OSHA 30 Hour Construction Program Practice Test

What risk is associated with using extensions and jibs on cranes?

1. It increases lifting speed

2. It can destabilize the crane

3. It enhances visibility

4. It reduces operator fatigue

The correct answer is: It can destabilize the crane

Using extensions and jibs on cranes introduces a significant risk of destabilizing the crane. When extensions or jibs are added, they effectively alter the crane's center of gravity and the distribution of loads. This alteration can lead to an increased risk of tipping, particularly if the crane is not properly configured or if the load exceeds the prescribed limits. The dynamics of lifting change with extensions, as the load is positioned farther away from the base of the crane, which can create a leverage effect that can compromise the crane's stability. Operators must be vigilant and adhere to safety protocols, including using the specific load charts and ensuring that the crane is set up on stable ground to mitigate these risks. In contrast, while increased lifting speed, enhanced visibility, and reduced operator fatigue may present benefits in various contexts, they do not address the crucial concerns of stability and safety when using extensions and jibs with cranes.