Discussion
Match each engine in List I with the regime it suits in List II.
List I
A. Reciprocating engine
B. Turboprop
C. High bypass turbofan
D. Scramjet
List II
1. Light aircraft at low speed and power
2. Regional operation up to about 400 knots
3. Long range high subsonic cruise
4. Sustained hypersonic flight
Select the correct match.
Answer: D
Correct answer: A-1, B-2, C-3, D-4
The four engines line up in ascending order of speed, which makes the match straightforward: a reciprocating engine and propeller for light aircraft at low speed and power, a turboprop for regional work up to about four hundred knots where the tip speed limit begins to bite, a high bypass turbofan for long range high subsonic cruise, and a scramjet for sustained hypersonic flight.
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