The nozzle assembly in an impulse turbine performs which function?

Prepare for your Marine Engineering Exam with our engaging and informative quiz. Test your knowledge with multiple-choice questions, detailed explanations, and hints. Set sail towards success!

Multiple Choice

The nozzle assembly in an impulse turbine performs which function?

The nozzle in an impulse turbine is there to turn steam pressure energy into kinetic energy by accelerating the steam to a high velocity and directing that jet onto the rotor blades. As the steam expands through the nozzle, its static pressure falls while its velocity rises, creating a high-speed jet that delivers impulse to the blades when it strikes and is deflected. This is how energy is transferred from the steam to the rotor. It’s not about increasing pressure and it isn’t primarily about extracting energy by friction; those don’t describe the nozzle’s role. A temperature drop happens as a consequence of expansion, but the main purpose is to produce a high-velocity, directed jet to transfer momentum to the blades.

The nozzle in an impulse turbine is there to turn steam pressure energy into kinetic energy by accelerating the steam to a high velocity and directing that jet onto the rotor blades. As the steam expands through the nozzle, its static pressure falls while its velocity rises, creating a high-speed jet that delivers impulse to the blades when it strikes and is deflected. This is how energy is transferred from the steam to the rotor.

It’s not about increasing pressure and it isn’t primarily about extracting energy by friction; those don’t describe the nozzle’s role. A temperature drop happens as a consequence of expansion, but the main purpose is to produce a high-velocity, directed jet to transfer momentum to the blades.

More practice questions