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A turbofan engine with an inlet air mass flow of 300 kg/s and a bypass mass flow of 250 kg/s has a bypass ratio of:
  • A
    1.2
  • B
    5
  • C
    2.2
  • D
    6

Use the following formulas:
HP compressor mass flow = inlet mass flow – bypass mass flow
Bypass ratio = bypass mass flow / HP compressor mass flow

HP compressor mass flow = 300 kg/s – 250 kg/s = 50 kg/s
Bypass ratio = 250 kg/s / 50 kg/s = 5

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