Hydraulic Machines Fall Under the Category

Answer: D- Roto-dynamic machinery

Hydraulic machines fall under the category of Roto-dynamic machinery

Solution:

• A roto-dynamic machinery is a machine that converts the kinetic energy of a moving liquid or gas into rotating mechanical energy and vice versa.
• Hydraulic machines like turbines are used to convert the kinetic energy of fluid flow into mechanical energy. 
• Hydraulic machines like pumps are used to convert rotating mechanical energy into fluid pressure and kinetic energy.

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