NCCCO Mobile Crane Operator Fundamentals 4

Question 1

When a mobile crane is traveling on a public road, the boom must typically be:

Accepted Answer

Lowered and secured in the travel position

Answer

During road travel, the boom must be lowered and secured to keep the crane within legal height limits and maintain stability.

Question 2

Which factor is NOT typically considered when selecting outrigger pad size?

Accepted Answer

Color of the pad material

Answer

Pad color is irrelevant; pad size is determined by crane load, outrigger float area, and ground bearing capacity.

Question 3

The term 'two-blocking' refers to:

Accepted Answer

The upper and lower block making contact

Answer

Two-blocking occurs when the lower load block contacts the upper sheave block, which can cause the hoist rope to part.

Question 4

A load chart for a lattice boom crane shows a note 'on outriggers fully extended.' This means:

Accepted Answer

The rated capacities only apply when outriggers are fully extended

Answer

Load chart configurations must be matched exactly; using partially extended outriggers voids the rated capacities shown.

Question 5

What is the primary purpose of a crane's anti-two-block (ATB) device?

Accepted Answer

Automatically stop hoist motion before two-blocking occurs

Answer

The ATB device detects when the load block approaches the boom tip sheaves and automatically cuts power to the hoist before contact occurs.

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