What is the primary purpose of a convergent-divergent nozzle in a turbine?

Study for the Massachusetts 3rd Class Engineer Exam. Access flashcards and multiple choice questions with hints and explanations. Prepare for success on your exam!

The primary purpose of a convergent-divergent nozzle in a turbine is to convert thermal energy of steam into kinetic energy. This type of nozzle plays a crucial role in the functioning of steam turbines. As steam passes through the convergent section of the nozzle, its velocity increases, and in the divergent section, the steam expands, greatly increasing its velocity even further.

The nozzle is designed to accelerate the steam, transforming the thermal energy it possesses into high-speed kinetic energy. This high-velocity steam then impinges on the turbine blades, causing the turbine to rotate and generate mechanical energy.

The other answer options do not accurately reflect the primary function of this nozzle type. While it is true that the convergent-divergent nozzle influences how steam flows and can impact steam pressure indirectly due to changes in velocity, its main role is centered on energy conversion. Similarly, increasing the volume of steam flow and cooling the steam are not inherent functions of the nozzle in the context of turbine operation; rather, they could lead to inefficiencies or operational issues if not managed properly.

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