Choosing the Right Rescue Tool for Heavy Lifting

Which rescue tool is the least stable of jacks and is prone to fail under heavy loads?

Select one: a. Bar screw jack b. Trench screw jack c. Hydraulic jack d. Ratchet-lever jack

Answer:

The rescue tool that is the least stable of jacks and is prone to fail under heavy loads is the Ratchet-lever jack.

The Ratchet-lever jack, unlike hydraulic jacks which utilize an incompressible fluid in a U-tube with pistons on each side, operates based on a ratchet system with mechanical advantage. However, they can be less stable and more likely to fail especially when overloaded or not used properly.

Hydraulic jacks are generally more reliable for heavy-duty work such as lifting cars based on the principle that a small force applied over a small area can balance a much larger force on the other side.

The stability of the Ratchet-lever jack is limited by its design, as it relies on a ratchet mechanism, which can be susceptible to wear and failure under heavy loads. It is important to exercise caution and always follow best practices when using lifting equipment to prevent accidents.