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Ram compression becomes sufficient for practical ramjet operation above about

  • A.Mach 6
  • B.Mach 10
  • C.Mach 2
  • D.Mach 0.5

Answer: C

Below that speed the pressure ratio from ram effect alone is too small for a useful cycle. Efficiency climbs steadily above it, which is why ramjets are associated with the Mach 2 to 5 band rather than with any lower speed.

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