10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The CMRS/LD exam has 100 questions and runs 4 hours.
These 10 free CMRS/LD questions are organized by exam domain, so you can see how each part of the Certified Master Rigger and Signaler/Lift Director blueprint is tested. Reveal the answer and explanation under each question.
A rigid 16,000 lb load is supported by two vertical lifting points 8 ft apart. Its center of gravity is 3 ft from the left point. Ignoring rigging weight and dynamic effects, what vertical loads act at the left and right points?
Correct answer: B - Left 10,000 lb; right 6,000 lb
A rigger applies an equal-load two-leg capacity table to an asymmetric lift. The calculated force in the more heavily loaded leg exceeds that leg rating, although total load is below the sum of both vertical ratings. Which conclusion is correct?
Correct answer: B - The higher-loaded leg must be assessed against its actual force and rating
A component specification lists a WLL of 4,000 lb and minimum breaking strength of 20,000 lb. The planned imposed load is 5,000 lb under conditions covered by the WLL. What does the comparison show?
Correct answer: C - The imposed load exceeds the permissible working rating
A symmetric 12,000 lb load is supported by two identical sling legs with equal load sharing. Each leg is at 30 degrees from the horizontal. Ignoring rigging weight and dynamic effects, what is the tension in each leg? Use tension=(load/2)/sin(horizontal angle).
Correct answer: A - 12,000 lb per leg
A sling tag lists vertical WLL 5,000 lb and choker WLL 4,000 lb for the proposed conditions. The planned single choker hitch will carry 4,500 lb. Which assessment is correct?
Correct answer: D - The choker rating is insufficient for the planned load
A wire-rope sling arrives with an unreadable identification tag. Its construction and rated capacity cannot be established, although no obvious broken wires are visible. What is the appropriate disposition before the planned lift?
Correct answer: D - Keep it out of service until legible identification is restored through an authorized process
A below-the-hook device has a marked WLL of 10,000 lb in the planned configuration. The imposed load is 11,000 lb, excluding effects already allowed for in the plan. Which response respects the stated rating?
Correct answer: A - Select a device rated for the imposed load in the intended configuration
During an initial trial lift, the load starts rotating unexpectedly as a sling moves from its planned contact position. What should the lift director direct first?
Correct answer: A - Stop and safely secure or lower the load before reassessing
A selected shackle has adequate in-line WLL, but the proposed connection imposes side loading. The manufacturer's instructions for this model prohibit side loading. Which change is appropriate?
Correct answer: A - Reconfigure the connection to keep loading within the permitted direction
A planned load path crosses a pedestrian aisle. The lift can be routed and controlled so no workers are required in the fall zone. Which plan most directly controls the exposure?
Correct answer: C - Establish and control an exclusion area for the load movement
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