SafetyQuestion 684 of 700
A mobile crane's load chart shows its rated capacity decreasing as the load is moved farther from the crane. What happens to the crane's safe rated capacity as the operating RADIUS increases?
a.It stays the same because the crane's weight does not change
b.It increases because leverage helps the crane
c.It decreases, because a longer radius creates a greater tipping/overturning moment
d.It depends only on wind speed, not radius
Explanation
Correct: as the horizontal distance (radius) from the center of rotation to the load increases, the overturning moment grows, so the crane can safely lift less. That is why load charts list smaller capacities at longer radii. Capacity is not constant, and a longer radius hurts rather than helps stability. Wind is a separate factor and does not replace the radius-capacity relationship.
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