🔍 Key Concepts

• Difference between impulse and reaction turbine stages • Where the pressure drop occurs in impulse vs. reaction designs (nozzles vs. moving blades) • How velocity-compounding and diaphragms/nozzles relate to impulse stages

💭 Think About

• For an impulse-reaction turbine, should the flow see only impulse stages, only reaction stages, or a mix of both? Think about what the name implies. • Ask yourself: in impulse stages, where is most of the pressure drop, and in reaction stages, where is it shared? How would they logically be arranged in one machine? • Look at each choice and decide: is this describing mainly impulse behavior, mainly reaction behavior, or a combination, and in what order?

✅ Before You Answer

• For each option, identify clearly: where does the pressure mainly drop (stationary nozzles, diaphragms, or moving blades)? • Check which option truly combines both impulse and reaction principles in one turbine, not just one or the other. • Verify which terms like velocity-compounded, nozzles, and diaphragms are usually associated with impulse stages.