Crane Operator NCCCO Exam Questions & Answers 2026 (11–20)

Question 1

What action should be taken if a crane hook shows a twist of more than 10 degrees from the plane of the unbent shank?

TheoryPractice · Accepted Answer

Remove the hook from service and replace it. ASME B30.10 requires removal from service if a hook is twisted more than 10 degrees from the plane of its unbent shank. Hooks must never be repaired by heating and bending; replacement is required.

Question 2

How often should a crane hook used in normal service be given a periodic (thorough) inspection?

TheoryPractice · Accepted Answer

At least annually, or per the manufacturer's recommended intervals. ASME B30.10 and manufacturer guidance generally require periodic thorough inspections of hooks at least annually for normal service. The frequency may increase for severe service applications.

Question 3

A crane hook with a rated capacity of 10 tons shows a crack indication at the base of the shank after magnetic particle testing. What is the required action?

TheoryPractice · Accepted Answer

Remove the hook permanently from crane service. Any crack indication found by non-destructive testing (NDT) in a hook requires permanent removal from service. Hooks must not be repaired by welding or grinding, as this alters the metallurgy and can hide defects.

Question 4

Where must a mobile crane's load chart be located during crane operations?

TheoryPractice · Accepted Answer

In the operator's cab and accessible to the operator. OSHA 1926.1416(d)(1) requires that the load chart be in the cab of the crane and accessible to the operator. The operator must be able to reference it to ensure rated capacities are not exceeded.

Question 5

A load chart shows a rated capacity of 40,000 lb at a 30-foot radius with the boom at 70 degrees. What does this rating assume regarding outriggers?

TheoryPractice · Accepted Answer

Outriggers fully extended and set on adequate support. Load charts are based on specific configurations. Unless otherwise noted, rated capacities on a mobile crane load chart assume outriggers are fully extended and properly set on adequate blocking or pads, providing full stability.

Question 6

What visual condition on a lattice boom chord member should immediately trigger removal from service?

TheoryPractice · Accepted Answer

Visible bends, cracks, or buckled sections. Visible bending, cracking, or buckling of lattice boom chord members are serious structural defects that can lead to catastrophic collapse. Such conditions require immediate removal from service and engineering evaluation.

Question 7

During inspection of a hydraulic telescoping boom, the operator notices that the boom does not fully retract to its minimum length. What is the most likely cause?

TheoryPractice · Accepted Answer

Hydraulic cylinder seal failure or internal bypass. Inability to fully retract a telescoping boom section is most commonly caused by hydraulic cylinder seal failure, internal bypass, or a bent cylinder rod. This condition must be evaluated by a qualified mechanic before further use.

Question 8

What inspection method is most appropriate for detecting subsurface cracks in a lattice boom chord that show no visible surface indication?

TheoryPractice · Accepted Answer

Magnetic particle testing (MT). Magnetic particle testing (MT) is effective at detecting near-surface and slightly subsurface cracks in ferromagnetic steel boom members. Dye penetrant (PT) finds only surface-breaking defects; radiographic testing is used for volumetric defects; visual inspection cannot detect subsurface flaws.

Question 9

Before crane operations, outrigger pads or mats must be checked to ensure they are:

TheoryPractice · Accepted Answer

Of adequate size and capacity to distribute the outrigger load to the supporting surface. Outrigger pads or mats must be sized and rated to spread the concentrated outrigger load across a sufficient area of the ground to prevent settlement or puncture. The ground bearing capacity and outrigger reaction force must both be considered.

Question 10

During setup, the operator notices that one outrigger cylinder extends but does not hold pressure (slowly sinks under load). The correct action is to:

TheoryPractice · Accepted Answer

Remove the crane from service and repair the cylinder before lifting. An outrigger that sinks under load indicates internal hydraulic cylinder seal failure. This can lead to catastrophic tip-over. The crane must be removed from service until the cylinder is repaired and retested.

Crane Operator NCCCO Exam Questions & Answers 2026 (11–20)

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