Discussion
Assertion (A): A high bypass engine must be physically larger for a given thrust.
Reason (R): Raising the bypass ratio lowers the specific thrust.
Select the correct answer from the options below.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is the cause. Specific thrust is thrust per unit mass flow, so lowering it means more air is needed for the same thrust, and more air means a larger fan and a larger nacelle. That is the price of the high bypass ratio - more weight, more drag and more ground clearance trouble, all accepted for the fuel saving.
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