air-fuel ratio
Answer: B
Both quantities have risen by the same factor of four, so the ratio is unchanged at 50 to 1. Real engines do not hold it constant, and the way it varies across the range is what makes idle and take-off such different combustion problems.
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