Discussion
Match each quantity in List I with its definition in List II.
List I
A. Specific thrust
B. Thrust specific fuel consumption
C. Bypass ratio
D. Overall efficiency
List II
1. Thrust per unit air mass flow
2. Fuel flow per unit thrust
3. Bypass flow divided by core flow
4. The product of thermal and propulsive efficiency
Select the correct match.
Answer: C
Correct answer: A-1, B-2, C-3, D-4
Four definitions, and the trap is the pair that both begin with thrust. Specific thrust is thrust per unit air mass flow, which sizes the engine. Thrust specific fuel consumption is fuel flow per unit thrust, which is the inverse-looking quantity that measures economy. Bypass ratio is bypass flow over core flow, and overall efficiency is the product of thermal and propulsive efficiency.
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