In a hydraulic system, with fixed piston area, how does output force change as pressure increases?

• A. Output force remains the same
• B. Output force doubles
• C. Output force increases in direct proportion to pressure
• D. Output force decreases

Answer: (C)

In a hydraulic system the output force on a piston is determined by F = P × A, where P is the fluid pressure and A is the piston area. If the piston area is fixed, increasing the pressure increases the force by the same factor—therefore the output force changes in direct proportion to the pressure. Doubling the pressure while the area stays the same doubles the force; there’s no constant or decreasing force scenario when pressure rises. This linear relationship comes from how pressure acts uniformly in the fluid and on the piston surface.