Massachusetts Hoisting License Practice Test

As the boom is lowered, what happens to the leverage of the load on the crane?

1. It remains constant

2. It decreases

3. It increases

4. It fluctuates

The correct answer is: It decreases

When the boom of a crane is lowered, the effective leverage of the load decreases. This occurs because leverage is a function of the distance from the pivot point (the crane's pivot) to the point of application of the force (the load). As the boom angle decreases and is lowered, that distance shortens, reducing the leverage exerted by the load on the crane. Lowering the boom may also result in better stability for the crane, as a lower position often brings the center of gravity closer to the base of the crane, thereby decreasing the moment created by the load. Understanding this concept is crucial for safe crane operations, as increased leverage can lead to tipping or overload situations, while decreased leverage enhances stability. In contexts where crane operations are assessed, this relationship between boom angle and leverage is an essential factor in planning lifts and ensuring safety protocols are adhered to.