Two-blocking results from
A)insufficient clearance at the rear of the crane cab
B)riding the headache ball
C)hoisting the load too high
D)adding a block (pulley)to the load block to create a mechanical advantage of two.

Question

Quizplus · Accepted Answer

Two-blocking occurs when the lower load block (or hook assembly) is lifted too high and comes into contact with the upper block or boom tip, potentially causing damage or failure of the hoist line or blocks.

Two-Blocking Results from