NCCCO Service Truck Crane Operator 4 4 — Questions and Answers
Question 1: What is the correct response when a service truck crane's anti-two-block device activates?
- Override the device and complete the lift
- Stop all lifting motion and lower the load slightly to relieve the condition (Correct answer)
- Extend the boom further to create clearance
- Increase line speed to pass through the contact zone
Correct answer: Stop all lifting motion and lower the load slightly to relieve the condition
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?
- Boom length
- Working radius
- Operator's body weight (Correct answer)
- Outrigger configuration
Correct answer: Operator's body weight
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?
- It increases the capacity by 41%
- It reduces the capacity by approximately 29% (Correct answer)
- It has no effect on capacity
- It doubles the tension in the sling legs
Correct answer: It reduces the capacity by approximately 29%
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?
- To measure the time required for each lift
- To alert the operator when the crane is approaching or exceeding its rated capacity (Correct answer)
- To calculate the distance between the crane and power lines
- To record the number of cycles completed per shift
Correct answer: To alert the operator when the crane is approaching or exceeding its rated capacity
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?
- 5 feet
- 10 feet (Correct answer)
- 15 feet
- 25 feet
Correct answer: 10 feet
OSHA 29 CFR 1926.1408 and NCCCO guidelines require a minimum 10-foot clearance from energized power lines up to 50 kV.
Question 6: A service truck crane operator notices that the hydraulic oil has a milky appearance. What does this most likely indicate?
- The oil is at its optimal operating temperature
- Water contamination in the hydraulic system (Correct answer)
- The hydraulic oil has been recently changed
- The oil pressure is too low
Correct answer: Water contamination in the hydraulic system
Milky or cloudy hydraulic oil indicates water contamination, which reduces lubrication and can cause corrosion and system failure.
Question 7: When must an operator test all crane controls before beginning a lift with personnel?
- Only when a new operator is being trained
- At the start of every shift and after any repair or adjustment (Correct answer)
- Once per month during scheduled maintenance
- Only when a supervisor requests it
Correct answer: At the start of every shift and after any repair or adjustment
Controls must be tested at the start of each shift and after any repair to verify proper function before any lifting operation.
NCCCO Service Truck Crane Operator 4 4
What is the correct response when a service truck crane's anti-two-block device activates?