NCCCO Mobile Crane Operator Fundamentals 5

Question 1

A crane operator notices the load line is kinked and has several broken wires. The correct action is to:

Accepted Answer

Remove the rope from service immediately

Answer

Wire rope with kinks or broken wires must be removed from service per ASME B30.5 and OSHA regulations.

Question 2

On a hydraulic telescoping boom crane, 'fly section' refers to:

Accepted Answer

The outermost, fully extended boom section

Answer

The fly section is the tip section of a telescoping boom that extends furthest from the base section.

Question 3

When using a load moment indicator (LMI), the operator should treat it as:

Accepted Answer

A backup device — the operator must also verify conditions manually

Answer

LMI devices are aids that can malfunction; operators must always cross-check with load charts and apply their own judgment.

Question 4

What does 'working radius' mean in crane operation?

Accepted Answer

The horizontal distance from the center of rotation to the center of the load

Answer

Working radius is measured horizontally from the crane's center of rotation (slewing axis) to the plumb line of the load.

Question 5

If ground conditions are soft or uncertain, the operator should:

Accepted Answer

Consult a qualified engineer and increase pad bearing area

Answer

Questionable ground conditions require engineering evaluation and potentially larger pads or ground improvement before any lift proceeds.

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