Which best describes a hydraulic system?

Which best describes a hydraulic system?

• A. A system using compressed air to power tools and control doors
• B. High pressure liquid power; used in elevators and train brakes
• C. A system that stores energy magnetically
• D. A system that converts mechanical energy to light

Answer: (B)

Hydraulic systems use fluid under pressure to transmit power and control motion. Because the liquid is nearly incompressible, pressure applied at one point is transmitted throughout the system, allowing small inputs to produce large, controllable forces on pistons and cylinders. This makes hydraulics ideal for lifting, braking, and precise linear actuation. The description that best fits this is high-pressure liquid power used in elevators and train brakes, which are classic hydraulic applications where strong, smooth force is required. The other options describe pneumatics (compressed air), magnetic energy storage, or converting mechanical energy to light, which are not hydraulic systems.

Hydraulic systems use fluid under pressure to transmit power and control motion. Because the liquid is nearly incompressible, pressure applied at one point is transmitted throughout the system, allowing small inputs to produce large, controllable forces on pistons and cylinders. This makes hydraulics ideal for lifting, braking, and precise linear actuation. The description that best fits this is high-pressure liquid power used in elevators and train brakes, which are classic hydraulic applications where strong, smooth force is required. The other options describe pneumatics (compressed air), magnetic energy storage, or converting mechanical energy to light, which are not hydraulic systems.