NCCCO - National Commission for the Certification of Crane Operators Service Truck Crane Operator Test 1

Question 1

When operating a service truck crane, what is the PRIMARY reason an operator must re-check the load chart after extending the boom to a longer radius?

Accepted Answer

Load capacity decreases significantly as the load radius increases

Answer

Crane capacity is inversely related to load radius — as the boom extends outward, the moment arm increases, dramatically reducing the rated lifting capacity. Operators must consult the load chart for the specific radius in use to avoid an overload condition.

Question 2

Which condition would MOST likely cause a service truck crane to overturn during a lift?

Accepted Answer

Lifting a load within rated capacity but with outriggers not fully extended

Answer

Outriggers must be fully extended and properly set before any lift. Partially extended outriggers narrow the crane's stability footprint, reducing the tipping fulcrum and allowing a load — even one within rated capacity — to overturn the vehicle.

Question 3

Before beginning a lift with a service truck crane, what must the operator do if a load chart specific to the current boom configuration is NOT posted in the cab?

Accepted Answer

Refuse the lift until the correct load chart is obtained and posted

Answer

OSHA and ASME B30.22 require that the applicable load chart be available to the operator at all times. Without the correct chart, rated capacity cannot be determined and the lift must not proceed.

Question 4

On a knuckleboom service truck crane, what is the function of the 'inner boom' and 'outer boom' sections?

Accepted Answer

Together they form an articulating arm that can fold and position loads in tight spaces without the crane rotating

Answer

A knuckleboom crane has two boom sections connected by a knuckle joint, allowing the arm to articulate — fold at the joint — to reach over obstacles or place loads in confined areas without requiring full slewing of the crane turret.

Question 5

What does the term 'working radius' refer to when using a service truck crane load chart?

Accepted Answer

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

Answer

Working radius is the horizontal distance measured from the crane's center of rotation (swing center) to the plumb line of the load. This measurement is critical because all rated capacities on the load chart are based on working radius.

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

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

NCCCO - National Commission for the Certification of Crane Operators Service Truck Crane Operator Test 1