Which boom configuration uses extendable sections that telescope to reach longer distances?

• A. Telescoping
• B. Knuckle
• C. Lattice
• D. Fixed

Answer: (A)

Telescoping booms rely on extendable sections that slide into one another, usually moved hydraulically, to lengthen reach. This sliding, nested-tube design is what lets the boom extend far beyond its stowed length, giving the operator the ability to reach distant points without repositioning the base.

Knuckle booms use joints to bend and change angle, not extend in length. Lattice booms are built from a framework of crisscrossed members and can extend by adding sections, but they don’t telescope. Fixed booms have no extendable parts at all.

So, the defining feature for reaching longer distances is the telescoping action of extendable sections.