Discussion
Statement I: High bypass engines lose net thrust with flight speed faster than turbojets.
Statement II: Their exhaust velocity is closer to the flight speed, so the increment shrinks more quickly.
In the light of the above statements, choose the correct answer.
Answer: C
Correct answer: Both Statement I and Statement II are correct
Both are true and the second explains the first. Thrust depends on the increment \( V_e - V_0 \). A turbojet with an exhaust at 800 m/s loses a modest fraction of that increment when the aircraft flies at 250 m/s; a high bypass engine whose exhaust is at 350 m/s loses a far larger fraction. The lapse with speed is therefore much steeper - which is exactly why high bypass engines suit subsonic transports and not fast aircraft.
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