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The coefficient of velocity of a nozzle compares

  • A.Gross thrust with net thrust
  • B.Actual exit velocity with the ideal isentropic velocity
  • C.Actual mass flow with ideal mass flow
  • D.Exit pressure with ambient pressure

Answer: B

Friction and heat transfer prevent the expansion being perfectly isentropic, so the exit velocity falls short of the ideal. Because thrust depends directly on that velocity, a small shortfall here translates straight into lost thrust.

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