SafetyCâu 656 / 700
CALCULATION: A portable straight ladder rests against a wall where the top touches the wall 16 feet above the base. To meet the 4:1 pitch rule, about how far out from the wall should the ladder's feet be placed?
a.1 foot
b.2 feet
c.3 feet
d.4 feet
Giải thích
Correct: the 4:1 rule sets horizontal distance = working height / 4 = 16 / 4 = 4 ft. This produces the roughly 75.5-degree angle for safe use. 1, 2, or 3 feet would make the ladder too steep (approaching vertical), increasing the risk of tipping backward as a worker climbs.
Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- CALCULATION: A free-standing supported scaffold has a minimum base width of 5 feet. Using the common 4:1 height-to-base ratio, at what height must the scaffold first be tied, guyed, or braced to the structure to prevent tipping?
- On a large jobsite a scaffold tagging system is used at access points. A worker sees a YELLOW tag on a scaffold. What does this MOST likely indicate?
- A supported scaffold is being erected on graded soil. What is the BEST practice for the scaffold's footing?
- A ladder is stamped 'Type IA.' What MAXIMUM working load (duty rating) does this designation indicate?
- A crew must work near exposed energized electrical conductors. Which ladder choice is BEST for this task?
- A worker sets up a stepladder to reach a ceiling fixture. Which practice is correct?
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