🔍 Key Concepts

• Impulse turbine vs reaction turbine: where is the pressure drop? • Difference between pressure compounding and velocity compounding in steam turbines • How steam nozzles and multiple rows of blades are used to handle very high inlet steam velocity

💭 Think About

• Ask yourself: in a velocity-compounded impulse turbine, are we splitting the pressure drop or the steam velocity between stages? • Think about how a single pressure drop in nozzles produces a very high-velocity jet—what arrangement of blades is then needed to extract more energy from that jet? • Which option mentions an arrangement that first converts pressure to velocity in (essentially) one step, then uses more than one set of moving blades to gradually reduce that velocity?

✅ Before You Answer

• Identify which choice clearly shows one main pressure stage but more than one velocity (blade) stage • Eliminate any choice that describes multiple pressure stages (that would be pressure-compounded, not velocity-compounded) • Check that the chosen description still matches an impulse turbine (pressure drop mainly in the nozzles, not across the moving blades)