The greatest horizontal stress between the heads of the booms in the yard and stay rig occurs when the load is in such a position that the __________.

Correct Answer: Option B — falls are at an equal angle to the horizontal

In a traditional yard and stay (union purchase) rig, the horizontal transfer stress between boom heads reaches its physical maximum when the yard fall and stay fall operate at equal angles to the horizontal, balancing the opposing lateral forces across the span.