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Which outcome occurs when throttling steam undergoes rapid expansion?

A)Steam temperature decreases significantly
B)Steam superheat increases dramatically
C)Steam pressure remains perfectly constant
D)Steam undergoes isothermal phase transition

💡 Explanation

Throttling occurs via the Joule-Thomson effect, because the steam undergoes adiabatic expansion with no heat transfer, therefore temperature drops as internal energy converts lowering the average molecule kinetic energy, rather than phase transition, change in superheat or constant pressure for different operating contexts.

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