NCCCO Service Truck Crane Operator 4 4

Question 1

What is the correct response when a service truck crane's anti-two-block device activates?

Accepted Answer

Stop all lifting motion and lower the load slightly to relieve the condition

Answer

When an anti-two-block device activates, the operator must stop hoisting and lower the load to prevent block-to-block contact and wire rope damage.

Question 2

Which factor is NOT typically listed on a service truck crane load chart?

Accepted Answer

Operator's body weight

Answer

Load charts specify rated capacities based on boom length, working radius, and outrigger configuration, not the operator's personal weight.

Question 3

When securing a load with a wire rope sling at a 45-degree angle from vertical, how does this affect the sling's effective capacity compared to a vertical lift?

Accepted Answer

It reduces the capacity by approximately 29%

Answer

At a 45-degree sling angle from vertical, the sling efficiency factor is approximately 0.707, reducing effective capacity by about 29%.

Question 4

What is the primary purpose of a load moment indicator (LMI) on a service truck crane?

Accepted Answer

To alert the operator when the crane is approaching or exceeding its rated capacity

Answer

The LMI monitors load and radius in real time and provides visual and audible warnings when the crane nears its rated capacity limit.

Question 5

According to NCCCO standards, what minimum distance must a crane maintain from energized power lines rated up to 50 kV?

Accepted Answer

10 feet

Answer

OSHA 29 CFR 1926.1408 and NCCCO guidelines require a minimum 10-foot clearance from energized power lines up to 50 kV.

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

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

NCCCO Service Truck Crane Operator 4 4