NCCER Crane Crane Components, Configurations & Terminology 5

Question 1

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

Accepted Answer

Anti-two-block device

Answer

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

Question 2

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

Accepted Answer

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

Answer

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

Question 3

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

Accepted Answer

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

Answer

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

Question 4

A house lock (swing lock) is used to:

Accepted Answer

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

Answer

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

Question 5

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

Accepted Answer

Two

Answer

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

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