Discussion
A choked orifice is used to meter gas flow in industry chiefly because
Answer: B
Once the orifice is choked, the flow is fixed by the upstream stagnation state and the throat area, so fluctuations downstream cannot disturb it. That insensitivity makes it a stable and repeatable metering device, and the same principle governs rocket motor throats and gas turbine nozzle guide vanes.
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