Core TradesCâu 56 / 700
For an excavation made in soft or unstable (Type C) soil, the MAXIMUM allowable slope (horizontal to vertical) is generally:
a.1/2 to 1
b.1-1/2 to 1
c.1/4 to 1
d.3 to 1
Giải thích
Type C soil, being the least stable, must be laid back to a maximum slope of 1-1/2 horizontal to 1 vertical (about 34 degrees). Steeper ratios like 1/2:1 or 1/4:1 are unsafe for Type C, and 3:1 is flatter than required.
Trích dẫn luật: Cal/OSHA Title 8 (Excavations)Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Which field method determines in-place soil density by excavating a small hole and replacing the soil with a calibrated sand from a known-volume cone?
- In soil compaction, the maximum dry density of a soil is achieved when it is compacted at its:
- Under Cal/OSHA rules, a trench that workers enter must be protected by shoring, sloping, or a shield system once its depth reaches at least:
- A driveway rises 3 feet in elevation over a horizontal run of 60 feet. What is its slope expressed as a percent?
- A building pad requires 200 compacted cubic yards of engineered fill. If the borrow soil shrinks about 20 percent when compacted, how many bank (in-place) cubic yards must be excavated from the borrow site?
- A level is set up and a backsight of 5.20 feet is read on a benchmark at elevation 100.00 feet. A foresight of 3.40 feet is then read on a new point. What is the elevation of the new point?
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