GERTC Hydraulics, Pneumatics, and Geotechnical Engineering (HPGE) 2025 – 400 Free Practice Questions to Pass the Exam

The primary function of a hydraulic jack is to lift heavy loads using hydraulic force. This mechanism operates on Pascal's principle, which states that when pressure is applied to a confined fluid, the pressure change occurs throughout the fluid in all directions. In a hydraulic jack, a small force applied on a small piston creates a larger force on a larger piston, allowing for the lifting of heavy objects with relative ease. This advantage makes hydraulic jacks essential in various applications, including automotive repair, construction, and loading operations where heavy lifting is needed.

While measuring fluid pressure, controlling fluid flow, or filtering contaminants are important aspects of hydraulic systems, they do not define the primary function of a hydraulic jack. The core purpose of this device centers around its ability to amplify force for lifting, which distinguishes it from other components in hydraulic systems that serve different roles.