Core TradesCâu 11 / 700
Six cylindrical concrete piers are each 18 inches in diameter and 4 feet deep. Approximately how many cubic yards of concrete are needed for all six?
a.About 0.8 cubic yards
b.About 1.2 cubic yards
c.About 1.6 cubic yards
d.About 2.4 cubic yards
Giải thích
Radius = 9 in = 0.75 ft, so each pier = 3.14 x 0.75^2 x 4 = 7.07 ft^3; six piers = 42.4 ft^3; divided by 27 = about 1.6 cubic yards. The other values result from using the diameter as radius or omitting the pier count.
Trích dẫn luật: 2025 CA Building Code (CBC) Chapter 19 (Concrete)Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- For a typical residential interior slab-on-ground, what is a common MINIMUM slab thickness?
- When placing concrete in cold weather, fresh concrete must generally be protected from freezing until it reaches a compressive strength of at least about:
- During hot-weather concreting, plastic shrinkage cracking is BEST prevented by:
- A rectangular slab measures 20 feet by 25 feet and is 5 inches thick. Approximately how many cubic yards of concrete does it require?
- Mechanical vibration of freshly placed concrete is done PRIMARILY to:
- Final troweling or hard floating of a concrete slab should NOT begin until:
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