Discussion
Assertion (A): Overall efficiency cannot be improved by thermal efficiency alone.
Reason (R): Overall efficiency is the product of thermal and propulsive efficiency.
Select the correct answer from the options below.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is the whole argument. Because \( \eta_o = \eta_{th}\,\eta_p \), a gain in one factor can be cancelled by a loss in the other. Raising the turbine entry temperature improves the thermal efficiency but also raises the jet velocity, which lowers the propulsive efficiency - so the two must be pursued together, and the bypass ratio is the lever that restores the second.
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