SafetyCâu 661 / 700
A competent person classifies excavation soil by unconfined compressive strength. Which value range correctly identifies Type B soil?
a.1.5 tons per square foot or greater
b.Greater than 0.5 but less than 1.5 tons per square foot
c.Less than 0.5 tons per square foot
d.Exactly 0 tons per square foot (running soil only)
Giải thích
Correct: Type B soil has an unconfined compressive strength greater than 0.5 but less than 1.5 tsf. Type A is 1.5 tsf or greater (the most stable cohesive soil), and Type C is less than 0.5 tsf (least stable). A value of exactly 0 does not define a class; classification uses the ranges above along with other factors like layering and water.
Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- 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?
- A single portable ladder is used repeatedly to access an upper landing. Which combination of practices BEST reduces the risk of the ladder shifting or a worker falling?
- 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 contractor wants to use a benched (stepped) excavation wall as the protective system. In which soil is benching NOT permitted?
- CALCULATION: A trench 5 feet deep and 100 feet long requires a means of egress so no worker travels more than 25 feet of lateral distance to reach a ladder. What is the MINIMUM number of ladders needed, spaced so every point is within that distance?
Cập nhật gần nhất: · quy trình kiểm tra
Đội Ngũ Biên Tập PrepPass · Đối chiếu với California CSLB General Building (B) Trade Examination · Quy trình kiểm tra