Advantage of Hydraulics: Transmission of large forces using small components.

• A. Flow control valves can be used even in movements independent of load
• B. Start up under heavy load
• C. Transmission of large forces using small components
• D. Low energy consumption

Answer: (C)

Hydraulics can deliver very large forces from relatively small components by using a confined fluid under pressure. The key idea is that the pressure generated by the pump acts on pistons of different sizes, and the output force scales with the piston area: F = p × A. By maintaining high pressure and using a small-diameter cylinder, you can produce a large output force without needing large moving parts. This high force density lets compact hydraulic cylinders, valves, and pumps handle hefty loads, lift heavy objects, or clamp tightly with modest hardware.

For example, a small hydraulic jack can lift a car because the same fluid pressure acts on a larger force-producing area, yielding a substantial output force. The pump supplies the energy, and the force is amplified by the pressure acting on the piston area. This is the central advantage: transmitting and amplifying force through the fluid so that small components can control or deliver large forces.

The other ideas describe useful aspects of hydraulics (like controlling speed with valves or starting under load) but they don’t capture the core benefit of force transmission with small, high-pressure components. Energy use varies with design and losses, so low energy consumption isn’t inherent to hydraulics.