Question 379 Deck General

The correct answer is B) decreased. When the boom of a pedestal crane is lengthened, the lifting capacity of the crane is decreased. This is because as the boom length increases, the moment arm (the distance between the load and the crane's center of rotation) also increases. According to basic principles of physics, this increased moment arm results in greater stress on the crane's structural components, requiring a reduction in the maximum allowable load to maintain safe operation. The other answer options are incorrect because: A) increasing the boom length does not increase the lifting capacity, C) the lifting capacity is not eliminated, and D) the lifting capacity is in fact changed, specifically decreased, when the boom length is increased.