Mechanical Energy and Hydraulic Energy

This and the other two questions you just posted sound like homework.

I'd try a Google search, if your instructor allows it.

Not only these two -- Just check all the questions,

- Started with trying to Qualify AWS ,

- How to control Distortion in welding.

- What is back purging

- what is weight of 1Kg of water

- What is L=4D ...

I am dismayed at the merit of the questions.

Energy obtained by the use of any type of fluid is hydro energy. For example we store water in a dam and allow its energy to run turbine to get mechanical energy. You can refer any basic engineering books to understand these types of concepts.