Question 290 Deck General
70% to passYou 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?
A
The thrust on the boom is greater at 60°.
B
The stress on the heel block is less at 20°.
C
The stress on the head block is less at 60°.
D
The stress on the topping lift is greater at 60°.
AI Explanation
The correct answer is A) The thrust on the boom is greater at 60°. When the boom is at a 60° angle to the horizontal, the thrust or force acting on the boom is greater compared to when the boom is at a 20° angle. This is because the vertical component of the load's weight increases as the boom angle increases, leading to higher stresses on the boom structure. The other answer choices are incorrect because the stress on the heel block, head block, and topping lift are not necessarily dependent on the boom angle in the way described.
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