Which term describes a jib that can be adjusted during a lift?

• A. Luffing jib
• B. Fixed jib
• C. Swing jib
• D. Telescoping jib

Answer: (A)

The ability to adjust the jib during a lift is about changing the jib’s angle in the vertical plane while the load is being moved. A luffing jib is designed to be raised or lowered during operation, which changes the radius and height of the load to fit within the crane’s capacity and to clear obstacles. This is what lets the crane adjust its position dynamically as lifting conditions change.

In contrast, a fixed jib stays at one angle and doesn’t change during the lift, a swing jib rotates the jib around the crane to move the load side-to-side without changing its vertical angle, and a telescoping jib changes reach by extending or retracting along its length rather than altering the angle. So, the term that describes a jib that can be adjusted during a lift is luffing jib.