Red Seal Mobile Crane Operator Practice Exam

Which factors can affect a crane's load capacity?

1. Weather, operator experience, and equipment color

2. Radius, boom angle, crane configuration, and ground conditions

3. Max speed, fuel efficiency, and maintenance records

4. Load height, total boom length, and insulation value

The correct answer is: Radius, boom angle, crane configuration, and ground conditions

The factors that can significantly impact a crane's load capacity include radius, boom angle, crane configuration, and ground conditions. The radius refers to the horizontal distance from the center of the crane’s rotation to the load. As the radius increases, the capacity typically decreases because a greater load at a longer distance can put more stress on the crane's structure. The boom angle plays a crucial role as well. A steeper angle usually means less load capacity due to the increased leverage exerted on the crane structure. The optimal angle allows for maximum load handling, and it's essential for operators to understand how altering the boom angle can affect the crane's capacity. Crane configuration includes the setup of the crane itself, such as whether it's configured with extra counterweights or designed for particular lifting applications. Different setups can enhance stability and increase load capacity. Ground conditions are critical because if the base where the crane is placed is weak or unstable, it can affect the crane's ability to handle the specified load safely. Ground conditions must always be evaluated before operations to ensure that the crane will remain stable during the lift. These factors directly influence the safety and performance of the crane, making understanding them vital for any mobile crane operator.