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Which of the following would not follow from raising the bypass ratio?

A higher specific thrust

Lower fuel consumption

A larger nacelle and more drag

Reduced jet noise

  • A.A higher specific thrust
  • B.Lower fuel consumption
  • C.A larger nacelle and more drag
  • D.Reduced jet noise

Answer: A

The other three are the recognised consequences of moving more air more slowly. Specific thrust falls rather than rises, which is exactly why a high bypass engine must be physically larger to produce the same total thrust.

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