A crane operator observes that a single-leg synthetic sling is being used in a choker hitch to lift a load. For optimal safety and to maximize the sling's capacity in a choker hitch, what is the recommended minimum angle of choke, relative to the vertical line of the sling?

Question: A crane operator observes that a single-leg synthetic sling is being used in a choker hitch to lift a load. For optimal safety and to maximize the sling's capacity in a choker hitch, what is the recommended minimum angle of choke, relative to the vertical line of the sling?

Answer options:

• 60 degrees
• 90 degrees
• 120 degrees ✅ 150 degrees

Correct answer: 150 degrees

Explanation: For a choker hitch, the tighter the choke angle, the less severe the stress on the sling. A minimum angle of choke of 150 degrees (meaning the angle formed by the sling where it passes around the load, relative to its vertical section) is typically recommended to avoid excessive wear and loss of capacity. Smaller angles (e.g., 90 or 60 degrees) would tightly pinch the sling, leading to greater stress and loss of capacity.