A truck crane, with outriggers properly set, is rated at what percentage of its tipping capacity?

The correct answer indicates that a truck crane with properly set outriggers is rated at 85% of its tipping capacity. This percentage reflects the enhanced stability provided by the outriggers, which extend the crane's operational footprint and reduce the likelihood of tipping when lifting loads.

Having outriggers properly deployed distributes the load and increases the crane's stability by lowering the center of gravity and providing a wider base. This allows the crane to lift heavier loads safely compared to its tipping capacity when the outriggers are not used. Thus, operating at 85% of its tipping capacity ensures that the crane remains within safe operational limits while maximizing its lifting capabilities.

The other percentage choices (75%, 90%, 100%) do not reflect the standard safe operational guidelines for cranes with deployed outriggers, which emphasize the importance of maintaining a buffer to prevent tipping during operations. Operating at or beyond maximum capacity without accounting for safety factors can lead to dangerous situations, making the 85% rating the most prudent option for ensuring stability and safety during crane operations.