SafetyCâu 662 / 700
CALCULATION: A 6-foot-deep trench in Type A soil will be protected by sloping instead of shoring. Type A allows a maximum slope of 3/4 horizontal to 1 vertical (about 53 degrees). Measured from the trench bottom, how far back from the edge (horizontal run on each side) must the top of the slope extend?
a.3 feet
b.6 feet
c.4.5 feet
d.8 feet
Giải thích
Correct: horizontal run = depth x (3/4) = 6 x 0.75 = 4.5 ft on each side. 3 ft and 6 ft do not match the 3/4:1 ratio for Type A; 8 ft would correspond to a flatter slope than required. Sloping calculations multiply the trench depth by the horizontal component of the allowed ratio for that soil type.
Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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