NCCCO Crane Operations & Safety Procedures 5 — Questions and Answers
Question 1: Which condition would require an operator to immediately cease crane operations and remove the crane from service?
- A minor surface rust spot on the boom
- A cracked or deformed load hook (Correct answer)
- Slight discoloration on the wire rope
- A loose cab door hinge
Correct answer: A cracked or deformed load hook
A cracked or deformed hook is a critical deficiency that requires the crane to be immediately removed from service until the hook is replaced.
Question 2: What is the purpose of a load moment indicator (LMI) on a crane?
- To measure the weight of the hook block only
- To provide a real-time warning when approaching rated capacity based on load and radius (Correct answer)
- To replace the need for load charts during operations
- To automatically stop the crane at exactly rated capacity
Correct answer: To provide a real-time warning when approaching rated capacity based on load and radius
An LMI monitors load and radius to warn operators when they approach the crane's rated capacity, but it does not replace operator judgment or load charts.
Question 3: During crane operations, a two-blocking condition occurs when:
- The load block contacts the boom tip or upper block (Correct answer)
- The crane operates at exactly 100% of rated capacity
- Two cranes are working in the same area simultaneously
- The load swings and contacts the crane structure
Correct answer: The load block contacts the boom tip or upper block
Two-blocking occurs when the lower load block is raised until it contacts the upper block or boom tip, potentially causing catastrophic failure of the hoist line.
Question 4: What is the proper procedure when a crane operator is unsure whether ground conditions can support the crane?
- Proceed cautiously and watch for signs of settling
- Consult with the crane's qualified person and obtain a ground bearing capacity assessment (Correct answer)
- Spread crane outriggers as wide as possible and continue
- Reduce the intended load by half and proceed
Correct answer: Consult with the crane's qualified person and obtain a ground bearing capacity assessment
Uncertain ground conditions must be evaluated by a qualified person before operations begin, as ground failure is a leading cause of crane tip-overs.
Question 5: According to NCCCO standards, what must a crane operator have within reach or in their possession while operating a crane?
- The crane's original purchase documentation
- The applicable load charts for the crane configuration being used (Correct answer)
- A copy of the OSHA 1926 Subpart CC regulations
- The crane's complete maintenance history
Correct answer: The applicable load charts for the crane configuration being used
Operators must have access to the applicable load charts for the exact crane configuration being used at all times during operation.
Question 6: When rigging a load for a crane lift, what is the primary purpose of using a tag line?
- To support the weight of the load during the lift
- To control load spin and prevent the load from contacting personnel or structures (Correct answer)
- To connect the load directly to the crane hook
- To measure the distance from the crane to the load
Correct answer: To control load spin and prevent the load from contacting personnel or structures
Tag lines are used by ground personnel to control load rotation and lateral movement, keeping the load from striking workers or obstructions.
Question 7: What is the maximum allowable wind speed at which most cranes can safely operate, as specified in the manufacturer's documentation?
- Wind speed has no effect on crane rated capacity
- Operators must consult the specific crane manufacturer's wind speed limits in the load chart or operator manual (Correct answer)
- All cranes must stop at 30 mph regardless of configuration
- Wind limits only apply to tower cranes, not mobile cranes
Correct answer: Operators must consult the specific crane manufacturer's wind speed limits in the load chart or operator manual
Wind speed limits vary by crane type, configuration, and load, so operators must follow the specific limits stated in the manufacturer's documentation for their equipment.
NCCCO Crane Operations & Safety Procedures 5
Which condition would require an operator to immediately cease crane operations and remove the crane from service?