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30 questions from the rigging, signals and crane basics practice test.
10 questions, graded as you go, with the reason for every answer. No sign-up.
A solid concrete block is 6 ft long, 4 ft wide and 2 ft high. Concrete weighs 150 lb per cubic foot. What does the block weigh?
Answer in lb.
7200 lb
Volume = 6 × 4 × 2 = 48 ft³. Weight = 48 × 150 = 7,200 lb.
Reference: Load weight calculation: volume x unit weight
A rectangular steel tank weighs 800 lb empty. Inside it measures 5 ft by 4 ft by 3 ft, and it is full of water at 62.4 lb per cubic foot. What is the total weight to be lifted?
Answer in lb.
4544 lb
Water volume = 5 × 4 × 3 = 60 ft³. Water weight = 60 × 62.4 = 3,744 lb. Total = 3,744 + 800 = 4,544 lb.
Reference: Load weight calculation: volume x unit weight
A bundle holds 40 reinforcing bars, each 20 ft long. The bar weighs 2.67 lb per foot. What does the bundle weigh?
Answer in lb.
2136 lb
Total length = 40 × 20 = 800 ft. Weight = 800 × 2.67 = 2,136 lb.
Reference: Load weight calculation: weight per foot x length