True/False (steam nozzles): Compare critical pressure ratios for different steam qualities. Statement: “The critical pressure ratio for initially dry saturated steam is greater than that for initially wet steam.” Decide whether the statement is correct.

ConceptCritical pressure ratio (p₂/p₁) for choking depends on the effective expansion index and thermodynamic properties of the working fluid. With higher dryness fraction (approaching dry saturated), the effective index yields a slightly higher critical pressure ratio than for wetter steam.

ImplicationThus, for the same inlet state, initially dry saturated steam requires a relatively higher p₂/p₁ to choke than initially wet steam.

Final AnswerAgree.