Discussion
Match each engine in List I with its defining feature in List II.
List I
A. Turbojet
B. Turbofan
C. Ramjet
D. Rocket
List II
1. All thrust from the core exhaust jet
2. A fan accelerating a large bypass flow
3. Ram compression with no rotating machinery
4. Carries its own oxidiser
Select the correct match.
Answer: B
The four differ chiefly in how much air they accelerate and by how much, which is what sets the flight regime each suits. Only the last dispenses with the atmosphere altogether, at the cost of carrying its oxidiser with it.
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