🔍 Key Concepts

• Relationship between nozzles and steam pressure drop in an impulse or velocity‑compounded turbine stage • Difference between changes in pressure vs changes in velocity as steam passes through fixed nozzles and moving blades • How the pressure curve in the top graph lines up with the physical components (nozzle, fixed blades, moving blades) shown below

💭 Think About

• Follow the steam absolute pressure curve from left to right and count each distinct region where the pressure actually decreases, not just where components change • Match each pressure change (if any) to the part of the turbine: nozzle, first moving blades, fixed (re‑directing) blades, second moving blades, etc. • Ask yourself: in a velocity‑compounded impulse stage, where should the pressure remain nearly constant and where should it drop?

✅ Before You Answer

• Be sure you are looking at pressure, not the velocity curve, when counting drops • Confirm how many separate nozzle or nozzle-like passages the steam passes through in this single stage • Verify whether the pressure line is flat or sloping downward as it passes each row of moving and fixed blades