Question 422 Deck General

The correct answer is D) decreases as the boom is topped to a greater angle. As the boom is topped (raised) to a greater angle, the stress on the heel block decreases. This is because as the boom angle increases, the vertical component of the load force decreases, reducing the stress on the heel block. The other options are incorrect because: A) Closing the head (tip) of the boom actually decreases the stress on the heel block. B) Doubling up the cargo runner does not directly affect the stress on the heel block. C) The thrust stresses on the boom are not the primary factor determining stress on the heel block.