Crane Components, Configurations & Terminology Flashcards

The device that prevents the hook block from contacting the boom tip is called a(n):

Answer: Anti-two-block device

An anti-two-block device warns or locks out hoist-up, telescope-out, and boom-down functions before contact.

A rated capacity indicator (RCI), also called a load moment indicator (LMI), primarily:

Answer: Warns the operator as the load approaches the crane's rated capacity for the configuration

RCI/LMI systems compare actual load moment against chart capacity and warn or limit functions.

On a lattice boom crane, boom stops are installed to:

Answer: Prevent the boom from being raised too far and tipping back over the cab

Boom stops prevent backward overturning of the boom at high angles or when a load is suddenly released.

A house lock (swing lock) is used to:

Answer: Mechanically lock the upperworks to prevent rotation, such as during travel

The house lock positively secures the upper from swinging when the crane travels or is parked.

Per ASME B30.5, what is the minimum number of full wraps of wire rope that must remain on the hoist drum?

Answer: Two

At least two full wraps must remain on the drum when the hook is at its lowest position.

A grooved wheel that guides and supports wire rope is called a:

Answer: Sheave

Sheaves change rope direction and are found in boom tips and hook blocks.

The auxiliary hoist line, often reeved over a rooster sheave at the boom tip for faster, lighter lifts, is commonly called the:

Answer: Whip line

The whip line is usually a single-part auxiliary line used for quicker, lighter picks.