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In an adiabatic nozzle the enthalpy drop appears as

  • A.heat rejected outward through the nozzle wall
  • B.an increase in the static pressure of the stream
  • C.an increase in kinetic energy of the stream
  • D.shaft work delivered out to the surroundings

Answer: C

A nozzle has no moving parts, so no shaft work is possible and the energy released by falling enthalpy can only accelerate the fluid. The pressure falls rather than rises, which is what makes the acceleration possible.

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