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 When wet steam undergoes adiabatic expansion then 

 When wet steam undergoes adiabatic expansion then  Correct Answer Its dryness fraction increase or decrease

Explanation:

  • Adiabatic process: It is the thermodynamic process in which there is no exchange of heat and mass between the system and its surrounding during the process.
  • The adiabatic process can be either reversible or irreversible.
  • The essential conditions for the adiabatic process to take place:
    1. ​​The system must be perfectly insulated from the surrounding.
    2. The process must be carried out quickly so that there is no sufficient amount of time for heat and mass transfer to take place.
  • ​​The adiabatic process equation:

​⇒ PVγ = constant  

During adiabatic expansion of wet steam the dryness fraction may decrease due to cooling or may increase due to friction.

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