A hydraulic system is defined as which of the following?

• A. System Using Fluid Power for Mechanical Operation.
• B. System Using Air Pressure for Pneumatic Tools.
• C. Electrical Control System.
• D. Mechanical Linkage Only.

Answer: (A)

The main idea here is that a hydraulic system uses fluid power to perform mechanical work. Liquids transmit pressure efficiently, so when a pump pressurizes the fluid, that pressure is conveyed to pistons or motors, producing controlled and often strong linear or rotary motion. This setup—pump, reservoir, valves, lines, and actuators—allows small input forces to generate large output forces with precise control. The other options describe different ways to power motion: using compressed air (pneumatic) instead of liquid, an electrical control system that relies on electricity rather than fluid pressure, or a purely mechanical linkage that has no fluid power at all. So, a hydraulic system is defined by using fluid power for mechanical operation.