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RIGGING CML MASTERLIST EXAM WITH 30 0 QUESTIONS
AND CORRECT DETAILED SOLUTIONS WITH RATIONALES
LATEST UPDATED VERSION THIS YEAR 2026- 2027
Question 1 What is the primary function of a shackle in a rigging assembly? A) To provide a permanent connection point for welding B) To serve as a removable link to connect various rigging components C) To measure the tension on a sling leg D) To act as a counterweight for unbalanced loads Correct Answer: B Rationale: A shackle is a U-shaped, load-bearing connector with a removable pin or bolt. It serves as a primary, reusable link between rigging components, allowing for quick assembly and disassembly. Question 2 According to ASME B30.26, how often must all rigging hardware in active service undergo a documented periodic inspection?
A) At least once a year B) At least once a month C) At least once every shift D) At least once every 12 months for a documented periodic inspection Correct Answer: D Rationale: ASME B30.26 requires a documented periodic inspection at least annually, with frequent inspections (daily to monthly) based on the severity of service conditions. Question 3 What does the acronym "WLL" stand for in rigging? A) Working Load Limit B) Weight Lifting Leverage C) Wire Load Limit D) Work Lift Level Correct Answer: A Rationale: WLL stands for Working Load Limit, which is the maximum load that a piece of rigging equipment is designed to safely handle under normal service conditions.
D) To attach the load to the crane hook Correct Answer: B Rationale: A tag line is a rope or line attached to a load to guide and control it during lifting, preventing uncontrolled swinging or rotation. Question 6 What is the recommended method for inspecting wire rope slings? A) Visual inspection only B) Visual inspection and feel for broken wires C) Magnetic particle inspection D) X-ray inspection Correct Answer: B Rationale: Wire rope slings should be inspected visually and by feel (running a gloved hand along the rope) to detect broken wires, kinks, corrosion, or other damage.
Question 7 What does "two-blocking" refer to in crane operations? A) Using two blocks to lift a load B) The condition where the hook block contacts the boom tip sheaves C) A rigging configuration with two slings D) A type of crane with two hoist drums Correct Answer: B Rationale: Two-blocking occurs when the lower block (hook block) is pulled up against the upper block at the boom tip, which can damage the crane or cause the wire rope to fail. Question 8 Which of the following is a common cause of rigging failure? A) Using a sling with a damaged eye B) Properly matching the sling to the load C) Inspecting equipment before use D) Using a tag line to control the load Correct Answer: A
A) Shackle B) Thimble C) Hook D) Turnbuckle Correct Answer: B Rationale: A thimble is a metal sleeve inserted into the eye of a wire rope to protect the rope from wear and abrasion when attached to a hook or shackle. Question 11 According to OSHA regulations, who is responsible for inspecting rigging equipment before each use? A) The crane operator B) The rigger C) The supervisor D) The safety officer Correct Answer: B
Rationale: The rigger is responsible for inspecting all rigging equipment before each use to ensure it is in safe working condition. Question 12 What is the primary function of a "spreader bar" in a rigging operation? A) To increase the load capacity of the crane B) To distribute the load across multiple lifting points C) To reduce the risk of sling damage by keeping slings vertical D) To measure the load weight Correct Answer: C Rationale: A spreader bar is used to keep slings vertical and prevent side loading or crushing of the load. Question 13 What type of inspection is typically performed on rigging equipment at least annually? A) Frequent inspection
Question 15 When should a rigging component be removed from service? A) When it shows signs of wear or damage B) When it reaches its rated capacity C) When it is dirty D) When it has been used for more than one year Correct Answer: A Rationale: Rigging components should be removed from service immediately if they show signs of wear, deformation, corrosion, cracks, or other damage. Question 16 What is the recommended method for storing wire rope slings? A) Coiled on the floor B) Hanging on a rack C) Stored in a damp area D) Stored in direct sunlight Correct Answer: B
Rationale: Wire rope slings should be stored hanging on a rack or in a clean, dry area to prevent corrosion, kinking, and damage. Question 17 What does a "red tag" on rigging equipment typically indicate? A) The equipment is ready for use B) The equipment is defective and should not be used C) The equipment needs lubrication D) The equipment is new and unused Correct Answer: B Rationale: A red tag on rigging equipment typically indicates that the equipment is defective, damaged, or has failed inspection and should not be used. Question 18 What type of sling is most resistant to abrasion and cutting? A) Wire rope sling
Question 20 What should a rigger do if they discover a damaged shackle during a pre-use inspection? A) Continue using it if the damage is minor B) Remove it from service and replace it C) Repair it with welding D) Use it only for light loads Correct Answer: B Rationale: Any damaged rigging component must be immediately removed from service and replaced. Question 21 What does the term "D/d ratio" refer to in rigging? A) The ratio of the sling diameter to the load diameter B) The ratio of the load weight to the sling capacity C) The ratio of the bend radius to the sling diameter D) The ratio of the shackle pin diameter to the eye diameter Correct Answer: C
Rationale: The D/d ratio is the ratio of the bend radius (D) to the diameter of the sling (d). A larger D/d ratio reduces stress on the sling. Question 22 What is the purpose of a "turnbuckle" in a rigging system? A) To connect two pieces of rigging hardware B) To adjust the tension in a rigging assembly C) To measure the load weight D) To provide a visual signal for the crane operator Correct Answer: B Rationale: A turnbuckle is a device used to adjust the tension or length of a rigging assembly. Question 23 What is the maximum allowable wear on a wire rope sling before it must be removed from service? A) 10% of the original diameter
Question 25 What is a "clevis" in rigging hardware? A) A type of hook B) A U-shaped connector with a pin that can be attached to a shackle or other component C) A type of sling D) A measuring device Correct Answer: B Rationale: A clevis is a U-shaped connector with a pin that allows it to be attached to a shackle or other rigging component, providing a flexible connection point. Question 26 What is the purpose of a "swivel" in a rigging assembly? A) To increase load capacity B) To allow rotation and prevent twisting of the sling or load C) To measure tension D) To provide a permanent connection Correct Answer: B
Rationale: A swivel allows the load or sling to rotate freely, preventing twisting and reducing stress on the rigging components. Question 27 What is the maximum number of broken wires in one strand of a wire rope sling before it must be removed from service? A) 2 B) 3 C) 5 D) 10 Correct Answer: C Rationale: Wire rope slings should be removed from service when there are 5 or more broken wires in one strand or 10 or more broken wires distributed throughout the rope. Question 28 What is the function of a "sling protector" or "corner protector"?
Question 30 What is the function of a "safety latch" on a hook? A) To increase the hook's capacity B) To prevent the sling or load from disengaging from the hook C) To measure load weight D) To connect the hook to the crane Correct Answer: B Rationale: A safety latch (safety catch) prevents the sling or load from accidentally disengaging from the hook. Question 31 What is the acceptable amount of wear on a shackle pin before it must be removed from service? A) 5% of the original diameter B) 10% of the original diameter C) 15% of the original diameter
D) 20% of the original diameter Correct Answer: B Rationale: A shackle pin should be removed from service when wear exceeds 10% of the original diameter. Question 32 What is the primary difference between a "chain sling" and a "wire rope sling"? A) Chain slings are more flexible B) Chain slings are more resistant to abrasion and heat C) Wire rope slings are more expensive D) There is no difference Correct Answer: B Rationale: Chain slings are more resistant to abrasion, cutting, and heat damage, making them suitable for harsh environments and high-temperature applications.
