Intro to Millwright Practice Exam

Which tool utilizes hydraulic or pneumatic pressure to lift a load?

1. Pneumatic Drill

2. Jack

3. Crane

4. Lever

The correct answer is: Jack

The tool that utilizes hydraulic or pneumatic pressure to lift a load is a jack. Jacks are specifically designed to lift heavy weights by converting the applied pressure into a lifting force. In hydraulic jacks, fluids are used to transmit pressure; when pressure is applied to a confined fluid, it exerts force in all directions, allowing the jack to lift heavy loads with relatively little input force. In contrast, while cranes can lift heavy loads, they typically use mechanical systems and leverage rather than relying solely on hydraulic or pneumatic pressure. Similarly, pneumatic drills focus on creating rotational motion or impact for drilling purposes and are not designed to lift loads. Lever systems operate on the principle of mechanical advantage but do not employ hydraulic or pneumatic principles in their operation.