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The mass flow through a choked nozzle is doubled. This could have been achieved by

  • A.Doubling the stagnation pressure at constant stagnation temperature
  • B.Halving the back pressure
  • C.Doubling the exit area while leaving the throat unchanged
  • D.Doubling the back pressure

Answer: A

Once choked, the mass flow depends only on the stagnation state and the throat area, and it is proportional to stagnation pressure at fixed stagnation temperature. Back pressure has no effect at all, and enlarging the exit changes the exit Mach number rather than the flow passing the throat.

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