You are lifting a one-ton weight with a swinging boom. When comparing the stresses on the rig with the boom at 20° to the horizontal to the stresses when the boom is at 60° to the horizontal, which statement is TRUE?

Question

You are lifting a one-ton weight with a swinging boom. When comparing the stresses on the rig with the boom at 20&deg; to the horizontal to the stresses when the boom is at 60&deg; to the horizontal, which statement is TRUE?

Accepted Answer

Option C: The stress on the head block is greater at 60&deg;.. When lifting a fixed weight, a steeper boom angle decreases the tension in the topping lift but increases the direct loading and compressive stress on the head block and heel block due to the geometry of the forces.

You are lifting a one-ton weight with a swinging boom. When comparing the stresses on the rig with the boom at 20&deg; to the horizontal to the stresses when the boom is at 60&deg; to the horizontal, which statement is TRUE?

You are lifting a one-ton weight with a swinging boom. When comparing the stresses on the rig with the boom at 20° to the horizontal to the stresses when the boom is at 60° to the horizontal, which statement is TRUE?