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Assertion (A): A diffuser is analysed with the same equation as a nozzle.
Reason (R): Both exchange enthalpy for kinetic energy with no shaft work and no heat transfer.

  • A.Both A and R are true, and R is the correct explanation of A
  • B.Both A and R are true, but R is not the correct explanation of A
  • C.A is true but R is false
  • D.A is false but R is true

Answer: A

Both are true and the reason gives the reason they pair: the diffuser simply runs the exchange in the other direction, converting velocity back into pressure and enthalpy as the passage widens. The same reduced equation covers both cases.

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