NCCCO Load Moment Indicators and Safety Devices 5

Question 1

A crane equipped with an LMI is being used on a job site where the LMI is inoperable. Under OSHA 29 CFR 1926.1416, the operator may:

Accepted Answer

Not operate the crane until the LMI is repaired or replaced

Answer

OSHA 1926.1416 classifies a malfunctioning LMI as a safety device defect that must be corrected before the crane is returned to service.

Question 2

What is the primary purpose of a hoist drum rotation indicator on a lattice boom crane?

Accepted Answer

To indicate the approach of a minimum drum wrap (two-block precursor)

Answer

A hoist drum rotation indicator alerts the operator when the rope is nearly fully unspooled, helping prevent losing the minimum required wraps and a potential two-block condition from below.

Question 3

Which statement about LMI accuracy tolerances is correct per industry standards?

Accepted Answer

LMIs are generally required to be accurate within ±5% of actual load

Answer

Industry standards and most manufacturer specifications require LMI systems to be accurate within ±5% of actual load under normal operating conditions.

Question 4

When an LMI is set up for a crane operating in 'free on wheels' mode versus 'on outriggers fully extended', which configuration will show HIGHER rated capacities?

Accepted Answer

On outriggers fully extended, because of the increased stability base

Answer

Operating on fully extended outriggers provides the widest and most stable support base, resulting in significantly higher rated capacities than free-on-wheels operation.

Question 5

A swing brake safety device on a crane is primarily designed to:

Accepted Answer

Hold the upper structure in position against unintended rotation

Answer

The swing brake locks or holds the rotating upper structure (superstructure) to prevent unintended or uncontrolled slewing, especially on slopes or in windy conditions.

NCCCO (National Commission for the Certification of Crane Operators) Practice Test

NCCCO (National Commission for the Certification of Crane Operators) Practice Test

NCCCO Load Moment Indicators and Safety Devices 5