Discussion
An expansion fan takes a flow from \( M = 2 \) to \( M = 3 \). The stagnation pressure ratio across it is
Answer: B
An expansion fan is isentropic, so the stagnation pressure is unchanged and the ratio is exactly one. The value 0.213 is the static pressure ratio, and 0.721 belongs to a normal shock at Mach 2; mixing them up is the standard trap in a question of this shape.
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