If the jib angle offset reduces capacity, which statement is true?

If the jib angle offset reduces capacity, which statement is true?

• A. The capacity increases with offset
• B. The capacity decreases with offset
• C. The capacity stays the same
• D. The capacity is unpredictable

Answer: (B)

When lifting, the amount the crane can safely hoist is limited by the load moment about the base. Offsetting the jib moves the load away from the crane’s centerline, creating a longer lever arm. That larger lever arm means the same weight produces a bigger moment, so the crane must carry less weight to stay within safe limits. So capacity decreases as offset increases. That’s why capacity charts show lower allowable loads with greater offsets. The other choices contradict the basic relationship between offset and the load moment, so they don’t fit with how crane capacities are determined.

When lifting, the amount the crane can safely hoist is limited by the load moment about the base. Offsetting the jib moves the load away from the crane’s centerline, creating a longer lever arm. That larger lever arm means the same weight produces a bigger moment, so the crane must carry less weight to stay within safe limits. So capacity decreases as offset increases. That’s why capacity charts show lower allowable loads with greater offsets. The other choices contradict the basic relationship between offset and the load moment, so they don’t fit with how crane capacities are determined.