🔍 Key Concepts

• Examine how steam pressure changes across the stages in the upper graph • Compare that with how steam velocity changes across the same stages • Recall the difference between impulse vs reaction stages, and what compounding does (pressure vs velocity)

💭 Think About

• Does most of the steam pressure drop occur in one place (like a nozzle) or is it spread out across several blade rows? • Are multiple rows of moving blades used mainly to use up velocity from a single pressure drop, or to create several separate pressure drops? • Which turbine type has nearly constant pressure across the moving blades but a large change in velocity, and which has pressure drop across both fixed and moving blades?

✅ Before You Answer

• Identify exactly where the major pressure drop occurs in the diagram (nozzle only, or through several rows?) • Check whether the moving blades show mainly a change in velocity or a change in pressure • Match that pattern to the definition of velocity‑compounded impulse, pressure‑compounded impulse, pressure‑compounded reaction, or combination impulse and reaction in your study materials