Mobile Crane Operator — Core Knowledge
Load calculations: practice questions
Our Crane Operator bank has 85 questions on this topic. Here are 5 of them with answers; the full mock exam draws from every topic, like the real one.
Question 1
A 16,000 lb load is lifted with a two-leg bridle at 45 degrees from horizontal. About what is the tension in each leg?
- About 11,312 lb
- About 16,000 lb
- About 8,000 lb
Show the answer
A. About 11,312 lb — (16,000 ÷ 2) × 1.414 ≈ 11,312 lb.
Question 2
Chart capacity is 30,250 lb. The hook block weighs 1,250 lb and the rigging 450 lb. What is the heaviest load you may lift?
- 28,550 lb
- 30,250 lb
- 29,000 lb
- 28,050 lb
Show the answer
A. 28,550 lb — 30,250 − 1,250 − 450 = 28,550 lb.
Question 3
Chart capacity is 37,000 lb. The hook block weighs 850 lb and the rigging 300 lb. What is the heaviest load you may lift?
- 37,000 lb
- 35,350 lb
- 35,850 lb
- 36,150 lb
Show the answer
C. 35,850 lb — 37,000 − 850 − 300 = 35,850 lb.
Question 4
The chart says 10,250 lb at 60 ft radius with the jib erected. The block weighs 450 lb and the rigging 300 lb. What is the maximum load?
- 9,500 lb
- 10,700 lb
- 9,800 lb
- 10,250 lb
Show the answer
A. 9,500 lb — 10,250 − 750.
Question 5
A 18,000 lb load is lifted with a two-leg bridle at 60 degrees from horizontal. About what is the tension in each leg?
- About 18,000 lb
- About 10,395 lb
- About 9,000 lb
Show the answer
B. About 10,395 lb — (18,000 ÷ 2) × 1.155 ≈ 10,395 lb.