NCCCO Mobile Crane Operator 4

Question 1

When operating a mobile crane on a slope, the load chart ratings are based on which condition?

Accepted Answer

Level ground within 1% grade

Answer

NCCCO load charts are based on the crane being level within 1% grade; operating on slopes beyond that requires deration.

Question 2

Which document must the operator review before each shift to understand site-specific hazards?

Accepted Answer

The lift director's pre-lift meeting notes or site safety plan

Answer

A pre-lift meeting and site safety plan identify hazards, utilities, ground conditions, and emergency procedures specific to that lift.

Question 3

What is the purpose of a load moment indicator (LMI) on a mobile crane?

Accepted Answer

To provide the operator a continuous warning when approaching or exceeding rated capacity

Answer

An LMI monitors the combination of load and radius and alerts the operator when rated capacity is being approached or exceeded.

Question 4

A mobile crane's maximum rated capacity at a given radius is reduced when the load is handled:

Accepted Answer

Over the side vs. over the front or rear, depending on crane design

Answer

Many mobile cranes have lower rated capacities when lifting over the side compared to front or rear due to structural and stability differences.

Question 5

Before making a pick, the operator must verify ground bearing pressure does NOT exceed:

Accepted Answer

The ground's or mat's bearing capacity at the outrigger pad locations

Answer

Ground bearing capacity at each outrigger pad must be confirmed adequate to prevent settlement or crane tip-over.

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