Discussion
Statement I: Increasing bypass ratio simplifies underwing installation.
Statement II: A higher bypass ratio requires a larger fan and hence a larger nacelle.
In the light of the above statements, choose the correct answer.
Answer: B
Correct answer: Statement I is incorrect but Statement II is correct
Statement I is incorrect: raising bypass ratio makes underwing installation harder, not simpler.
Statement II is correct and is precisely why. A higher bypass ratio requires a larger fan, and the nacelle grows with it - frontal area rising with the square of the diameter. Under a low wing that runs directly into the ground clearance limit, and it has driven flattened nacelles, longer landing gear and engines moved forward and up on the pylon.
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