Which system uses fluid power for mechanical operation?

• A. Hydraulic System.
• B. Pneumatic System.
• C. Electrical System.
• D. Mechanical Linkage Only.

Answer: (A)

Fluid power means using a confined fluid under pressure to move and control mechanical parts. A hydraulic system uses liquid under pressure to push pistons and cylinders, producing force and motion for mechanical operation with strong, controllable performance. While pneumatic systems also use a fluid (air), gases are compressible, making their force less consistent and typically better for lighter, faster actions. Electrical systems rely on electrical energy, not fluid power, and mechanical linkages operate without any fluid. So the hydraulic system is the one that uses fluid power for mechanical operation.