🔍 Key Concepts

• Function of the main throttle valve in a steam turbine propulsion system • Order of steam flow path: from boiler, through valves, into turbine components • Purpose of a steam chest and a nozzle diaphragm in controlling and directing steam

💭 Think About

• Trace the path of steam starting at the boiler and think step‑by‑step: after passing through the main throttle valve, where does steam need to go before it can effectively act on the blades? • Which component’s job is to receive high‑pressure steam and distribute it evenly, and which component’s job is to convert that pressure into high‑velocity jets? • Which option would be too far downstream in the flow path for the throttle valve to feed directly, and which option is more of an intermediate space/volume rather than a moving part?

✅ Before You Answer

• Be clear on the sequence: boiler stop valve → main throttle valve → next component → nozzles → blades → exhaust path • Identify which choice represents a volume or chamber that collects steam, not a moving part or a small passage • Verify which component is specifically designed to distribute steam uniformly before it expands through nozzles.