Discussion
An engine has a thermal efficiency of 0.45 and a propulsive efficiency of 0.70. Its overall efficiency is
Answer: B
Overall efficiency is the product, \( 0.45 \times 0.70 = 0.315 \). Because the two multiply, a weakness in either one caps the result, which is why the turbofan pursued propulsive efficiency without giving up the thermal efficiency of its core.
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