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

Longer radius increases hydraulic pressure requirements

Answer

The PTO disengages automatically at maximum radius

Answer

Outrigger pads must be repositioned for each radius change

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

Operating with the engine running at high idle

Answer

Using a two-part line instead of a single-part line

Answer

Exceeding the manufacturer's recommended hydraulic oil temperature by 5°F

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

Estimate capacity based on prior experience and reduce the estimated load by 10%

Answer

Proceed using the nearest available capacity rating from a similar model

Answer

Contact dispatch and perform a reduced-capacity test lift

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

The inner boom raises and lowers vertically while the outer boom rotates the load horizontally

Answer

The inner boom is the main hydraulic cylinder and the outer boom is the structural mast

Answer

The inner boom carries the load block and the outer boom carries the hook and block assembly

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

The total length of the boom in its extended position

Answer

The vertical height from ground level to the boom tip

Answer

The maximum distance the truck can travel with the boom fully raised

Question 6

A service truck crane operator notices that the crane's hydraulic system is producing unusual noise during boom extension. What is the MOST appropriate immediate action?

Accepted Answer

Lower the load to the ground, secure the crane, and shut down for inspection

Answer

Continue the lift while monitoring the noise to see if it worsens

Answer

Switch from high-pressure mode to low-pressure mode and complete the lift

Answer

Increase engine RPM to boost hydraulic flow and overcome the resistance