🔍 Key Concepts

• Impulse turbine basic operating principle • Role of the nozzle vs. the rotor blades in an impulse stage • Where pressure drop and velocity increase occur in an impulse turbine

💭 Think About

• In an impulse stage, ask yourself: in which component does the steam actually expand and gain speed? • What is the specific job of the fixed nozzles compared with the moving blades? • Which choice correctly describes energy changing form (thermal, potential, kinetic) in the part that is stationary?

✅ Before You Answer

• Verify which component in an impulse turbine is responsible for the major pressure drop. • Confirm that in a pure impulse turbine the rotor blades ideally see velocity change but little or no pressure drop. • Eliminate any option that suggests the nozzle prevents steam from expanding or increases pressure before the rotor.