NCCCO Service Truck Crane Operator Test 1 3 — Questions and Answers
Question 1: When reading a service truck crane load chart, what does the 'working radius' refer to?
- The height of the boom above ground
- The horizontal distance from the crane's rotation axis to the center of the load (Correct answer)
- The maximum safe working load at any angle
- The distance from the outrigger pads to the load
Correct answer: The horizontal distance from the crane's rotation axis to the center of the load
Working radius is the horizontal distance from the axis of crane rotation to the center of the suspended load.
Question 2: Which condition requires an operator to immediately stop crane operations?
- Wind speed reaches 15 mph
- A nearby worker enters the swing radius (Correct answer)
- The load is at 75% of rated capacity
- The boom angle exceeds 45 degrees
Correct answer: A nearby worker enters the swing radius
Operations must stop immediately when any person enters the crane's swing radius to prevent crush injuries.
Question 3: What is the purpose of a anti-two-block device on a service truck crane?
- To prevent the load block from being raised into the boom tip (Correct answer)
- To stop the crane from rotating more than 360 degrees
- To limit the maximum boom extension length
- To prevent overloading the outrigger pads
Correct answer: To prevent the load block from being raised into the boom tip
An anti-two-block device automatically stops hoist travel to prevent the load block from colliding with the boom tip sheaves.
Question 4: When setting outrigger pads on soft or unstable ground, the operator should:
- Reduce the pad size to minimize surface disturbance
- Use cribbing or mats to distribute the load over a larger area (Correct answer)
- Extend outriggers to full extension without pads
- Contact the manufacturer before any lift
Correct answer: Use cribbing or mats to distribute the load over a larger area
Cribbing or crane mats spread the outrigger load over a larger area to prevent sinking or tipping on soft ground.
Question 5: According to ASME B30.22, what is the minimum number of wraps of wire rope that must remain on the hoist drum during operation?
- 1 wrap
- 2 wraps (Correct answer)
- 3 wraps
- 5 wraps
Correct answer: 2 wraps
ASME B30.22 requires at least two wraps of wire rope on the hoist drum at maximum extension to maintain rope retention.
Question 6: A load chart lists a capacity of 4,000 lbs at a 10-foot radius. The operator wants to lift at a 15-foot radius. What should the operator do?
- Use the 4,000 lb capacity since it is close enough
- Refer to the load chart value for the 15-foot radius before lifting (Correct answer)
- Increase boom angle to compensate for the greater radius
- Add counterweights and proceed with the lift
Correct answer: Refer to the load chart value for the 15-foot radius before lifting
Capacity decreases as radius increases, so the operator must always read the load chart at the actual working radius.
Question 7: What does a yellow tag on a sling indicate?
- The sling is certified for overhead lifting
- The sling requires inspection before next use (Correct answer)
- The sling is out of service and must not be used
- The sling rating has been downgraded
Correct answer: The sling requires inspection before next use
A yellow tag on rigging equipment signals that it requires reinspection before being returned to service.
NCCCO Service Truck Crane Operator Test 1 3
When reading a service truck crane load chart, what does the 'working radius' refer to?