Which crane cannot perform its intended lift?

• A. Crane D
• B. Crane C
• C. Crane A
• D. Crane B

Answer: (B)

Crane capacity depends on the combination of load weight, the reach (radius), boom length, counterweight, and how the crane is configured. A lift must stay within the crane’s rated capacity for that exact setup. In this scenario, Crane C cannot perform the lift because, at the required reach and with the given load, the load would exceed its rated capacity or create an unsafe moment that could lead to instability or tipping. That means attempting the lift would violate safety limits, so Crane C is not able to complete the task safely. The other cranes can perform the lift because their configurations or capacities stay within safe limits for the specified load and radius. To verify, you'd check the load moment and capacity curves for the exact setup, confirm wind and ground conditions, ensure proper rigging, and verify outriggers and base are correctly positioned.