A jib that can be moved during a lift is called a _____.

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

Answer: (A)

Moving the jib during a lift means changing the angle of the jib to raise or lower the load without moving the crane itself. The luffing jib is designed for this capability; it can be raised or lowered by changing its angle, which lets the operator adjust the radius and height of the lift and avoid obstacles or exceed crane capacity. A fixed jib stays rigid and can’t change angle; a swing jib rotates the entire jib around the crane’s base to move the load in a circular path; a telescoping jib changes reach by extending or retracting, not by changing the jib’s angle during the lift. So, the jib that can be moved during a lift is the luffing jib.