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High pressure steam is expanded adiabatically and reversible through a well insulated turbine which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS, respectively, for this process:
  • a)
    ΔH = 0 and ΔS = 0
  • b)
    ΔH ≠ 0 and ΔS = 0
  • c)
    ΔH ≠ 0 and ΔS ≠ 0
  • d)
    ΔH = 0 and ΔS ≠ 0
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
High pressure steam is expanded adiabatically and reversible through a...
For reversible adiabatic process, ΔS = 0 but ΔH ≠ 0.
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High pressure steam is expanded adiabatically and reversible through a...
ΔH and ΔS, respectively, then the adiabatic reversible process can be represented as:

ΔH = W
ΔS = 0

In an adiabatic process, there is no heat transfer (Q = 0) between the system and its surroundings. Therefore, the change in entropy (ΔS) is zero.

The enthalpy change (ΔH) across the turbine is equal to the work done by the turbine (W) because there is no heat transfer. This work done is represented by the shaft work produced by the turbine.

So, ΔH = W, which means that the enthalpy change is equal to the work done by the turbine.

The entropy change (ΔS) is zero because there is no heat transfer. In an adiabatic process, the entropy remains constant.

Therefore, the enthalpy change and entropy change across the turbine in this adiabatic reversible process are represented by ΔH = W and ΔS = 0, respectively.
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High pressure steam is expanded adiabatically and reversible through a well insulated turbine which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS, respectively, for this process:a)ΔH = 0 and ΔS = 0b)ΔH≠0 and ΔS = 0c)ΔH ≠ 0 and ΔS ≠0d)ΔH = 0 and ΔS ≠ 0Correct answer is option 'B'. Can you explain this answer?
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