NCCER Crane Crane Components, Configurations & Terminology 2

Question 1

On a lattice boom section, the main longitudinal members that run the full length of the section are called:

Accepted Answer

Chords

Answer

Chords are the primary load-carrying members, while lacings are the diagonal braces connecting them.

Question 2

What is the primary purpose of a jib attached to the boom tip?

Accepted Answer

To extend the crane's reach and lifting height

Answer

A jib adds length beyond the boom tip for more reach, usually at a reduced capacity.

Question 3

On a lattice boom crawler crane, the gantry (A-frame) mainly serves to:

Accepted Answer

Raise the boom hoist reeving point to improve leverage for raising the boom

Answer

The gantry raises the boom hoist bridle anchor point, giving better mechanical advantage for luffing the boom.

Question 4

Fixed-length wire ropes or bars that connect the boom tip to the bridle and hold up the boom are called:

Accepted Answer

Pendants

Answer

Pendants are fixed-length supports between the boom point and the bridle or gantry.

Question 5

When outriggers are set correctly on a mobile crane, what should happen?

Accepted Answer

All tires come off the ground and the crane is level

Answer

Fully extended, level outriggers with tires clear of the ground give the rated on-outrigger capacity.

(NCCER Crane) National Center for Construction Education and Research Crane Certification Practice Test