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‘Hydraulic brakes’ and ‘Hydraulic lift’ are devices in which fluids ar

June 1, 2025 by rawan239

‘Hydraulic brakes’ and ‘Hydraulic lift’ are devices in which fluids are used for transmitting

force

momentum

pressure

power

This question was previously asked in

UPSC CAPF – 2011

Download PDF Attempt Online

‘Hydraulic brakes’ and ‘Hydraulic lift’ are devices in which fluids are used for transmitting pressure.

These devices operate based on Pascal’s Principle, which states that pressure applied to an enclosed fluid is transmitted undiminished to every portion of the fluid and the walls of the containing vessel. In hydraulic systems, a small force applied to a small area (piston) creates pressure in the fluid (Pressure = Force/Area). This pressure is transmitted through the fluid to a larger area (piston), resulting in a larger force output (Force = Pressure * Area). The fluid acts as the medium to transmit this pressure.

While force is transmitted and amplified in hydraulic systems, the fundamental principle at play, enabling the transmission and multiplication of force, is the uniform transmission of pressure throughout the fluid. Work done (Force x Distance) is ideally the same at both input and output ends, neglecting energy losses, but the force and distance are traded off (small input force over large distance results in large output force over small distance).

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