NCCCO Mobile Crane Operator Test 1 4

Question 1

Before a mobile crane operator accepts a lift assignment, the operator MUST verify:

Accepted Answer

The weight of the load and rigging, the pick radius, and the crane configuration capacity

Answer

The operator must confirm that the total load (load + rigging) at the intended radius does not exceed the crane's rated capacity in its configured setup.

Question 2

A crane operator receives conflicting hand signals from two different signalers during a critical lift. The operator should:

Accepted Answer

Stop all movement immediately and do not resume until one designated signaler is identified

Answer

ASME B30.5 and OSHA require that only one designated signaler direct crane operations; conflicting signals require an immediate stop.

Question 3

What is the primary reason a mobile crane's outrigger pads are used?

Accepted Answer

To distribute the outrigger load over a larger ground surface area

Answer

Outrigger pads spread the concentrated point load from the outrigger float over a larger area to prevent ground penetration and crane settlement.

Question 4

A 'critical lift' under NCCCO and ASME B30.5 standards is typically defined as any lift that exceeds what percentage of the crane's rated capacity?

Accepted Answer

75%

Answer

ASME B30.5 defines a critical lift as one that exceeds 75% of the crane's rated capacity or involves other defined risk factors.

Question 5

Which of the following best describes 'two-blocking' on a mobile crane?

Accepted Answer

The upper and lower load blocks making contact, causing potential wire rope failure

Answer

Two-blocking occurs when the hook block contacts the boom tip or upper block, which can snap the wire rope and drop the load.

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

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

NCCCO Mobile Crane Operator Test 1 4